CN105906258A

CN105906258A - Concrete having strength grade of C240 and used for steel reinforced concrete combined structure

Info

Publication number: CN105906258A
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: 2016-08-31
Anticipated expiration: 2036-04-08
Also published as: CN105906258B

Abstract

The invention discloses a concrete having a strength grade of C240 and used for a steel reinforced concrete combined structure. The concrete is prepared from cement, fine aggregate, crude aggregate, water, a water reducer, an antifoaming agent, silicon powder, fly ash, an exciting agent, an expanding agent and a composite plasticity-maintaining agent in a ratio of 500: 760: 1293: 101: 20.2: 1.4: 97: 123: 10.5: 51: 0.60. The preparation method comprises the following steps: uniformly mixing the water reducer, the exciting agent and the composite plasticity-maintaining agent with water so as to obtain a mixture, successively adding the fine aggregate and one third of the mixture into a mixer according to weight proportion and carrying out uniform mixing; adding the crude aggregate and another one third of the mixture and carrying out uniform mixing; adding the cement, expanding agent, silicon ash and fly ash and carrying out uniform mixing; and adding the antifoaming agent and the residual mixture and carrying out stirring and discharging. The concrete prepared in the invention can substantially improve bonding between section steel and concrete in a natural state, gives full play to respective mechanical properties and mutual cooperation performance of the section steel and concrete, greatly improves the bearing capability, usage performance and endurance of a structural element, and has high volume stability and economic performance.

Description

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

Technical field

The invention belongs to building material technical field, relate to a kind of for reinforced concrete composite structure strength grade be C240's 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, and the scope of application is wide The first in the world may be occupied.Although concrete is a kind of traditional manufactured construction materials, but to have the superiority do not replaced (former because of it Material is abundant, production technology simple, cost performance advantages of higher) and concrete material science and technology is continuous progressive, concrete Become the main body of civil engineering material, also will be one of indispensable main material in following civil engineering and nation-building. Meanwhile, along with the continuous expansion of city size, being on the increase of population, the continuous rising of land price, the harsh of local environment is built Changing, the most progressive and rapid development of economy of Building technology, building increasingly extends in aerial, underground and water, i.e. builds Build super/extra-highization, super/Super-Long Span, underground, lightweight and the development of heavy type structure, especially steel reinforced concrete structure to exist Answering of the novelties such as super/extra-highization, super/Super-Long Span, underground, sea or change, lightweight under water or megaplex engineering field With, the requirement of construction material this to concrete is more and more higher.Therefore, super/extra-high strengthening of concrete and super/special durableization Research and practice will become the development trend in this field.

Reinforced concrete composite structure (being called for short SRC structure) is a kind of principal mode of steel concrete combinative structure, due to it Bearing capacity is high, rigidity is big, ductility good, anti-seismic performance is superior, fire retardant anticorrosion, be easy to the series of advantages such as construction, is got over More it is widely used in greatly across, heavy type structure, underground, under water or marine engineering and the high level of earthquake/typhoon zone and super/extra-high Layer building.Compared with steel construction, SRC structure can save great deal of steel, strengthens section rigidity, overcomes steel structure fire-resistant, resistance to Corrosivity and the shortcoming such as poor durability and easy flexing unstability, make the ability of steel be fully played；With ordinary reinforced concrete Structure (abbreviation reinforced concrete structure) is compared, and reinforced concrete composite structure can reduce the sectional dimension of component, the space shared by reduction, Thus increase building and use space；In construction, the steel skeleton of steel reinforced concrete structure itself can hang mould, sliding formwork as concrete Skeleton, not only enormously simplify formwork engineering, be also subject to whole construction loads (include hang, sliding formwork and institute's pouring concrete) Supporting system；Further, since the SRC structure advantages such as to have globality strong, good working ductility, reinforced concrete can be substantially improved The brittleness of soil sheared destruction, makes the anti-seismic performance of structure be significantly improved, and bearing capacity and ductility are all than reinforced concrete structure It is greatly improved.Therefore, in developed countries such as Japan and America and Europes, the SRC structure with good anti-seismic performance has become a kind of The novel earthquake-proof structural system generally acknowledged, and structure big with steel construction, timber structure, reinforced concrete structure referred to as four.China is also Being the country of earthquake more than, most areas are earthquake territory, and part is positioned at highlight lines and frequently occurred earthquake district, pushes away in these areas Wide SRC structure just has very important realistic meaning；On the other hand, housing need amount is made also to exist due to quickly increasing of population It is on the increase, and land resource scarcity is valuable, and then promote building and develop to more high spatial, therefore in economic condition and city Super/special skyscraper is built in planning under conditions of allowing also become saving fund and save the effective measures in soil.Therefore, SRC knot Structure has boundless application prospect in China, especially with China's economic strength constantly strengthen and super/special high-strength steel and The successful development of special high-strength high-performance concrete (they are putative 21 century materials) and application, will be greatly facilitated this knot The popularization and application of structure system and progress.There are some researches prove, the intensity of special high-strength high-performance concrete is the highest, and its fragility will Can increase, ductility also can be poor, and under heavily stressed or complex stress condition, special high-strength high-performance concrete component will be by fragility control Destructive process processed, the reliability of work reduces.But, this novel High Technique Concrete is applied and is combining at steel reinforced concrete In structure (being called for short SRC structure), i.e. shaped steel spy high-strength high-performance concrete combinative structure (being called for short SRUSUPC structure), Can maximize favourable factors and minimize unfavourable ones, high-strength high-performance concrete fragility is big, ductility is poor and shaped steel is fire-resistant, the weakness of poor corrosion resistance to overcome spy, Its superior function and economic benefit is made to be given full play to.

