CN105906258B

CN105906258B - A kind of concrete for reinforced concrete composite structure C240 strength grades

Info

Publication number: CN105906258B
Application number: CN201610217992.2A
Authority: CN
Inventors: 郑山锁; 董方园; 郑捷; 王斌; 王帆; 张艺欣; 秦卿; 杨威; 李磊; 孙龙飞; 左河山; 石磊; 郑淏; 张晓辉; 周炎
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2017-09-19
Anticipated expiration: 2036-04-08
Also published as: CN105906258A

Abstract

The invention discloses a kind of concrete for reinforced concrete composite structure C240 strength grades, match and be：Cement: fine aggregate: coarse aggregate: water: water reducer: defoamer：Silica flour: flyash：Exciting agent：Swelling agent：Compound plasticity-maintaining agent=500: 760: 1293: 101: 20.2: 1.4: 97: 123: 10.5: 51: 0.60.Preparation method is：First water reducer, exciting agent and compound plasticity-maintaining agent are uniformly admixed and mixture obtained in water, is mixed thoroughly by weight fine aggregate and the 1/3 of amount of the mixture is sequentially added in mixer；Add coarse aggregate and amount of the mixture 1/3 is mixed thoroughly；Cement, swelling agent, silicon ash and flyash is added to mix thoroughly；Defoamer and remaining mixture are added, is stirred, discharging.The concrete can significantly improve the adhesive property between shaped steel and concrete in its natural state, effectively play steel and concrete each mechanical property and mutual cooperative work performance, the significantly bearing capacity of lift structure component and performance and durability, with good high volume stability and economy.

Description

A kind of concrete for reinforced concrete composite structure C240 strength grades

Technical field

The invention belongs to building material technical field, be related to one kind is for reinforced concrete composite structure strength grade C240 special high-strength high-performance concrete.

Background technology

The invention of Portland cement in 1824 makes concrete technology obtain rapid development, and its consumption is big, is applicable model That encloses may extensively occupy the first in the world.Although concrete is a kind of traditional manufactured construction materials, because it is excellent with what is do not replaced The more continuous progress of property (the advantages of abundant raw material, simple production process, high cost performance) and concrete material science and technology, Concrete turns into the main body of civil engineering material, also will be indispensable master in following civil engineering and nation-building One of material.Meanwhile, with the continuous expansion of city size, population is on the increase, the continuous rise of land price, builds local environment Harshization, the continuous progress and rapid development of economy of Building technology, building increasingly prolongs into aerial, underground and water Stretch, that is, build super/extra-highization, super/Super-Long Span, underground, lightweight and the development of heavy type structure, especially steel reinforced concrete Structure is at super/extra-highization, super/Super-Long Span, underground, sea or change, lightweight etc. under water is novel or megaplex engineering is led The application in domain, requirement to this construction material of concrete also more and more higher.Therefore, super/extra-high reinforcing of concrete and super/spy The research of durableization and put into practice the development trend as the field.

Reinforced concrete composite structure (abbreviation SRC structures) is a kind of principal mode of steel-concrete combined structure, by In its bearing capacity is high, rigidity is big, ductility is good, anti-seismic performance is superior, fire retardant anticorrosion, be easy to the series of advantages such as construction, by Be applied to more and more widely it is big across, heavy type structure, underground, under water or marine engineering and earthquake/typhoon zone it is high-rise and super/special Skyscraper.Compared with steel construction, SRC structures can save great deal of steel, strengthen section rigidity, overcome steel structure fire-resistant, resistance to The shortcomings of corrosivity and poor durability and easy flexing unstability, the ability of steel is set to fully play；With regular reinforcement coagulation Soil structure (abbreviation reinforced concrete structure) is compared, and reinforced concrete composite structure can reduce the sectional dimension of component, reduces shared space, Space is used so as to increase building；In construction, the steel skeleton of steel reinforced concrete structure can hang mould, sliding formwork as concrete in itself Skeleton, not only enormously simplify formwork engineering, be also subject to whole construction loads (including hang, sliding formwork and institute's pouring concrete) Supporting system；Further, since SRC structures have globality strong, the advantages of good working ductility, can substantially improve armored concrete by Break bad brittleness, the anti-seismic performance of structure is significantly improved, bearing capacity and ductility than reinforced concrete structure have compared with Big raising.Therefore, in the developed country such as Japan and America and Europe, the SRC structures with good anti-seismic performance have turned into a kind of and generally acknowledged Novel earthquake-proof structural system, and with steel construction, timber structure, reinforced concrete structure and referred to as four big structures.China is also one Individual many earthquake countries, most areas are earthquake territory, partly positioned at highlight lines and frequently occurred earthquake area, are promoted in these areas SRC structures just have very important realistic meaning；On the other hand, because the rapid growth of population makes housing need amount also not It is disconnected to increase, and land resource scarcity is valuable, and then building is promoted to the development of more high spatial, therefore advised in economic condition and city Drawing super/special skyscraper of construction under conditions of allowing also turns into the effective measures in saving fund and saving soil.Therefore, SRC is tied Structure has boundless application prospect in China, continuous enhancing and super/special high-strength steel especially with China's economic strength Successful development and application with special high-strength high-performance concrete (they are putative 21 century materials), will be greatly facilitated this The popularization and application and progress of structural system.There are some researches prove the intensity of special high-strength high-performance concrete is higher, its fragility It will increase, ductility also can be poor, under high stress or complex stress condition, special high-strength high-performance concrete component will be by fragility Control destructive process, the reliability reduction of work.But, this new High Technique Concrete is applied in steel reinforced concrete group Close in structure (abbreviation SRC structures), i.e. the special high-strength high-performance concrete combining structure (abbreviation SRUSUPC structures) of shaped steel, can be with Maximize favourable factors and minimize unfavourable ones, overcome big special high-strength high-performance concrete fragility, poor ductility and shaped steel fire resisting, the weakness of poor corrosion resistance, make Its superior function and economic benefit are given full play to.

In SRC structures, good cementation is to ensure that SRC components Shaped Steel is assisted with concrete between shaped steel and concrete The basis of work is adjusted, shaped steel, three kinds of material elements of reinforcing bar and concrete cooperate, can to resist various action effects Give full play to its advantage.But one of SRC structures and the significant difference of reinforced concrete structure are that the cohesive force between shaped steel and concrete is remote Much smaller than the cohesive force between reinforcing bar and concrete, the cohesive force of shaped steel and normal concrete is only about viscous equivalent to plain steel-bar Tie the 45% of power.Domestic and international many experimental studies show, bond-slip phenomenon is there is between shaped steel and concrete, and right The stress performance or even bearing capacity of SRC components have a significant impact.Therefore, how to ensure that shaped steel effectively cooperates with work with concrete It is made for one of emphasis of SRC structural researches.At present, to the place of bond-slip problem between shaped steel and concrete in engineering design Reason method typically has two kinds：One is adding a number of shearing connecting piece in component surface by calculating, it certainly will so make Into the inconvenience in construction and cost is improved, and easily cause the defects such as the congenital microcrack of inside concrete；The second is be not provided with or A small amount of shearing connecting piece is only set, the influence of bond-slip, the carrying energy of corresponding reduction component are considered in bearing capacity calculating Power, so certainly exists uneconomic factor.On the other hand, generally existing focuses on intensity and light durable in Structural Design Property phenomenon, the problem of having occurred both at home and abroad in terms of many concrete structures security in use and durability. Some concrete structure engineerings are being complete due to reasons such as alkali-aggregate reaction, Chloride Attacks using not enough design period half Complete lose uses function or even bearing capacity, and indivedual engineerings even partial collapse or total Collapse occur, cause casualties or Architectural Equipment is destroyed.Therefore, in SRUSUPC structures, the natural caking property between shaped steel and special high-strength high-performance concrete is improved Can, it is not provided with shaped steel surface or only sets a small amount of shearing connecting piece to ensure that shaped steel and special high-strength and high performance by detailing requiments The research that concrete effectively cooperates is significant；Meanwhile, the durability of concrete structure engineering also increasingly causes The close attention and great attention of people, and turn into the problem of divination by means of the milfoil is to be solved.

The strength grade that prior art is used for the concrete of reinforced concrete composite structure has C30, C35, C40, C45, C50 And C55 low-strength HPC, C60, C70, C80, C90 and C100 high-strength high-performance concrete and C110, C120, C130, C140 and C150 super high strength high performance concrete, also follow-up C160, C170, C180, C190 and C200's is super/special The technology of preparing of high-strength high-performance concrete, above-mentioned each strength grade concrete significantly improves shaped steel and (super) high-strength concrete Between adhesive property, and improve the durability of structure；But, also presence can not thereby extend into the extra-high strong of higher intensity High performance concrete, and can not be solved when using it for reinforced concrete composite structure shaped steel and special high-strength high-performance concrete it Between natural adhesive property it is poor the problem of, therefore civil engineering work can not be met and extended into aerial, underground and water, that is, built Super/extra-highization, surpasses/Super-Long Span, underground, sea or changes under water, super-durable and heavy, huge and novel Structural Engineering etc. Using and develop the requirement of this trend.In addition, there is also part that super/extra-high reinforcing of concrete, super/spy is resistance in the prior art The technology of preparing changed long, but they are not directed to or not solved shaped steel and special high-strength high-performance concrete during for SRC structures Between natural adhesive property it is poor the problem of.

The content of the invention

It is an object of the invention to provide a kind of for extra-high strong height of the reinforced concrete composite structure strength grade for C240 Performance concrete.The concrete is applied in reinforced concrete composite structure, can (that is, shaped steel surface is not provided with nature Or a small amount of shearing connecting piece only is set by detailing requiments) under significantly improve adhesive property between shaped steel and concrete, effectively hair Steel and two kinds of respective mechanical properties of material of concrete and mutual cooperative work performance are waved, so that significantly lift structure component Bearing capacity and performance；In addition, the concrete can improve the durability of structure, and with good service behaviour, Gao Ti Product stability and economy.

In order to solve the above technical problems, what the present invention was realized in：

A kind of concrete for reinforced concrete composite structure C240 strength grades, the match ratio of the concrete is (single Position：kg/m³)：

Cement: fine aggregate: coarse aggregate: water: water reducer: defoamer：Silica flour: flyash：Exciting agent：Swelling agent：It is compound to protect Modeling agent=500: 760: 1293: 101: 20.2: 1.4: 97: 123: 10.5: 51: 0.60.

Described cement selects the higher 62.5R portland cements of P I of steady quality, better performances, intensity, before use Compatibility test between the two need to be carried out with poly carboxylic acid series concrete high-performance water reducing agent, test method uses existing building materials row Industry standard《Cement and water reducer compatibility test method》Method in JC/T 1083-2008, and select and polycarboxylic-acid coagulation The good cement type of native high-performance water reducing agent compatibility.Selected cement performance index (including fineness, SO₃Content, content of MgO, just Solidifying time, final setting time, 3 days intensity, 28 days intensity) requirement of national existing relevant criterion should be not less than, and select alkali content Less, the heat of hydration is low, water requiremen also low cement type.

Described fine aggregate uses mass ratio for 8:2 particle is round and smooth, quality is hard, level with partially thick river sand in good and Quality is consummate, level matches somebody with somebody good quartz sand.Wherein, the quality of sand should be not less than existing building material industry standard《Normal concrete is used Sand, stone quality and test method standard》JC/T 52-2006 and national standard《Building sand》Advised in GB/T 14684-2011 Fixed high-quality sand standard.Its modulus of fineness be 2.8~3.2 between, clay content and clod content should be not more than 0.3% (with quality Meter), chloride ion content should be not more than 0.02% (in terms of the quality of dry sand), SO₃Content should be not more than 0.5%.Two in quartz sand Silica content should be not less than 99%, and ferric oxide content should be not more than 0.005%, and the metals content impurity such as chromium, titanium should not More than 0.01%.

The coarse aggregate uses that quality densification is hard, intensity is high, rough surface, particle shape is almost spherical, elongated particles Small, level, using basalt, granite as the artificial rubble of main component, is thrown with good according to 5~Φ of continuous size fraction rubble Φ 10 Material；The quality of rubble should be not less than existing building material industry standard《Regular concrete sand, stone quality and test method standard》JC/ T52-2006 and《Cobble for building, rubble》The regulation requirement of the relevant criterions such as GB/T 14685-2011.Its parent of coarse aggregate The cubic compressive strength of rock should be not less than 290MPa, and maximum particle diameter should be controlled in 10mm；By quality ratio, its SO₃Content 0.5% should be not more than, clay content should be not more than 0.2%, and clod content should be not more than 0.1%, and pin, sheet-like particle content should be little In 0.5%, and weathering particle must not be mixed into.When carrying out the Concrete, fed intake using 5~Φ of continuous size fraction rubble Φ 10.

By a large amount of tentative contrast tests and with cement compatibility test, the high efficiency water reducing agent selected by the invention is poly- Carboxylic serials concrete high-performance water reducer, its quality should be not less than existing national standards《Technical code for application of admixture in concrete》 GB50119-2013 and《Concrete admixture》The regulation requirement of the relevant criterions such as GB 8076-2008, selected high efficiency water reducing agent Water-reducing rate should be greater than 30%.The maximum saturation volume of selected high efficiency water reducing agent is not less than whole binder total amounts 2.5%, using with mixing method, and using preceding needing and selected cement type carries out compatibility test.

The defoamer selects AGITAN@P803 powder defoamers.

Described silica flour uses mass ratio for 3:2 30nm nano silica fumes and sub-micro silica flour, its quality should be not less than country Standard《Mineral admixture for high-strength high-performance concrete》The regulation requirement of the relevant criterions such as GB/T 18736-2002, meanwhile, The moisture content of 30nm nano silica fumes and (Asia) SILICA FUME all should be not more than 1%, and loss on ignition all should be not more than 3%, chloride ion content 0.01% all should be not more than, pozzolanic activity index should be greater than 95%.Wherein, the specific surface area of 30nm nano silica fumes should not be small In 40000m²/ kg, silicone content should be not less than 99.9%；The specific surface area of (Asia) micron silica flour should be not less than 25000m²/ kg, two Silica content should be not less than 95%.

The special fine powdered coal of I grade of high-quality that described flyash is produced using the advanced power plant of coal burning process.Its quality should not Less than national standard《For the flyash in cement and concrete》The regulation requirement of the relevant criterions such as GB/T 1596-2005, And its fineness (0.045mm square hole screens are tailed over, %) should be not more than 10%, loss on ignition should be not more than 3%, SO₃Content should be not more than 2%, water content should be not more than 1%, and water demand ratio should be not more than 95%, and specific surface area should be greater than 700m²/kg。

Described exciting agent is, by the efficient flyash excitant (FAEA) of research team's independent development where inventor, to be somebody's turn to do Exciting agent is further excited to the activity of the Ultrafine Grinding pulverized burned coal ash hydration reaction mixed with nano silica fume and sub-micro silica flour, and it is pressed Compound it is formulated according to the raw material of following mass percent meters：

The waterglass of inorganic material 65%~73% (is adjusted in proportion using solid sheet NaOH and commercially available sodium silicate water glass The waterglass that modulus is about 1.0 is made), 23%~30% common dihydrate gypsum (CaSO₄·2H₂) and organic material 3%~5% O Triethanolamine (TEA) is compound to be formulated.

Preparation method is as follows：Certain density alkaline solution, Ran Houhe is made by solid sheet NaOH is soluble in water first The sodium silicate water glass (between the modulus general 2.4~3.3 of commercial water glass) of known modulus is modulated into the experiment that modulus is 1.0 The waterglass needed, finally turns into required composite exciting agent (FAEA) with compound prepare of common dihydrate gypsum and TEA again.

Determined through experiment, the exciting agent has good with early strength silicate cement, poly carboxylic acid series concrete high-performance water reducing agent Good compatibility.

The swelling agent selects the calcium sulphoaluminate class high-efficiency expanding agent for being applied to special high-strength high-performance concrete, and its quality should It is not less than national standard《Cement expansive material》The regulation requirement of the relevant criterions such as GB23439-2009, and its fineness (0.08mm Square hole screen is tailed over, %) 10% should be not more than, specific surface area should be greater than 300m²/ kg, limited expansion rate (in water 7 days) should be not less than 0.05%, 28d compression strength should be not less than 50MPa, and content of MgO should be not more than 3%, and alkali content should be not more than 0.5%.