In SRC structure, cementation good between shaped steel and concrete is to ensure that SRC component Shaped Steel is coordinated with concrete The basis of work, shaped steel, reinforcing bar and three kinds of material elements collaborative works of concrete, to resist various action effect, can fill Its advantage is waved in distribution.But the cohesive force that one of significant difference of SRC structure and reinforced concrete structure is between shaped steel and concrete is far away Less than the cohesive force between reinforcing bar and concrete, shaped steel is only about equivalent to plain steel-bar cohesive force with the cohesive force of normal concrete 45%.Domestic and international many experimental studies show, there is bond-slip phenomenon between shaped steel and concrete, and to SRC Stress performance or even the bearing capacity of component have a significant impact.Therefore, how to ensure that shaped steel becomes with concrete collaborative work effectively One of emphasis for SRC structural research.At present, to the process side of bond-slip problem between shaped steel and concrete in engineering design Method typically has two kinds: the first adds a number of shearing connecting piece by calculating in component surface, so certainly will cause construction In inconvenience and improve cost, and easily cause the defects such as the congenital microcrack of inside concrete；It two is to be not provided with or only arrange few Amount shearing connecting piece, considers the impact of bond-slip, the corresponding bearing capacity reducing component in bearing capacity calculates, so must So there is uneconomic factor.On the other hand, Structural Design generally exists emphatically intensity and the phenomenon of light durability, Problem in terms of the safety in use of many xoncrete structures and durability had occurred both at home and abroad.Some concrete are tied Structure engineering i.e. completely loses use function due to the reason such as alkali-aggregate reaction, Chloride Attack in the not enough design period half of use Or even bearing capacity, even there is partial collapse or total Collapse in indivedual engineerings, cause casualties or Architectural Equipment is destroyed.Cause This, in SRUSUPC structure, improve the natural adhesive property between shaped steel and special high-strength high-performance concrete, on shaped steel surface It is not provided with or only arranges a small amount of shearing connecting piece by detailing requiments ensuring that shaped steel is worked in coordination with effectively with special high-strength high-performance concrete The research of work is significant；Meanwhile, the durability of concrete structure engineering causes close attention and the height of people the most day by day Degree is paid attention to, and becomes the problem that divination by means of the milfoil is to be solved.

Prior art has C30, C35, C40, C45, C50 for the strength grade of the concrete of reinforced concrete composite structure And the low-strength HPC of C55, the high-strength high-performance concrete of C60, C70, C80, C90 and C100 and The super high strength high performance concrete of C110, C120, C130, C140 and C150, follow-up C160, C170, C180, The technology of preparing of the super/special high-strength high-performance concrete of C190 and C200, above-mentioned each strength grade concrete significantly improves shaped steel And the adhesive property between (surpassing) high-strength concrete, and improve the durability of structure；But, there is also and can not thus extend To the special high-strength high-performance concrete of higher intensity, and shaped steel can not be solved when using it for reinforced concrete composite structure with extra-high The problem of the natural adhesive property difference between strong high performance concrete, therefore civil engineering work can not be met to aerial, underground and water Middle extension, i.e. building be super/extra-highization, and super/Super-Long Span, underground, sea or change under water, super-durable and heavy, huge And the application such as novel Structural Engineering and develop the requirement of this trend.It addition, prior art there is also part by super for concrete/ Extra-high strengthening, the technology of preparing of super/special durableization, but they are all not directed to or unresolved shaped steel and spy when SRC structure The problem of the natural adhesive property difference between high-strength high-performance concrete.

Summary of the invention

It is an object of the invention to provide and a kind of mix for special high-strength and high performance that reinforced concrete composite structure strength grade is C240 Solidifying soil.This concrete is applied in reinforced concrete composite structure, can naturalness (that is shaped steel surface is not provided with or only by Detailing requiments arranges a small amount of shearing connecting piece) under significantly improve the adhesive property between shaped steel and concrete, effectively play steel with mixed The solidifying soil respective mechanical property of bi-material and mutual cooperative work performance, thus significantly lift structure component bearing capacity with Serviceability；It addition, this concrete can improve the durability of structure, and have good service behaviour, high volume stability and Economy.

For solving above-mentioned technical problem, the present invention is achieved in that

A kind of concrete for reinforced concrete composite structure C240 strength grade, the match ratio of this concrete be (unit: kg/m³):

Cement: fine aggregate: coarse aggregate: water: water reducer: defoamer: silica flour: flyash: exciting agent: extender: compound Plasticity-maintaining agent=500: 760: 1293: 101: 20.2: 1.4: 97: 123: 10.5: 51: 0.60.

Described cement selects steady quality, better performances, P I 62.5R portland cement that intensity is higher, need before using with Poly carboxylic acid series concrete high-performance water reducing agent carries out compatibility test between the two, and test method uses existing building material industry standard Method in " cement and water reducer compatibility test method " JC/T 1083-2008, and select and poly carboxylic acid series concrete height The cement type that energy water reducer compatibility is good.Selected cement performance index (includes fineness, SO₃Content, content of MgO, initial set 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 cement type that the heat of hydration is low, water requiremen is the lowest.

The granule that described fine aggregate uses mass ratio to be 8:2 is round and smooth, quality is hard, grating good in partially thick fluvial sand and quality The quartz sand that consummate, grating is good.Wherein, the quality of sand should be not less than existing building material industry standard " regular concrete sand, Stone quality and test method standard " regulation in JC/T 52-2006 and national standard " building sand " GB/T 14684-2011 High-quality sand standard.Its modulus of fineness is between 2.8～3.2, and clay content and clod content should be not more than for 0.3% (in mass), 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%.Silicon dioxide in quartz sand 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 be not more than 0.01%.

Quality densification is hard, intensity is high, rough surface, particle shape are almost spherical, elongated particles is little for the employing of described coarse aggregate, The artificial rubble with basalt, granite as main component that grating is good, feeds intake according to continuous size fraction rubble Φ 5～Φ 10； The quality of rubble should be not less than existing building material industry standard " regular concrete sand, stone quality and test method standard " JC/T The regulation requirement of the relevant criterion such as 52-2006 and " cobble for building, rubble " 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 control at 10mm；By quality ratio, its SO₃ Content 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%, and pin, sheet-like particle content should It is not more than 0.5%, and air slaking granule must not be mixed into.When carrying out this Concrete, continuous size fraction rubble Φ 5～Φ 10 is used to throw Material.

Through a large amount of tentative contrast tests and with cement compatibility test, the high efficiency water reducing agent selected by this invention is polycarboxylic-acid Concrete high-performance water reducer, its quality should be not less than existing national standards " Technical code for application of admixture in concrete " The regulation requirement of the relevant criterion such as GB50119-2013 and " concrete admixture " GB 8076-2008, selected efficient diminishing The water-reducing rate of agent 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%, use with mixing method, and need to carry out compatibility test with selected cement type before use.

Described defoamer selects AGITAN@P803 powder defoamer.

30nm nano silica fume and the sub-micro silica flour that described silica flour uses mass ratio to be 3:2, its quality should be not less than national standard The regulation requirement of the relevant criterion such as " mineral admixture for high-strength high-performance concrete " GB/T 18736-2002, meanwhile, The moisture content of 30nm nano silica fume and (sub-) SILICA FUME all should be not more than 1%, and loss on ignition all should be not more than 3%, and chloride ion contains Amount all should be not more than 0.01%, and pozzolanic activity index all should be greater than 95%.Wherein, the specific surface area of 30nm nano silica fume should 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%.

I grade of special fine powdered coal of high-quality that the power plant that described flyash uses coal burning process advanced produces.Its quality should be not less than state The regulation requirement of the relevant criterion such as family standard " flyash in cement and concrete " GB/T 1596-2005, and it is thin Degree (0.045mm square hole screen tails over, %) should be not more than 10%, and 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 that this excites by the efficient flyash excitant (FAEA) of inventor place research team independent development The activity that Ultrafine Grinding pulverized burned coal ash hydration mixed with nano silica fume and sub-micro silica flour is reacted by agent excites further, and it is according to following The raw material of mass percent is combined formulated:

The waterglass of inorganic material 65%～73% (utilizes solid sheet NaOH and commercially available sodium silicate water glass to be modulated into mould in proportion Number is about the waterglass of 1.0), 23%～30% common dihydrate gypsum (CaSO₄·2H₂And organic material 3%～5% 3 second O) Hydramine (TEA) is compound formulated.

Preparation method is as follows: first make certain density alkaline solution, then with known by soluble in water for solid sheet NaOH The sodium silicate water glass (between the modulus general 2.4～3.3 of commercial water glass) of modulus is modulated into the test needs that modulus is 1.0 Waterglass, being combined preparation the most again with common dihydrate gypsum and TEA becomes required composite exciting agent (FAEA).

Through test determination, this exciting agent has good phase with early strength silicate cement, poly carboxylic acid series concrete high-performance water reducing agent Capacitive.

The calcium sulphoaluminate class high-efficiency expanding agent being applicable to special high-strength high-performance concrete selected by described extender, and its quality should be not less than The regulation requirement of the relevant criterion such as national standard " cement expansive material " GB23439-2009, and its fineness (0.08mm square hole Sieve tails 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 comprcssive 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%.

Described compound plasticity-maintaining agent selects the composite highly effective plasticity-maintaining agent being applicable to special high-strength high-performance concrete, and this plasticity-maintaining agent includes following The raw material of mass ratio:

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

Described concrete plasticity-maintaining agent is the guarantor of the market sale of the stable in properties with poly-hydroxy acid series high-efficiency water-reducing agent with the preferable compatibility Mould agent；

Described hydroxyl hydroxy acid salt retarder is the one in sodium gluconate, sodium potassium tartrate tetrahydrate, sodium citrate, sodium salicylate；

Described macromolecule economization agent be the comb polymer containing polyoxyalkylene chain, containing the organic polymer of polyethers and aliphatic category, The one in copolymer containing methyl ether based polyalcohol/methyl ether based polyalcohol；

The described comb polymer containing polyoxyalkylene chain is the JM-that Jiangsu Subotexin Material Co., Ltd develops SRA series concrete economization agent, it is mainly composed of alkyl polyoxyethylene ether；

The described organic polymer containing polyethers and aliphatic category is the JSJ type economization agent that Metallurgical Research Institute, Department of Architecture is developed, its Main component is polyethers and aliphatic category Organic substance；

The described copolymer containing methyl ether based polyalcohol/methyl ether based polyalcohol is that the institute of civil engineering of Zhejiang University develops ZZD-A type Economization agent, its main component is methyl ether based polyalcohol and methyl ether based polyalcohol.

Through a large amount of tentative contrast tests and with cement compatibility test, this plasticity-maintaining agent and portland cement and the present invention used by High-performance water reducing agent has the good compatibility.Its quality should be not less than existing national standards, and " concrete admixture application technology is advised Model " regulation of the relevant criterion such as GB50119-2013.