The compound plasticity-maintaining agent selects the composite highly effective plasticity-maintaining agent for being applied to special high-strength high-performance concrete, the plasticity-maintaining agent bag Include the raw material of following mass ratioes：

Concrete plasticity-maintaining agent 5%~15%；Hydroxycarboxylic acid salt retarder 45%~55%；Macromolecule economization agent 35%~ 40%；

The concrete plasticity-maintaining agent is the stable market of the property for having preferable compatibility with poly- hydroxy acid series high-efficiency water-reducing agent The plasticity-maintaining agent of sale；

The hydroxycarboxylic acid salt retarder is one in sodium gluconate, sodium potassium tartrate tetrahydrate, sodium citrate, sodium salicylate Kind；

The macromolecule economization agent is the comb polymer containing polyoxyalkylene chain, poly- containing polyethers and aliphatic category organic matter One kind in the copolymer of compound, based polyalcohol containing methyl ether/methyl ether based polyalcohol；

The comb polymer containing polyoxyalkylene chain is what Jiangsu Subotexin Material Co., Ltd developed JM-SRA series concrete economization agents, its main component is alkyl polyoxyethylene ether；

The polymer containing polyethers and aliphatic category organic matter is the JSJ types decrement that Metallurgical Research Institute, Department of Architecture is developed Agent, its main component is polyethers and aliphatic category organic matter；

The copolymer of the based polyalcohol containing methyl ether/methyl ether based polyalcohol is developed for the institute of civil engineering of Zhejiang University ZZD-A type economization agents, its main component is methyl ether based polyalcohol and methyl ether based polyalcohol.

By a large amount of tentative contrast tests and with cement compatibility test, the plasticity-maintaining agent and portland cement and the present invention High-performance water reducing agent used has good compatibility.Its quality should be not less than existing national standards《Concrete admixture should Use technical specification》The regulation of the relevant criterions such as GB50119-2013.

Described mixing water selects running water, and its quality should be not less than nation-building ministerial standard《Concrete water standard》 The regulation requirement of the relevant criterions such as JGJ63-2006, and require that the alkali content of selected running water is not more than 1000mg/L.

The present invention gives the preparation method of the concrete for reinforced concrete composite structure C240 strength grades, should Method wraps up in sandstone method concrete stirring technology using improved cement, and concrete technology step is as follows：

1) first by water reducer 20.2kg/m³, exciting agent 10.5kg/m³With compound plasticity-maintaining agent 0.60kg/m³Uniformly admix weighing Good water 101kg/m³In, obtain mixture；

2) 608kg/m and then according to weight proportion is added in forced mixer³River sand, 152kg/m³Quartz sand With step 1) amount of the mixture 1/3,1~2min of uniform stirring；

3) 1293kg/m is added³The continuous size fraction rubble coarse aggregates of 5~Φ of Φ 10 and step 1) amount of the mixture 1/ 3,2~4min of uniform stirring；

4) whole cementing materials are subsequently added into：500kg/m³Cement, 51kg/m³Swelling agent, 58.2kg/m³Nanometer Silica flour, 38.8kg/m³Sub-micro silica flour and 123kg/m³Flyash, 3~4min of uniform stirring；

5) it is eventually adding 1.4kg/m³Defoamer and remaining step 1) mixture, 2~3min of uniform stirring, stop 3 points 2~3min is stirred for after clock to uniform, discharging, the concrete mix of C240 strength grades is produced.

The preparation be used for reinforced concrete composite structure strength grade be C240 concrete mix, its maintenance side Method uses the steam curing in heating curing, and its maintenance flow is：It is quiet stop (4~6 hours) → heating heating (programming rate is every 10 DEG C of hour) → heated at constant temperature (relative humidity is more than 95%, 80 DEG C~90 DEG C, 48~72 hours) → (cooling is fast for cooling heating Spend for 10 DEG C per hour) → standard curing is to 28 days.

The beneficial effects of the invention are as follows：

1. concrete produced by the invention is a kind of suitable for spy of the reinforced concrete composite structure strength grade for C240 High-strength high-performance concrete.The concrete is in the mechanical property (i.e. C240 strength grades, plasticity etc.) that can ensure that it should possess And with high-durability, high workability, high volume stability and economy on the basis of, be significantly improved the concrete and type Natural adhesive property between steel, makes it apply in steel reinforced concrete structure design without (or only needing a little by detailing requiments Ground) add shearing connecting piece on shaped steel surface, you can ensure effective collaborative work of shaped steel and the concrete, applied so as to reduce Work process, has saved steel, improves efficiency of construction, and avoids shearing connecting piece is largely set on shaped steel surface and is easily caused The defects such as the congenital microcrack of the inside concrete, with significant economic benefit and construction quality improvement effect, its mechanical property Energy comparative test result is shown in Table 4.

(2. water-reducing rate should be greater than the high efficiency water reducing agent selection poly carboxylic acid series concrete high-performance water reducing agent used in the present invention 30%), compared to other types of water reducer, the compatibility with early strength silicate cement is good, and it is free of Na₂SO₄, can be further Improve the durability of the concrete.

3. the defoamer selection powder defoamer used in the present invention, model AGITAN@P803 can be stirred to concrete During formed and a large amount of microvesicles in concrete remained on after vibration compacting and carry out deaeration, effectively improve its compactness, Enhance the durability and shear stability of concrete.

4. the composite exciting agent used in the present invention selects the alkaline composite exciting agent (FAEA) of independent development, calcium can be promoted The generation of aluminite, makes have certain micro-expansibility mixed with the concrete of flyash and silicon ash, improves the shrinkage of concrete. By composite exciting agent by flyash watch crystal body network structure depolymerization, so as to excite the lateral reactivity of flyash, Ke Yizeng Using aluminosilicate as the corrosiveness of the three-D space structure vitreum of main aquation component in strength fly-ash hydro-combination process, improve The power of positive hydration reaction, generates the crystal such as more C-S-H gels, drated calcium aluminate and hydrated calcium silicate, promotes fine coal Ash participates in early hydration process, makes full use of the seam between flyash activity micro aggregates and ball effect and silicon ash filler particles Gap, improves the performance of cementing material and reduces water consumption, and secondary hydration product fill concrete internal voids, to being prepared Early strength, later strength and the corrosion resistance of concrete increase significantly；On the other hand, the effect of composite exciting agent promotees Entered the formation of silicon ash-fly ash based mineral polymer, improve concrete durability while also significantly improve shaped steel with Adhesive property between special high-strength high-performance concrete.

5. produced by the invention is logical for C240 high performance concrete for reinforced concrete composite structure strength grade Addition active mineral additives (special fine powdered coal, nano silica fume and sub-micro silica flour) are crossed, part of cement is replaced using equivalent method of substitution, Improve effect and hydration heat of concrete using the pozzolanic reaction of active mineral admixture, enhancement effect, filing effect, durability Warm peak subtractive effect, and make full use of the compound incorporation of active mineral admixture and active mineral admixture and high efficiency water reducing agent Over-superimposed effect produced by composite blend, according to them and cement granules, coarse-fine aggregate particle diameter not the characteristics of same one-level The grain composition of binder materials part in optimised coagulation soil material, flyash and silicon ash can the intergranular hole of filling concrete, The pore structure of interfacial structure and Behavior of Hardened Cement Paste between Behavior of Hardened Cement Paste of not only making to gather materials in concrete is greatly improved, and is carried The high consistency of Behavior of Hardened Cement Paste, impermeability, while typical compact texture can expand to aggregate surface, so that concrete is more Closely knit hard, mechanical property (adhesive property especially between shaped steel), endurance quality and the service behaviour of concrete have Very big raising.