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

The present invention gives the preparation method of the concrete for reinforced concrete composite structure C240 strength grade, the method Using the cement improved to wrap up in sandstone method concrete stirring technology, 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) then according to weight proportion adds 608kg/m in forced mixer³Fluvial sand, 152kg/m³Quartz sand and step Rapid 1) the 1/3 of amount of the mixture, uniform stirring 1～2min；

3) 1293kg/m is added³Φ 5～Φ 10 continuous size fraction rubble coarse aggregate and step 1) amount of the mixture 1/3, all Even stirring 2～4min；

4) it is subsequently added into whole cementing material: 500kg/m³Cement, 51kg/m³Extender, 58.2kg/m³Nano-silicon Powder, 38.8kg/m³Sub-micro silica flour and 123kg/m³Flyash, uniform stirring 3～4min；

5) it is eventually adding 1.4kg/m³Defoamer and remaining step 1) mixture, uniform stirring 2～3min, stop 3 minutes After be stirred for 2～3min to uniformly, discharging, obtain the concrete mix of C240 strength grade.

Described preparation is the concrete mix of C240 for reinforced concrete composite structure strength grade, and its maintenance process is adopted With the steam curing in heating curing, its maintenance flow process is: quiet stop that (4～6 hours) → (programming rate is for the least in the heating that heats up Time 10 DEG C) → heated at constant temperature (relative humidity be more than 95%, 80 DEG C～90 DEG C, 48～72 hours) → cooling heating (cooling speed Degree is per hour 10 DEG C) → standard curing is to 28 days.

The invention has the beneficial effects as follows:

1. the concrete that the present invention produces is a kind of to be applicable to the extra-high strong height that reinforced concrete composite structure strength grade is C240 Performance concrete.This concrete can ensure that mechanical property (i.e. C240 strength grade, plasticity etc.) that it should possess and On the basis of there is high-durability, high workability, high volume stability and economy, be significantly improved this concrete and shaped steel it Between natural adhesive property so that it is apply steel reinforced concrete structure design in exist without (or only needing by detailing requiments a little) Shaped steel surface adds shearing connecting piece, can ensure effective collaborative work of shaped steel and this concrete, thus decrease construction work Sequence, has saved steel, improves efficiency of construction, and avoids to arrange shearing connecting piece on shaped steel surface in a large number and easily cause this and mix The defects such as the solidifying internal congenital microcrack of soil, have significant economic benefit and construction quality improvement effect, and its mechanical property contrasts Result of the test is shown in Table 4.

2. the high efficiency water reducing agent used in the present invention selects poly carboxylic acid series concrete high-performance water reducing agent, and (water-reducing rate should be greater than 30%), comparing other type of water reducer, the compatibility with early strength silicate cement is good, and it does not contains Na₂SO₄, one can be entered Step improves the durability of this concrete.

3. the defoamer used in the present invention selects powder defoamer, and model is AGITAN@P803, can be to concrete-agitating During formed and after vibration compacting, a large amount of microvesicles of remaining in concrete carry out deaeration so that it is degree of compaction is effectively improved, and increases The durability of strong concrete and shear stability.

4. the composite exciting agent used in the present invention selects the alkaline composite exciting agent (FAEA) of independent development, can promote calcium vitriol The generation of stone, makes have certain micro-expansibility mixed with the concrete of flyash and silicon ash, improves the shrinkage of concrete.Logical Cross composite exciting agent by flyash Watch glass body network structure depolymerization, thus excite the lateral reactivity of flyash, powder can be strengthened With the Vitrea corrosiveness of three-D space structure that aluminosilicate is main aquation component during coal ash hydration, improve forward water Close the power of reaction, generate the crystal such as more C-S-H gel, drated calcium aluminate and hydrated calcium silicate, promote that flyash participates in Early hydration process, makes full use of the gap between flyash activity micro aggregates and ball effect and silicon ash filler particles, improves glue The performance of knot material and minimizing water consumption, and secondary hydration product fill concrete internal voids, the morning to institute's concrete batching Phase intensity, later strength and corrosion resistance increase significantly；On the other hand, the effect of composite exciting agent promote silicon ash- The formation of fly ash based mineral polymer, also significantly improves shaped steel and special high-strength and high performance while improving concrete durability Adhesive property between concrete.

5. the present invention produce for the high performance concrete that reinforced concrete composite structure strength grade is C240 be by add Active mineral additives (special fine powdered coal, nano silica fume and sub-micro silica flour), uses equivalent method of substitution to replace part of cement, utilizes The pozzolanic reaction of active mineral admixture, enhancement effect, filling effect, durability improve the temperature of effect and hydration heat of concrete Peak subtractive effect, and make full use of active mineral admixture be combined incorporation and active mineral admixture mix with the compound of high efficiency water reducing agent Close the produced over-superimposed effect of material, according to them with cement granules, coarse-fine aggregate particle diameter not at the feature optimised coagulation of same one-level The grain composition of Binder Materials part in soil material, flyash and silicon ash can the intergranular hole of filling concrete, not only make coagulation Soil gathers materials and the pore structure of interfacial structure between Behavior of Hardened Cement Paste and Behavior of Hardened Cement Paste is all greatly improved, improve Behavior of Hardened Cement Paste Consistency, impermeability, the most typical compact texture can expand to aggregate surface, so that concrete is the most closely knit hard, mixed Mechanical property (adhesive property especially and between shaped steel), endurance quality and the service behaviour of solidifying soil all improve a lot.

6. the nano silica fume used in the present invention, is a kind of nontoxic, tasteless, pollution-free, high-purity, pure nanometer material Material.The particle size of nano silica fume is little, and specific surface area is big, can give full play to its micro-packing effect；Nano silica fume surface exists A large amount of unsaturated residual bonds and the hydrogen-based of different bond styles, or for deviateing the silica structure of steady statue because of anoxia, can consume with Refinement Ca (OH)₂Crystal, promotes hydration rate and degree of hydration, and the hydrated calcium silicate gel making formation is finer and close；Compared to (sub-) SILICA FUME, has higher activity (particularly induced activity) and free energy state, the improvement to concrete microstructure Raising (i.e. C240 strength grade, plasticity etc.) with mechanical property all has no small facilitation, simultaneously to improve shaped steel with Adhesive property between special high-strength high-performance concrete also creates remarkable result.

7. the present invention fills appropriate flyash and can improve concrete and mix and stir the mobility of material, cohesiveness and water-retaining property, but powder Coal ash replaces part of cement can reduce the early strength of concrete to a certain extent, and mixes appropriate silicon ash, is remarkably improved The intensity of concrete and durability, and with hydrolysis product of cement Ca (OH) 2, secondary reaction of hydration can occur, form gelling and produce Thing, filling concrete stone structure, improves the microstructure of slurry, improves mechanical property and the durability of hardenite.Flyash and silicon Being used in conjunction with of ash, can improve concrete substrate degree of compaction, thus improve the adhesive property between shaped steel and concrete.

8. the extender used in the present invention, is a kind of calcium sulphoaluminate class concrete high-efficiency expanding agent.Calcium sulphoaluminate class concrete High-efficiency expanding agent generates entringite swelling water compound crystal (C with hydrate₃A·3CaSO₄·32H₂O), can prevent or reduce mixed Chemical reaction in solidifying soil aquation, hardening, physical reactions and the volume contraction cracking caused by thermodynamical reaction compensate, and energy Fill, block various capillary slit and make concrete inner structure finer and close, not only substantially increase the anti-crack and anti-seepage of concrete Energy and volume stability, and the density of concrete and intensity can be made to be further improved.

9. the plasticity-maintaining agent used in the present invention, is that one is subtracted by concrete high-efficiency plasticity-maintaining agent, mineral acid salt retarder, macromolecule Contracting agent is combined formulated composite highly effective plasticity-maintaining agent.This efficient plasticity-maintaining agent can effectively slow down the water of cement granules when appropriate admixture Change, therefore there is high slump holding capacity, and make the early-age shrinkage rate of special high-strength high-performance concrete decrease, contribute to Improve the crack resistance of concrete, thus enhance the durability of concrete；With under the common effect of high-performance water reducing agent, not only The shortcoming that the early strength of concrete is relatively low can be improved, moreover it is possible to the mechanical property significantly improving type steel performance (is moulded Property, adhesive property etc. between comprcssive strength, shaped steel and concrete).

10. the quartz sand used in the present invention is a kind of hard, wear-resisting, silicate mineral of stable chemical performance.Its main mine Thing composition is silicon dioxide, has certain acid-resisting erosion medium resistance ability, it is possible to make up the shortcoming ginseng that fluvial sand is inert material With hydration reaction reduce the heat of hydration, improve durability and the intensity of concrete.

11. the present invention produce for the special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240 be Under normal concrete manufacturing condition, and employing reduces cement granules, additive granule and superfine active mineral grain as far as possible The cement flown upward everywhere when concrete-agitating wraps up in the feeding method realization of sandstone stirring technique, and preparation technology is simple and is prone to real Existing, it is suitable for through engineering approaches and industrialization, it is simple to large-scale promotion application, there is preferable social benefit.

12. present invention produce for special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240 Containing substantial amounts of flyash, silica flour in raw material, they are industrial waste and garbage, its dissolve environmental conservation can be made huge Big contribution, meets the requirement of sustainable development, is a kind of green concrete, a kind of environment-friendly material.

The raw material (including industrial waste) that 13. present invention select is a large amount of, the market circulation of large-scale production, buys and sell product, Raw material is easy to get.

Steam heating curing employed in 14. present invention can accelerate cement and active mineral admixture hydration reaction process and The performance of volcano ash effect, can improve concrete microstructure, improves its interfacial adhesion and intensity.It addition, concrete or The steam heating curing technology of concrete component is the most ripe, and easily grasps, and the popularization and application for this invention are laid a good foundation.

15. the present invention produce for the special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240 be Disastrously expect (superfined flyash and Ultrafine Grinding silica flour) by adding superfine active mineral, use equivalent method of substitution to replace part of cement, The pozzolanic reaction of active mineral admixture, enhancement effect, filling effect, durability is utilized to improve effect and special high-strength and high performance The warm peak subtractive effect of hydration heat of concrete, and make full use of the compound incorporation of active mineral admixture and active mineral admixture with high Over-superimposed effect produced by the composite blend of effect water reducer, according to them with cement granules, coarse-fine aggregate particle diameter not same The feature of level optimizes the grain composition of Binder Materials part in extra-high strong high-performance concrete material, in this proportioning, aggregate accounting About 75%, suitably reduce sand coarse aggregate ratio, i.e. improve rubble accounting；Not only make special high-strength high-performance concrete gathers materials and Behavior of Hardened Cement Paste Between interfacial structure and the pore structure of Behavior of Hardened Cement Paste all greatly improved, improve the consistency of Behavior of Hardened Cement Paste, impermeability, Simultaneously typical compact texture can expand to aggregate surface so that special high-strength high-performance concrete is the most closely knit hard, extra-high by force Mechanical property (adhesive property especially and between shaped steel), endurance quality and the service behaviour of high performance concrete all have the biggest Raising.