6. the nano silica fume used in the present invention, is a kind of nontoxic, tasteless, pollution-free, high-purity, the nanometer material of free from admixture Material.The particle size of nano silica fume is small, and specific surface area is big, can give full play to its micro-packing effect；Nano silica fume surface is present The hydrogen-based of a large amount of unsaturation residual bonds and different bond styles, or be the silica structure for deviateing stable state because of anoxic, it can consume With refinement Ca (OH)₂Crystal, promotes hydration rate and degree of hydration, makes the hydrated calcium silicate gel to be formed finer and close；Compare In (Asia) SILICA FUME, with higher activity (particularly induced activity) and free energy state, the improvement to concrete microstructure Raising (i.e. C240 strength grades, plasticity etc.) with mechanical property has no small facilitation, while to improving shaped steel and spy Adhesive property between high-strength high-performance concrete also generates remarkable result.

7. the appropriate flyash of present invention admixture can improve mobility, cohesiveness and water-retaining property that concrete mixes and stirs material, But flyash replaces part of cement to reduce the early strength of concrete to a certain extent, and mixes appropriate silicon ash, can show The intensity and durability for improving concrete are write, and can occur secondary reaction of hydration with hydrolysis product of cement Ca (OH) 2, glue is formed Solidifying product, filling concrete stone structure improves the microstructure of slurry, improves the mechanical property and durability of hardenite.Flyash With being used in conjunction with for silicon ash, concrete substrate compactness can be improved, so as to improve the caking property between shaped steel and concrete Energy.

8. the swelling agent used in the present invention, is a kind of calcium sulphoaluminate class concrete high-efficiency expanding agent.Calcium sulphoaluminate class is mixed Solidifying soil high-efficiency expanding agent and hydrate generation entringite expansion hyrate crystal (C₃A·3CaSO₄·32H₂O), it can prevent or subtract Volume contraction cracking in few concrete hydrating, hardening caused by chemical reaction, physical reactions and thermodynamical reaction is compensated, And can fill, block various capillary slits and make concrete inner structure finer and close, not only substantially increase the cracking resistance of concrete Barrier performance and volume stability, and the density and intensity of concrete can be made to be further improved.

9. the plasticity-maintaining agent used in the present invention is one kind by concrete high-efficiency plasticity-maintaining agent, inorganic acid salt retarder, high score The compound composite highly effective plasticity-maintaining agent being formulated of sub- economization agent.The efficient plasticity-maintaining agent can effectively slow down cement in appropriate admixture The aquation of grain, therefore with high slump holding capacity, and the early-age shrinkage rate of special high-strength high-performance concrete is decreased, The crack resistance of concrete is favorably improved, so as to enhance the durability of concrete；In the collective effect with high-performance water reducing agent Under, the relatively low shortcoming of the early strength of concrete can not only be improved, moreover it is possible to significantly improve type steel performance Mechanical property (adhesive property between plasticity, compression strength, shaped steel and concrete etc.).

10. the quartz sand used in the present invention is a kind of hard, wear-resisting, stable chemical performance silicate mineral.It is led It is silica to want mineralogical composition, with certain acid-resisting erosion medium resistance ability, it is possible to which it is inert material to make up river sand Shortcoming participates in hydration reaction and reduces the heat of hydration, improves the durability and intensity of concrete.

11. it is produced by the invention for special high-strength and high performance coagulation of the reinforced concrete composite structure strength grade for C240 Soil is to reduce cement granules, additive particle and superfine active ore deposit under normal concrete manufacturing condition, and using trying one's best What the feeding method that the cement that composition granule is flown upward everywhere when concrete is stirred wraps up in sandstone stirring technique was realized, preparation technology is simple And be easily achieved, it is suitable for engineering and industrialization, is easy to large-scale promotion application, with preferable social benefit.

12. it is produced by the invention for special high-strength and high performance coagulation of the reinforced concrete composite structure strength grade for C240 Contain substantial amounts of flyash, silica flour in the raw material of soil, they are industrial waste and discarded object, and it, which is dissolved, to be done to environmental protection Go out tremendous contribution, meet the requirement of sustainable development, be a kind of green concrete, a kind of environment-friendly material.

13. the raw material (including industrial waste) that the present invention is selected are a large amount of, market circulation of large-scale production, buy and sell production Product, raw material are easy to get.

14. the steam heating curing employed in the present invention can accelerate cement and active mineral admixture hydration reaction The performance of process and volcano ash effect, can improve concrete microstructure, improve its interfacial adhesion and intensity.In addition, mixed The steam heating curing technology of solidifying soil or concrete component was already ripe, and easily grasped, and was established for the popularization and application of the invention Basis.

15. it is produced by the invention for special high-strength and high performance coagulation of the reinforced concrete composite structure strength grade for C240 Soil is to expect (superfined flyash and Ultrafine Grinding silica flour) disastrously by adding superfine active mineral, and part water is replaced using equivalent method of substitution Mud, effect and extra-high strong height are improved using the pozzolanic reaction of active mineral admixture, enhancement effect, filing effect, durability The warm peak subtractive effect of the performance concrete heat of hydration, and make full use of the compound incorporation of active mineral admixture and active mineral to blend Material and the over-superimposed effect produced by the composite blend of high efficiency water reducing agent, according to them and cement granules, coarse-fine aggregate particle diameter Do not optimize the grain composition of binder materials part in extra-high strong high-performance concrete material the characteristics of same one-level, match herein In, aggregate accounting about 75% suitably reduces sand coarse aggregate ratio, that is, improves rubble accounting；Not only make in special high-strength high-performance concrete The interfacial structure between Behavior of Hardened Cement Paste of gathering materials and the pore structure of Behavior of Hardened Cement Paste are greatly improved, and improve the cause of Behavior of Hardened Cement Paste Density, impermeability, while typical compact texture can expand to aggregate surface, so that special high-strength high-performance concrete is more encrypted Real hard, mechanical property (adhesive property especially between shaped steel), endurance quality and the work of special high-strength high-performance concrete Make performance to improve a lot.

The present invention is so that in nature, (that is, shaped steel surface is not provided with or only sets a small amount of shearing to connect by detailing requiments Part) under significantly improve adhesive property between shaped steel and concrete, effectively play steel and two kinds of respective mechanics of material of concrete With cooperative work performance, so that the significantly bearing capacity and performance of lift structure component, and it is ancestor to improve the durability of structure Purport, to study the technology of preparing for reinforced concrete composite structure strength grade for C240 special high-strength high-performance concrete. At present, the quality and intensity more and more higher of the portland cement used in special high-strength high-performance concrete, work used are made both at home and abroad The process technology and quality of property mineral admixture (silica flour, flyash etc.) are updated, in addition high-performance water reducing agent, efficient expansion The research of the concrete admixtures such as agent, efficient plasticity-maintaining agent has achieved larger progress, and defoamer and exciting agent with application Research in concrete is also just progressively developing with application, so that the realization for the studies above objective identifies basis.Meanwhile, it is special The cement consumption of the requirement of high-strength high-performance concrete is relatively fewer, and producing cement means a large amount of rows of carbon dioxide Put, therefore alleviate the greenhouse effects caused to the earth to a certain extent；It requires to have sufficient amount and accounts for cementing material proportion The active mineral additives of the high-quality such as larger flyash, silica flour, it is meant that the reasonable treatment and use of industrial waste, are beneficial to shape Into good production cycle and environmental protection, and the active mineral additives of these high-quality exactly improve concrete material self performance Required.In a word, cement can be saved using special high-strength high-performance concrete, industrial waste is turned waste into wealth, extending structure Engineering service life, and finally preserve the ecological environment and natural resources.In summary, the spy for reinforced concrete composite structure The research and development of high-strength high-performance concrete by preferably to have walked out the road of a sustainable development using concrete, it By the integration capability and performance of lift structure engineering, promote steel-concrete combined structure in China, especially highlight lines and many chance ground High-rise, super/special skyscraper in shake area, offshore platform or submerged structure, hypogee, super/Super-Long Span, super/extra-heavy duty type knot Popularization and application in structure, improve the scientific and technological content of building structure in infrastructure and human settlement, and play it and have larger hold Loading capability and rigidity, good anti-seismic performance, construction speed be fast, durable and fire resistance is good and significant social and economic benefit etc. Unique advantage.Therefore, the special high-strength high-performance concrete combining structure of shaped steel has very high engineering application value and wide city Field prospect.