The present invention is with under naturalness (that is shaped steel surface is not provided with or only arranges a small amount of shearing connecting piece by detailing requiments) Significantly improve the adhesive property between shaped steel and concrete, effectively play steel and the respective mechanics of concrete bi-material and collaborative work Make performance, thus the significantly bearing capacity of lift structure component and performance, and the durability improving structure is objective, studies Technology of preparing for special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240.At present, domestic The outer quality making special portland cement used by high-strength high-performance concrete and intensity are more and more higher, active mineral admixture used The process technology of (silica flour, flyash etc.) is updated with quality, in addition high-performance water reducing agent, high-efficiency expanding agent, efficiently protect Mould the research of the concrete admixtures such as agent and apply all achieved with bigger progress, and defoamer and exciting agent are in concrete Study and the most progressively develop with application, thus the realization for the studies above objective identifies basis.Meanwhile, special high-strength and high performance mixes The cement consumption of the requirement of solidifying soil is relatively fewer, and produces cement and mean a large amount of discharges of carbon dioxide, therefore in certain journey The greenhouse effect that the earth is caused is alleviated on degree；It requires there is sufficient amount and accounts for the bigger flyash of cementing material proportion, silicon The active mineral additives of the high-qualitys such as powder, it is meant that the reasonable treatment and use of industrial waste, is beneficial to form good production cycle And environmental conservation, and the active mineral additives of these high-qualitys improves required for concrete material self performance just.In a word, should With special high-strength high-performance concrete can save cement, industrial waste is turned waste into wealth, extending structure engineering service life, and Preserve the ecological environment eventually and natural resources.In sum, for the special high-strength high-performance concrete of reinforced concrete composite structure Research and development are by for preferably using concrete to walk out the road of a sustainable development, and it is comprehensive by lift structure engineering Ability and performance, promote steel-concrete combined structure in China, especially highlight lines and the high level in frequently occurred earthquake area, super/extra-high Layer building, offshore platform or submerged structure, hypogee, popularization and application in super/Super-Long Span, super/extra-heavy duty type structure, improve base The scientific and technological content of building structure in Infrastructure and human settlement, and play it there is bigger bearing capacity and rigidity, good anti- Shock stability, construction speed are fast, durable and fire resistance is good and the significant unique advantage such as Social and economic benef@.Therefore, shaped steel is special High-strength high-performance concrete combinative structure has the highest engineer applied and is worth and wide market prospect.

Detailed description of the invention

The present invention develop for the special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C240, except Outside using similar material cement, sand, rubble, water with normal concrete, it is also added into its indispensable component: coagulation Soil high-performance water reducing agent, concrete high-efficiency expanding agent and active mineral admixture (silica flour, flyash), be the most also mixed with powder End 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 Can the most commonly 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 typically more than 0.30, spy's high-strength high-performance concrete Maximum size of coarse aggregate is also smaller than common and high-strength concrete.Above-mentioned every difference result in special high-strength high-performance concrete with general Logical and high-strength concrete has the biggest difference in performance, disastrously expects by adding superfine active mineral, utilizes superfine active mineral The pozzolanic reaction of spike, (micro-) filling effect and plasticization effect, optimize Binder Materials in extra-high strong high-performance concrete material The grain composition of part, not only makes to gather materials in special high-strength high-performance concrete and interfacial structure between Behavior of Hardened Cement Paste and Behavior of Hardened Cement Paste Pore structure is all greatly improved, and improves the consistency of Behavior of Hardened Cement Paste, impermeability, and the most typical compact texture can expand to Aggregate surface, so that special high-strength high-performance concrete is the most closely knit hard, the mechanical property of special high-strength high-performance concrete is (outstanding It is the adhesive property between shaped steel) and endurance quality all improve a lot.Meanwhile, by the incorporation of powder defoamer, Can reduce and be formed and remain on after vibration compacting in concrete in cement slurry during concrete-agitating or cement slurry and bone A large amount of bubbles of the transition zone, interface between material carry out deaeration so that it is degree of compaction is effectively improved, to special high-strength high-performance concrete The raising of mechanical property (including the adhesive property between shaped steel) and endurance quality is all made that no small contribution.It addition, it is logical Cross the admixture of exciting agent, concrete can be made to have certain micro-expansibility, improve the shrinkage of concrete；Fine coal can be strengthened Buck and during with the Vitrea corrosiveness that aluminosilicate is main aquation component, increase the activity of flyash, just improving To the power of hydration reaction, generate the crystal such as more C-S-H gel, drated calcium aluminate and hydrated calcium silicate, mixed to being prepared Intensity and the corrosion resistance of solidifying soil increase significantly.And the admixture of concrete high-efficiency expanding agent, concrete hardening can be reacted Produced volume contraction cracking compensates, and the various capillary slit can filled, block in concrete improve concrete Anti-crack and anti-seepage performance, density, intensity and volume stability.For high-performance water reducing agent and the admixture of composite highly effective plasticity-maintaining agent, Decrease cement water consumption, cement granules had certain dispersion and wetting action, make the early-age shrinkage rate of concrete decrease, It is effectively reduced carrying out of early cracks of concrete, the shortcoming that the early strength of concrete is relatively low can not only be improved, moreover it is possible to be aobvious The durability of work raising type steel performance and mechanical property are (between plasticity, comprcssive strength, shaped steel and concrete Adhesive property etc.).

With bonding between plain bar to concrete is similar, the cohesive force between shaped steel and concrete is also main by chemical bond Power, frictional resistance and mechanical snap power three part composition.Each ingredient of the cohesive force between shaped steel and concrete is all with mixed The performance of solidifying soil is closely related.

Chemical bond power is the chemical adhesion strength that produces on shaped steel surface of the cement gel body in concrete or absorption affinity, its (shearing resistance) Ultimate value depends on character and the degree of roughness on shaped steel surface of cement.During casting concrete, cement slurry produces at steel surface Surface tension, under capillary effect, the cement slurry on steel surface will form self-balancing；Cast concrete is typically wanted Vibrating, power of vibrating (disturbance) can strengthen and accelerate the cement slurry infiltration to steel surface oxide layer；In maintenance processes Middle cement slurry crystallizes, and cement crystal forms chemical bond power.Chemical bond power is only in the original shape of Steel Reinforced Concrete Members Existing under one-tenth state, (locally) bond-slip on joint face once occurs, cement crystal will be cut off and attrition crushing, Chemical bond power is then lost.The principal element affecting chemical bond power has concrete strength, shaped steel steel surface degree of roughness, examination Part pours the contraction situation etc. of mode and the degree of vibrating and the maintenance in later stage and concrete.

After chemical bond power is lost, due to the steel surface changed condition caused by the rough of steel surface and other reason (steel surface is uneven) so that it is be interlocked with the concrete crystal grain on contact surface, material is thus formed machinery Gmatjpdumamics.For shaped steel such as the rolled steel joists that plant produced postmenstruation process, once bond-slip development is accelerated, shaped steel with The crushed integration of concrete crystal on concrete surface, at this moment mechanical snap power also substantial loss.Affect mechanical snap power The degree of roughness that principal element is shaped steel steel surface and surface appearance (corrosion degree etc.), aggregate grating, coagulation Soil intensity and the force way etc. of Steel Reinforced Concrete Members.

Shaped steel surrounding concrete is also formation after the bond failure between shaped steel and concrete to the frictional resistance of shaped steel, and mainly It is just to play a role after mechanical snap power is lost substantially.When chemical bond power, especially mechanical snap power lose after, due to Concrete crystal on shaped steel contact surface is cut off, crushed and is expanded, and the lateral confinement such as protective layer and stirrup in addition will be at shaped steel With generation normal pressure on the joint face of concrete, add that on joint face, coefficient of friction is relatively big, thus define frictional resistance.Friction Resistance the most all exists after chemical bond power is lost, and is the major part of later stage cohesive force between shaped steel and concrete.Impact Being subject to because have the size of adhesive surface, component between shaped-steel layout and surface character, shaped steel and the concrete of shaped steel of frictional resistance Power mode, aggregate grating and to affect the factor of lateral confinement (thickness of concrete cover of shaped steel, stirrup ratio, mixed Solidifying soil shrinks) etc..

Key technical problem to be solved by this invention is, in the mechanical property guaranteeing that special high-strength high-performance concrete should possess (i.e. intensity and plasticity) and on the basis of there is high-durability, high workability, high volume stability and economy, significantly Improve (naturally) adhesive property between concrete and shaped steel, make in steel reinforced concrete structure design without (or only needing by structure Make requirement a little) add shearing connecting piece on shaped steel surface, can ensure to have between shaped steel and concrete bonding and anchor reliably Gu, make both harmonious, cooperation of energy under load action.

The present invention, from principle and design principle, breaks the restriction of " full sieve rice " formula, by orthogonal experiment and contrast experiment Method, it is considered between concrete high-performance water reducer, concrete high-efficiency expanding agent, defoamer, exciting agent, efficient plasticity-maintaining agent And with the compatibility of cement, between maximum size of coarse aggregate, coarse aggregate different-grain diameter and and fine aggregate particle diameter between grating (micro-) performance factor such as filling effect, pozzolanic activity on concrete strength and the impact of performance and active mineral additives, Select high-quality coarse-fine aggregate and control particle diameter and grating, in special high-strength high-performance concrete its preparing materials, mixing appropriate concrete High-performance water reducing agent, concrete high-efficiency expanding agent, concrete composite highly effective plasticity-maintaining agent and high-quality active mineral micropowder, and consider Defoamer and the addition of exciting agent, reduce the ratio of mud, based on the local existing material that is easy to get, does not change conventional production process, For reduce as far as possible cement granules, additive granule and superfine active mineral grain when concrete-agitating everywhere fly upward employing cement wrap up in The feeding method of sandstone stirring technique, utilize the pozzolanic reaction of active mineral admixture, enhancement effect, (micro-) filling effect, Durability improves effect and the warm peak subtractive effect of the special high-strength high-performance concrete heat of hydration, and makes full use of active mineral admixture Over-superimposed effect, froth breaking produced by the composite blend of compound incorporation and active mineral admixture and concrete high-performance water reducer The deaeration effect of agent, compensating of extender are shunk and filling effect, the activity excitation effect of exciting agent, composite highly effective plasticity-maintaining agent Guarantor moulds and reduces and deferred action, make that mechanical property (adhesive property especially and between shaped steel) is good, service behaviour is excellent, Excellent in durability, the spy that the strength grade be applicable to reliability application steel reinforced concrete structure is C240 of advantage of lower cost High-strength high-performance concrete.The mechanical property test comparing result of the present invention is as shown in table 4.