Embodiment

What the present invention was developed is used for the special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240, In addition to using similar material-cement, sand, rubble, water with normal concrete, its indispensable component is also added into：It is mixed Solidifying soil high-performance water reducing agent, concrete high-efficiency expanding agent and active mineral admixture (silica flour, flyash), are also mixed with powder in addition Last defoamer, exciting agent and composite highly effective plasticity-maintaining agent.Special high-strength high-performance concrete is different from normal concrete, its intensity and property Relatively commonly it can be greatly improved with high-strength concrete.The ratio of mud of special high-strength high-performance concrete is generally less than 0.22, its water-cement ratio is less than 0.15, and the ratio of mud of common and high-strength concrete is general more than 0.30, and special high-strength and high performance is mixed The maximum size of coarse aggregate for coagulating soil is also smaller than common and high-strength concrete.Above-mentioned every difference result in special high-strength and high performance and mix Solidifying soil has very big difference with common and high-strength concrete in performance, is expected disastrously by adding superfine active mineral, using surpassing Pozzolanic reaction, (micro-) filing effect and the plasticization effect of activity mineral spike, optimize extra-high strong high-performance concrete material The grain composition of middle binder materials part, not only makes the interfacial structure gathered materials in special high-strength high-performance concrete between Behavior of Hardened Cement Paste And the pore structure of Behavior of Hardened Cement Paste is greatly improved, consistency, the impermeability of Behavior of Hardened Cement Paste are improved, while typical fine and close Structure can expand to aggregate surface, so that special high-strength high-performance concrete is more closely knit hard, special high-strength high-performance concrete Mechanical property (adhesive property especially between shaped steel) and endurance quality improve a lot.Meanwhile, pass through powder The incorporation of defoamer, can reduce and be formed in concrete whipping process and remain on cement slurry in concrete after vibration compacting In or a large amount of bubbles of interface transition zone between cement slurry and aggregate carry out deaeration, effectively improve its compactness, to spy The mechanical property (including adhesive property between shaped steel) of high-strength high-performance concrete and the raising of endurance quality are made that No small contribution.In addition, by the admixture of exciting agent, can make concrete that there is certain micro-expansibility, improve the receipts of concrete Contracting performance；Water of coal ash can be strengthened with during using aluminosilicate as the corrosiveness of the vitreum of main aquation component, increased The activity of big flyash, improves the power of positive hydration reaction, generates more C-S-H gels, drated calcium aluminate and aquation silicon The crystal such as sour calcium, intensity and corrosion resistance to institute's concrete batching increase significantly.And concrete high-efficiency expanding agent Admixture, the volume contraction cracking produced by can reacting concrete hardening is compensated, and can be filled, be blocked each in concrete Capillary slit is planted, anti-crack and anti-seepage performance, density, intensity and the volume stability of concrete is improved.For high-performance water reducing agent With the admixture of composite highly effective plasticity-maintaining agent, cement water consumption is reduced, has certain scattered and wetting action to cement granules, makes to mix The early-age shrinkage rate for coagulating soil decreases, and is effectively reduced the development of early cracks of concrete, can not only improve concrete The relatively low shortcoming of early strength, moreover it is possible to significantly improve type steel performance durability and mechanical property (plasticity, Adhesive property between compression strength, shaped steel and concrete etc.).

Bonding between plain bar and concrete is similar, and the cohesive force between shaped steel and concrete is also main by chemistry Bond, frictional resistance and the part of mechanical snap power three composition.Each part of cohesive force between shaped steel and concrete Performance all with concrete is closely related.

Chemical bond power is the chemical adhesion strength or absorption affinity that the cement gel body in concrete is produced on shaped steel surface, its (shearing resistance) limiting value depends on the property of cement and the degree of roughness on shaped steel surface.During casting concrete, cement slurry is in steel Surface produces surface tension, and in the presence of surface tension, the cement slurry on steel surface will form self-balancing；Pour into a mould coagulation Soil will typically be vibrated, and power of vibrating (disturbance) can be strengthened and accelerate cement slurry to the infiltration of steel surface oxide layer； Cement slurry is crystallized in maintenance processes, cement crystal formation chemical bond power.Chemical bond power is only in steel reinforced concrete structure Being originally formed under state for part is present, once occurring (part) bond-slip on joint face, cement crystal will be cut simultaneously Attrition crushing, chemical bond power is then lost.The principal element of influence chemical bond power has concrete strength, shaped steel steel surface thick Rough degree, test specimen pour mode and the contraction situation of vibrate degree and the maintenance in later stage and concrete etc..

After chemical bond power is lost, the steel surface shape caused by the rough and other reason of steel surface Condition changes (steel surface is uneven), it is interlocked with the concrete crystal grain on contact surface, is thus formed Mechanical snap power.For the shaped steel such as plant produced and the rolled steel joist of postmenstruation processing, once bond-slip development is accelerated, Concrete crystal on shaped steel and concrete surface is crushed integration, at this moment mechanical snap power also substantial loss.Influence machine Degree of roughness and surface appearance (corrosion degree etc.), aggregate level of the principal element of tool snap-in force for shaped steel steel surface Match somebody with somebody, the force way of concrete strength and Steel Reinforced Concrete Members etc..

Shaped steel surrounding concrete to being formed after bond failure that the frictional resistance of shaped steel is also between shaped steel and concrete, And mainly just played a role after mechanical snap power is lost substantially.After chemical bond power, especially mechanical snap power are lost, Due to being cut, crushed and expanded with the concrete crystal on shaped steel contact surface, the lateral confinement such as protective layer and stirrup, is incited somebody to action in addition Normal pressure is produced on the joint face of shaped steel and concrete, it is larger to add coefficient of friction on joint face, so as to form friction resistance Power.Frictional resistance all exists always after the forfeiture of chemical bond power, is the main of later stage cohesive force between shaped steel and concrete Part.The factor of influence frictional resistance has the shaped-steel layout and its surface characteristics of shaped steel, adhesive surface between shaped steel and concrete Factor (the concrete protective thickness of shaped steel of lateral confinement is matched somebody with somebody and influenceed to size, member stress mode, aggregate level Degree, stirrup ratio, concrete shrinkage) etc..

Key technical problem to be solved by this invention is to ensure the mechanics that special high-strength high-performance concrete should possess Performance (i.e. intensity and plasticity) and with high-durability, high workability, high volume stability and economy on the basis of, significantly Ground improves (nature) adhesive property between concrete and shaped steel, make in steel reinforced concrete structure is designed need not (or only need by Detailing requiments are a little) add shearing connecting piece on shaped steel surface, you can ensure there is reliable bonding between shaped steel and concrete And anchoring, make both can harmonious, cooperation under load action.

The present invention breaks the limitation of " full sieve rice " formula, passes through orthogonal experiment and contrast from principle and design principle Experimental method, it is considered to concrete high-performance water reducer, concrete high-efficiency expanding agent, defoamer, exciting agent, efficient plasticity-maintaining agent it Between and its compatibility with cement, between maximum size of coarse aggregate, coarse aggregate different-grain diameter and its between fine aggregate particle diameter The influence of level pairing concrete strength and performance and the performance such as (micro-) filing effect, pozzolanic activity of active mineral additives because Element, from high-quality coarse-fine aggregate and controls particle diameter and level to match somebody with somebody, and is mixed in special high-strength high-performance concrete its preparing materials appropriate Concrete high-performance water reducer, concrete high-efficiency expanding agent, concrete composite highly effective plasticity-maintaining agent and high-quality active mineral superfine powder, And consider the addition of defoamer and exciting agent, the ratio of mud is reduced, based on the existing material that is easy to get in locality, does not change conventional production Technique, flies upward and adopts to reduce cement granules, additive particle and superfine active mineral grain as far as possible everywhere when concrete is stirred The feeding method of sandstone stirring technique is wrapped up in cement, is filled out using the pozzolanic reaction of active mineral admixture, enhancement effect, (micro-) Filling effect, durability improves the warm peak subtractive effect of effect and the special high-strength high-performance concrete heat of hydration, and makes full use of activity The compound incorporation of mineral admixture and active mineral admixture and surpassing produced by the composite blend of concrete high-performance water reducer Synergistic effect, the deaeration effect of defoamer, the compensation contraction of swelling agent and filling effect, the activity excitation of exciting agent are acted on, again The guarantor's modeling decrement and deferred action for closing efficient plasticity-maintaining agent, make mechanical property (adhesive property especially between shaped steel) Good, excellent service behaviour, excellent in durability, advantage of lower cost suitable for steel reinforced concrete structure reliability application it is strong Spend the special high-strength high-performance concrete that grade is C240.The mechanical property test comparing result of the present invention is as shown in table 4.

During present invention selection raw material, raw material are not required nothing more than for high-quality, also require to prepare special high-strength high-performance concrete Raw material used are easy to get for locality.Furthermore, it is contemplated that the intensity of institute's concrete batching is very high, it is right according to maximum density theory The grain composition of coarse-fine aggregate is optimized in concrete material, large or fine granule is had good filling mutually, to reduce aggregate Voidage；Meanwhile, the average grain diameter of general cement is 20~30 μm, and the particle less than 10 μm is simultaneously few, and active mineral is mixed The grain diameter for closing material is tiny more than cement granules particle diameter, and the average grain diameter of superfined flyash is 3~6 μm, can filling concrete Space between grain, the average grain diameter of SILICA FUME also very little, is 0.10~0.26 μm, can filling concrete particle and superfined flyash Space between particle and between superfined flyash particle, the average grain diameter of nanometer SILICA FUME is smaller, is 10nm~0.1 μm, It can fill between gel particles and its fine gap or space between interfacial structure, so in the extra-high strong high property prepared The grain composition of binder materials part can be optimized in concrete material also most important.And the outside deterioration factor (such as sulphur The factors such as hydrochlorate) pore structure of concrete is heavily dependent on to the aggressivity of concrete, and this exactly causes coagulation The main cause of native endurance issues.The incorporation of active mineral admixture, reduces the voidage between cement granules and interface, Make water mudrock structure and interfacial structure more fine and close, blocked the permeation pathways being likely to form, so that is prepared is extra-high strong The impermeability of high performance concrete is increased substantially, water and other various etching medium (CL^-、SO4^2-, CO2 etc.) be difficult to enter Inside concrete, and the occurrence probability of Alkali- silica reaction and the generation probability of calcium hypochlorite can be reduced, its intensity and endurance quality are obtained To increasing substantially.I.e. when the macropore content for being more than 0.1 μm in water mudrock structure and interfacial structure is relatively low, it is beneficial to be matched somebody with somebody The improvement of the properties of the special high-strength high-performance concrete of system, otherwise, to preparing the intensity of special high-strength high-performance concrete, resisting Ooze performance, corrosion resistance and endurance quality unfavorable.

It after active mineral admixture substitution part of cement, can also be filled out the portion of water in cement granules space The mineral admixture filled in it is cemented out, and can increase the fluidity of cement paste.But also not all mineral are blended Material all has this significant plasticization effect, the specific surface area mainly due to amount of activated mineral admixture it is too big or its Body has loose structure, although it, which replaces, can displace the part moisture in cement paste after cement, but due to itself water suction Or wetting surface needs more free water, causes the mobility of cement paste not increase.In order to ensure developed extra-high strong height The high workability energy of performance concrete, the present invention is combined incorporation using concrete high-performance water reducer and active mineral admixture Method, under both collaborative works, the subparticle of active mineral additives has not only given full play to their (micro-) filling effect Should, and the moisture being filled among space is cemented out, water barrier thickeies between making between particle；In addition, active mineral is mixed The subparticle for closing material has adsorbed concrete high-performance diminishing agent molecule, the electrostatic produced by the electric double layer current potential that its surface is formed Repulsion is more than the gravitation between powder particle, promotes powder granule to disperse, and is further exacerbated by the scattered of cement granules, makes The mobility increase of cement paste, so as to effectively improve the mobility of compound；Meanwhile, super fine active mineral admixture Compound incorporation reduces the heat of hydration, can improve the volume stability of concrete.

The aggregate in raw material for preparing special high-strength high-performance concrete should have higher inherent strength, toughness and Stability, so that various static and dynamic stress, impact and corrasions, the concrete batching performance without causing can be resisted Decline.Because the surface state of different aggregates is different, cause the adhesion strength between cement slurry and aggregate also to differ, lead to Rubble has higher adhesion strength compared with cobble in the case of often；On the other hand, silicon ash content ratio is asynchronous viscous in cement slurry Knotting strength difference is also very big, during mixing silica, much higher when the adhesion strength between cement slurry and aggregate is not than mixing.Common coagulation Soil is in destruction, and the bonding interface of cement slurry and aggregate is weak link, and crack is the boundary along cement slurry and aggregate What face occurred, aggregate will not typically be destroyed, and extraneous corrode also tends to develop since this interface, and special high-strength and high performance coagulation The bonding interface of cement slurry and aggregate in soil is no longer weak link, and its destruction is also no longer along interface, but Caused by the destruction of aggregate, therefore the performance of aggregate has large effect to the performance of special high-strength high-performance concrete. In the research of the present invention fine aggregate selected using particle is round and smooth, quality is hard, level with good, clay content it is small in thick river sand； Coarse aggregate be rough surface, fine quality, level with good using granite, basalt as the artificial rubble of main component, it is most Big particle diameter should be controlled in 10mm.So, the uniformity of concrete has been got back further lifting, so that concrete is more encrypted Real, intensity can also be further enhanced.

The present invention wraps up in sandstone method (also known as improved SEC methods) concrete stirring technology using cement in the preparation, is forcing It is stirred in formula mixer, its feeding sequence is：First by poly carboxylic acid series concrete high-performance water reducing agent, exciting agent and compound height Effect plasticity-maintaining agent is uniformly admixed in load weighted water, obtains mixture；Then add fine aggregate and be mixed with high-performance water reducing agent and swash 1/3 → stirring (1~2 minute) → of hair agent composition total amount adds coarse aggregate and is mixed with high-performance water reducing agent and exciting agent The 1/3 of amount of the mixture → stir (2~4 minutes) → addition whole cementing material (cement, swelling agent, silicon ash and fine coal Ash) → stirring (3~4 minutes) → adds defoamer and residue is mixed with high-performance water reducing agent and excites agent composition → uniformly Stirring (2~3 minutes) → being stirred for after stopping 3 minutes to uniform (2~3 minutes) → discharges.This technique can reduce water as far as possible Mud particle and superfine active mineral grain are flown upward everywhere when concrete is stirred, and can improve the intensity of prepared concrete, and Segregation phenomenon should not occur in prepared concrete, and bleeding is few, and service behaviour is relatively preferable.

The present invention is in maintenance using the steam curing in heating curing, and its maintenance flow is：It is quiet stop (4~6 hours) → (relative humidity is more than 95% to → heated at constant temperature, and 80 DEG C~90 DEG C, 48~72 is small for heating heating (programming rate is 10 DEG C per hour) When) → cool and heat (cooling rate is 10 DEG C per hour) → standard curing to 28 days.The maintenance process can accelerate cement and The process of active mineral admixture hydration reaction and the performance of volcano ash effect, can improve concrete microstructure, improve it Interfacial adhesion and intensity.

Embodiment：

(1) raw material

1. cement

Steady quality, the 62.5R cement of Qinling Mountains board P I of better performances are selected, the preceding and high property of poly carboxylic acid series concrete is used Energy water reducer carries out compatibility test between the two, and test method uses existing building material industry standard《Cement and water reducer phase Compatibility test procedures》Method in JC/T 1083-2008, it is good with poly carboxylic acid series concrete high-performance water reducing agent compatibility.Institute Cement performance index is selected to meet《Portland cement, Portland cement》The national existing relevant criterion such as GB175-2007 will Ask, its alkali content is few, the heat of hydration is low, water requiremen is also low.

2. aggregate

3. mass ratio is used for 8:2 sand and quartz sand.

Sand is using particle is round and smooth, quality is hard, level with thick, Ba river sands partially in good, the quality of sand meets existing building materials Professional standard《Regular concrete sand, stone quality and test method standard》JC/T 52-2006 and national standard《Building sand》 High-quality sand standard specified in GB/T 14684-2011.Its modulus of fineness is 3.0, and clay content and clod content are controlled 0.3% (in mass), chloride ion content was controlled in 0.02% (in terms of the quality of dry sand) below, SO below₃Content should be little In 0.5%.

Selection quality is consummate, level matches somebody with somebody good quartz sand.Its dioxide-containing silica should be not less than 99%, and di-iron trioxide contains Amount should be not more than 0.005%, and the metals content impurity such as chromium, titanium should be not more than 0.01%.When carrying out the Concrete, using not Same grain size specification (2-4mm, 1-2mm, 0.63-1mm, 0.315-0.63mm, 0.16-0.315mm,<0.16mm) multistage is matched somebody with somebody and fed intake.

4. flyash

Using the special fine powdered coal of I grade of high-quality of the advanced power plant's production of coal burning process.Its quality meets national standard《For Flyash in cement and concrete》The regulation requirement of the relevant criterions such as GB/T 1596-2005, its fineness (0.045mm square hole Sieve is tailed over, %) it is not more than 5%, loss on ignition is 2.2%, SO₃Content is 1.5%, and water demand ratio is less than 95%, and specific surface area is about For 1000m²/kg。

5. silica flour

Mass ratio is used for 3:2 30nm nano silica fumes and sub-micro silica flour, the 30nm nano silica fumes and (Asia) micro- silicon of selection The quality of powder meets national standard《Mineral admixture for high-strength high-performance concrete》The relevant criterions such as GB/T 18736-2002 Regulation requirement, the moisture content of 30nm nano silica fumes and (Asia) SILICA FUME is respectively less than 1%, and loss on ignition is no more than 3%, chlorion Content is no more than 0.01%, and pozzolanic activity index is all higher than 95%.Wherein, the specific surface area of 30nm nano silica fumes is about 42000m²/ kg, silicone content is not less than 99.9%；The specific surface area of (Asia) micron silica flour is about 27000m²/ kg, silica contains Amount is not less than 99%.

6. concrete high-performance water reducer

By a large amount of tentative contrast tests and with cement compatibility test, the high efficiency water reducing agent selected by the invention is poly- Carboxylic serials concrete high-performance water reducer, its quality meets existing national standards《Concrete admixture》The phases such as GB 8076-2008 The regulation requirement of pass standard, the water-reducing rate of selected high efficiency water reducing agent is more than 30%.The maximum doping quantity of selected high efficiency water reducing agent For the 2.5% of whole binder total amounts, using with mixing method, using it is preceding carry out with selected cement type compatibility test and Compatibility is good.

7. exciting agent

It is by mixing from the efficient flyash excitant (FAEA) by research team's independent development where inventor There is the research of the Ultrafine Grinding pulverized burned coal ash hydration reaction characteristicses of nano silica fume and sub-micro silica flour and recognize that its activity needs further On the basis of exciting and utilizing, solid sheet NaOH and commercially available sodium metasilicate (are utilized by the waterglass of inorganic material 65%~75% Waterglass is modulated into the waterglass that modulus is about 1.0 in proportion), 23%~30% common dihydrate gypsum (CaSO₄·2H₂O) and have The triethanolamine of machine material 3%~5% (TEA) is compound to be formulated.Preparation method is as follows：Solid sheet NaOH is dissolved in water first In certain density alkaline solution is made, then with the sodium silicate water glass (modulus general 2.4 of commercial water glass of known modulus Between~3.3) waterglass of the modulus for 1.0 experiment needs is modulated into, finally it is combined and prepares with common dihydrate gypsum and TEA again As required composite exciting agent (FAEA), table 1 is referred to.Determined through experiment, the exciting agent and early strength silicate cement, polycarboxylic acids Series concrete high-performance water reducing agent has good compatibility.

The different ratio of table 1FAEA exciting agents

8. swelling agent

By a large amount of tentative contrast tests and with cement compatibility test, the swelling agent selected by the invention be suitable for The calcium sulphoaluminate class concrete high-efficiency expanding agent of special high-strength high-performance concrete, its quality meets national standard《Concrete expansion Agent》The regulation requirement of the relevant criterions such as GB23439-2009, and its fineness (0.08mm square hole screens are tailed over, %) is not more than 10%, Specific surface area is about 400m²/ kg, limited expansion rate (in water 7 days) is more than 55MPa, MgO not less than 0.05%, 28d compression strength Content is not more than 2%, and alkali content is not more than 0.3%.

8. plasticity-maintaining agent

From the composite highly effective plasticity-maintaining agent suitable for special high-strength high-performance concrete, the plasticity-maintaining agent includes following mass ratioes Raw material：

Concrete plasticity-maintaining agent 5%~15%；Hydroxycarboxylic acid salt retarder 45%~55%；Macromolecule economization agent 35%~ 40%.

Wherein, concrete plasticity-maintaining agent is the stable market of the property for having preferable compatibility with poly- hydroxy acid series high-efficiency water-reducing agent The plasticity-maintaining agent of sale.Hydroxycarboxylic acid salt retarder is in sodium gluconate, sodium potassium tartrate tetrahydrate, sodium citrate, sodium salicylate It is a kind of.Macromolecule economization agent is the comb polymer containing polyoxyalkylene chain, the polymer containing polyethers and aliphatic category organic matter, contained One kind in the copolymer of methyl ether based polyalcohol/methyl ether based polyalcohol.

Wherein, the comb polymer containing polyoxyalkylene chain is what Jiangsu Subotexin Material Co., Ltd developed JM-SRA series concrete economization agents, its main component is alkyl polyoxyethylene ether；It is poly- containing polyethers and aliphatic category organic matter Compound is the JSJ type economization agents that Metallurgical Research Institute, Department of Architecture is developed, and its main component is polyethers and aliphatic category organic matter；Contain The copolymer of methyl ether based polyalcohol/methyl ether based polyalcohol is that the institute of civil engineering of Zhejiang University develops ZZD-A type economization agents, its Main component is methyl ether based polyalcohol and methyl ether based polyalcohol.

The different ratio of the plasticity-maintaining agent of table 2

9. mixing water

It is mixing water from running water, its quality meets Minstry of Housing and Urban-Rural Development of People Republic of China's ministerial standard《Concrete mixing water supply standard》JGJ The regulation requirement of the relevant criterions such as 63-2006, and alkali content is less than 800mg/L.

(2) match ratio

The present invention is mixed for the strength grade that will be applied in steel reinforced concrete structure for C240 special high-strength and high performance The match ratio that solidifying soil is provided is as shown in table 3.

Table 3 is used for the extra-high strong high-performance concrete mix (unit of reinforced concrete composite structure：kg/m³)

(3) stirring technique

The invention wraps up in sandstone method concrete stirring technology using cement, and concrete technology step is as follows：

First by poly carboxylic acid series concrete high-performance water reducing agent 20.2kg/m³, exciting agent 10.5kg/m³Protect and mould with composite highly effective Agent 0.6kg/m³Uniformly admix load weighted water 101kg/m³In, obtain mixture；Then stirred according to weight proportion in forced action type 608kg/m is added in machine³River sand, 152kg/m³Quartz sand and be mixed with high-performance water reducing agent, exciting agent and composite highly effective and protect modeling The 1/3 of agent composition total amount, uniform stirring adds 1293kg/m after 1~2 minute³The coarse aggregate (continuous size fractions of 5~Φ of Φ 10 Rubble) and it is mixed with the 1/3 of high-performance water reducing agent, exciting agent and composite highly effective plasticity-maintaining agent amount of the mixture, 2~4 points of uniform stirring Zhong Hou, adds whole cementing materials (including swelling agent)：500kg/m³Cement, 51kg/m³Swelling agent, 58.2kg/m³'s Nano silica fume, 38.8kg/m³(Asia) SILICA FUME and 123kg/m³Flyash, uniform stirring is after 3~4 minutes, adds 1.4kg/ m³AGITAN@P803 powder defoamers and the remaining mixture for being mixed with high-performance water reducing agent and exciting agent, uniform stirring 2~3 Minute, rest is stirred for 2~3 minutes to uniform, discharging after 3 minutes, produce the concrete mix of C240 strength grades.

This technique can reduce cement granules, additive particle and superfine active mineral grain as far as possible when concrete is stirred Fly upward everywhere, and the intensity of prepared concrete can be improved, and segregation phenomenon should not occur in prepared concrete, bleeding is few, Service behaviour is relatively preferable.

(4) maintenance process

The invention uses the steam curing in heating curing, and specific maintenance flow is as follows：

Quiet stop (4~6 hours) → (relative humidity is more than → heated at constant temperature for heating heating (programming rate for per hour 10 DEG C) 95%, 80 DEG C~90 DEG C, 48~72 hours) → cool and heat (cooling rate is 10 DEG C per hour) → standard curing to 28 days.

The maintenance process can accelerate the process and the hair of volcano ash effect of cement and active mineral admixture hydration reaction Wave, the microstructure of prepared concrete can be improved, its interfacial adhesion and intensity is improved.

(5) mechanical property test Comparative result

The strength grade suitable for reinforced concrete composite structure prepared according to above-mentioned match ratio is the extra-high of C240 The mechanical property contrast test knot of strong high performance concrete and general super high strength concrete (strength grade is C240 concrete) Fruit is as shown in table 4.

The mechanical performance of concrete comparative test result of table 4

From table 4, it can be seen that the special high-strength high-performance concrete that the strength grade prepared by the technology is C240, is realized Can ensure that mechanical property (i.e. C240 strength grades, plasticity etc.) that it should possess and with high-durability, high reliability, On the basis of high workability, high volume stability and economy, (nature) being significantly improved between concrete and shaped steel is bonded Performance, adhesion strength improves 1.78 times.Make in steel reinforced concrete structure is designed without (or only needing a little by detailing requiments Ground) add shearing connecting piece on shaped steel surface, you can ensure effective collaborative work of shaped steel and concrete, so as to reduce construction Process, has saved steel, improves efficiency of construction, and avoids shearing connecting piece is largely set on shaped steel surface and is easily caused mixed The defects such as the solidifying internal congenital microcrack of soil, can bring significant economic benefit and construction quality improvement effect, with higher Engineering application value and wide market prospects.

Claims

1. a kind of concrete for reinforced concrete composite structure C240 strength grades, it is characterised in that the concrete according to kg/m³Match ratio be：

Cement: fine aggregate: coarse aggregate: water: water reducer: defoamer：Silica flour: flyash：Exciting agent：Swelling agent：Compound plasticity-maintaining agent =500: 760: 1293: 101: 20.2: 1.4: 97: 123: 10.5: 51: 0.60；

The compound plasticity-maintaining agent is composite highly effective plasticity-maintaining agent, and the plasticity-maintaining agent includes the raw material of following mass ratioes：

The hydroxycarboxylic acid salt retarder is one kind in sodium gluconate, sodium potassium tartrate tetrahydrate, sodium citrate, sodium salicylate；

The macromolecule economization agent is the comb polymer containing polyoxyalkylene chain, the polymerization containing polyethers and aliphatic category organic matter One kind in the copolymer of thing, based polyalcohol containing methyl ether/methyl ether based polyalcohol；

The comb polymer containing polyoxyalkylene chain is JM-SRA series concrete economization agents；

The polymer containing polyethers and aliphatic category organic matter is JSJ type economization agents；

The copolymer of the based polyalcohol containing methyl ether/methyl ether based polyalcohol is ZZD-A type economization agents.

2. a kind of concrete for reinforced concrete composite structure C240 strength grades according to claim 1, it is special Levy and be, the fine aggregate uses mass ratio for 8:2 ratio particle is round and smooth, quality is hard, level is with partially thick river sand in good With quality is consummate, level matches somebody with somebody good high grade quartz sand；Its modulus of fineness be 2.8~3.2 between；By quality ratio, its clay content It should be not more than 0.3% with clod content；In terms of the mass ratio of dry sand, its chloride ion content should be not more than 0.02%, SO3 contents should No more than 0.5%；Dioxide-containing silica should be not less than 99% in quartz sand, and ferric oxide content should be not more than 0.005%, Chromium, titanium impurity content should be not more than 0.01%.

3. a kind of concrete for reinforced concrete composite structure C240 strength grades according to claim 1, it is special Levy and be, the coarse aggregate uses that quality densification is hard, intensity is high, rough surface, particle shape is almost spherical, elongated particles Small, level, using basalt, granite as the artificial rubble of main component, is thrown with good according to 5~Φ of continuous size fraction rubble Φ 10 Material；The cubic compressive strength of its parent rock of coarse aggregate should be not less than 290MPa, and maximum particle diameter should be controlled in 10mm；With quality Than meter, its SO₃Content should be not more than 0.5%, and clay content should be not more than 0.2%, and clod content should be not more than 0.1%, pin, sheet Granule content should be not more than 0.5%, and must not be mixed into weathering particle.

4. a kind of concrete for reinforced concrete composite structure C240 strength grades according to claim 1, it is special Levy and be, the water reducer selects poly carboxylic acid series concrete high-performance water reducing agent, water-reducing rate should be greater than 30%, maximum saturation volume Should be not less than the 2.5% of whole binder total amounts.

5. a kind of concrete for reinforced concrete composite structure C240 strength grades according to claim 1, it is special Levy and be, the cement selects the 62.5R portland cements of P I；

The defoamer selects AGITAN@P803 powder defoamers.

6. the concrete according to claim 1 for reinforced concrete composite structure C240 strength grades, its feature exists In the silica flour uses mass ratio for 3:2 30nm nano silica fumes and sub-micro silica flour, 30nm nano silica fumes and sub-micro silica flour contain Water rate all should be not more than 1%, and loss on ignition all should be not more than 3%, and chloride ion content all should be not more than 0.01%, and pozzolanic activity refers to Number should be greater than 95%；Wherein, the specific surface area of 30nm nano silica fumes should be not less than 40000m²/ kg, silicone content should be not less than 99.9%；The specific surface area of sub-micron silica flour should be not less than 25000m²/ kg, dioxide-containing silica should be not less than 95%；

The flyash is using I grade of special fine powdered coal of high-quality, and 0.045mm square hole screens, which are tailed over, should be not more than 10%, and its loss on ignition should No more than 3%, SO₃Content should be not more than 2%, and water content should be not more than 1%, and water demand ratio should be not more than 95%, specific surface area It should be greater than 700m²/kg。

7. the concrete according to claim 1 for reinforced concrete composite structure C240 strength grades, its feature exists In the exciting agent is flyash excitant FAEA, and it is combined according to the raw material of following mass percent meters and is formulated：

65%~73% waterglass；23%~30% dihydrate gypsum；3%~5% triethanolamine；

The waterglass is to be modulated into the water glass that modulus is 1.0 in proportion using solid sheet NaOH and commercially available sodium silicate water glass Glass.

8. the concrete according to claim 1 for reinforced concrete composite structure C240 strength grades, its feature exists In the swelling agent selects calcium sulphoaluminate high-efficiency expanding agent, and 0.08mm square hole screens, which are tailed over, should be not more than 10%, and its specific surface area should More than 300m²7 days limited expansion rates should should be not less than 50MPa, content of MgO not less than 0.05%, 28d compression strength in/kg, water 3% should be not more than, alkali content should be not more than 0.5%.

9. it is used for the preparation method of the concrete of reinforced concrete composite structure C240 strength grades described in a kind of claim 6, Characterized in that, this method wraps up in sandstone method concrete stirring technology using improved cement, concrete technology step is as follows：

1) first by water reducer 20.2kg/m³, exciting agent 10.5kg/m³With compound plasticity-maintaining agent 0.60kg/m³Uniformly admix load weighted Water 101kg/m³In, obtain mixture；

2) 608kg/m and then according to weight proportion is added in forced mixer³River sand, 152kg/m³Quartz sand and step The 1/3 of rapid 1) amount of the mixture, 1~2min of uniform stirring；

3) 1293kg/m is added³The continuous size fraction rubble coarse aggregates of 5~Φ of Φ 10 and step 1) amount of the mixture 1/3, uniformly Stir 2~4min；

4) whole cementing materials are subsequently added into：500kg/m³Cement, 51kg/m³Swelling agent, 58.2kg/m³Nano silica fume, 38.8kg/m³Sub-micro silica flour and 123kg/m³Flyash, 3~4min of uniform stirring；

5) it is eventually adding 1.4kg/m³Defoamer and remaining step 1) mixture, 2~3min of uniform stirring, stop 3 minutes after again 2~3min is stirred to uniform, discharging, the concrete mix of C240 strength grades is produced.