When the present invention selects raw material, not requiring nothing more than raw material is high-quality, also requires used by the special high-strength high-performance concrete of preparation Raw material is that locality is easy to get.Furthermore, it is contemplated that the intensity of institute's concrete batching is the highest, theoretical to concrete according to maximum density In material, the grain composition of coarse-fine aggregate is optimized, and makes large or fine granule have mutually good filling, to reduce the space of aggregate Rate；Meanwhile, the mean diameter of general cement is 20～30 μm, the most few less than the granule of 10 μm, and active mineral admixture Grain diameter tiny more than cement granules particle diameter, the mean diameter of superfined flyash is 3～6 μm, can filling concrete granule it Between space, the mean diameter of SILICA FUME is the least, is 0.10～0.26 μm, can filling concrete granule and superfined flyash granule Between and superfined flyash particle between space, the mean diameter of nanometer SILICA FUME is less, for 10nm～0.1 μm, can fill out Fill between gel particles and and interfacial structure between fine gap or space, so at the special high-strength and high performance coagulation prepared In soil material, the grain composition to Binder Materials part is optimized most important.And the outside deterioration factor (as sulfate etc. because of Son) aggressivity of concrete is heavily dependent on the pore structure of concrete, and this causes concrete durability to ask just The main cause of topic.The incorporation of active mineral admixture, reduces between cement granules and the voidage at interface, makes Behavior of Hardened Cement Paste tie Structure and interfacial structure are the finest and close, have blocked the permeation pathways being likely to be formed, so that the special high-strength high-performance concrete prepared Impermeability increase substantially, water and other various etching medium (CL^-、SO4^2-, CO2 etc.) be all difficult to enter in concrete Portion, and the occurrence probability of Alkali-silica reaction and the generation probability of calcium hypochlorite can be reduced, its intensity and endurance quality obtain significantly Improve.I.e. when in water mudrock structure and interfacial structure relatively low more than the macropore content of 0.1 μm time, be beneficial to prepared extra-high by force The improvement of the properties of high performance concrete, otherwise, to prepared the special intensity of high-strength high-performance concrete, anti-permeability performance, Corrosion resistance and endurance quality are the most unfavorable.

After replacing part of cement with active mineral admixture, it is also possible to make the portion of water in cement granules space be filled in it Mineral admixture cement out, the fluidity of cement paste can be made to increase.But the most not all mineral admixture all has This significant plasticization effect, the specific surface area mainly due to amount of activated mineral admixture is too big or itself has porous Structure, although it can displace the portion of water in cement paste after replacing cement, but owing to itself water suction or moistening surface need Want more free water, cause the mobility of cement paste not increase.In order to ensure to be developed the height of special high-strength high-performance concrete Service behaviour, the present invention uses the method that concrete high-performance water reducer and active mineral admixture are combined incorporation, in both associations With under work, the subparticle of active mineral additives has not only given full play to their (micro-) filling effect, and will be filled in sky Moisture among gap cements out, and between making between granule, water barrier thickeies；It addition, the subparticle of active mineral admixture is inhaled Attached concrete high-performance water reducer molecule, electrostatic repulsion produced by the electric double layer current potential that its surface is formed more than powder particle it Between gravitation, promote powder granule to disperse, and be further exacerbated by the dispersion of cement granules, make the mobility of cement paste increase Add, thus effectively improve the mobility of compound；Meanwhile, the compound incorporation of super fine active mineral admixture reduces aquation Heat, can improve the volume stability of concrete.

Aggregate in the raw material preparing special high-strength high-performance concrete should have higher inherent strength, toughness and stablize Property, so that various static state and dynamic stress, impact and corrasion can be resisted, without causing under concrete batching performance Fall.Owing to the apparent condition of different aggregates is different, the adhesion strength between cement slurry and aggregate is caused also to differ, usual feelings Under condition, rubble has higher adhesion strength compared with cobble；On the other hand, the asynchronous adhesion strength of silicon ash content ratio in cement slurry Difference is the biggest, and during mixing silica, the adhesion strength between cement slurry and aggregate is more much higher than when not mixing.Normal concrete is broken In bad time, cement slurry is weak link with the bonding interface of aggregate, and crack is the interface appearance along cement slurry with aggregate , aggregate typically will not destroy, and extraneous erosion also tends to start development from this interface, and in special high-strength high-performance concrete Cement slurry is no longer weak link with the bonding interface of aggregate, and its destruction is also no longer along interface and occurs, but due to aggregate Destruction and cause, therefore the performance of aggregate has large effect to the performance of special high-strength high-performance concrete.The present invention grinds Study carefully the fine aggregate of selection use that granule is round and smooth, quality is hard, grating is good, clay content little in thick fluvial sand；Coarse aggregate is table The artificial rubble with granite, basalt as main component that face is coarse, fine quality, grating is good, its maximum particle diameter should be controlled System is at 10mm.So, the uniformity of concrete has been got back further lifting, so that concrete is more closely knit, intensity Also can be further enhanced.

The present invention uses cement to wrap up in sandstone method (the SEC method also known as improving) concrete stirring technology in the preparation, stirs at forced action type Mixing in machine and be stirred, its feeding sequence is: first poly carboxylic acid series concrete high-performance water reducing agent, exciting agent and composite highly effective are protected Mould agent uniformly to admix in load weighted water, obtain mixture；It is subsequently adding fine aggregate and is mixed with high-performance water reducing agent and exciting agent and mixes The 1/3 of compound total amount → stir (1～2 minute) → addition coarse aggregate and be mixed with high-performance water reducing agent and exciting agent mixture The 1/3 of total amount → stir (2～4 minutes) → add whole cementing material (cement, extender, silicon ash and flyash) → stir (3～4 minutes) → addition defoamer and residue are mixed with high-performance water reducing agent and exciting agent mixture → uniform stirring (2～3 minutes) → stop was stirred for uniformly (2～3 minutes) → discharging after 3 minutes.This technique can reduce cement as far as possible Granule and superfine active mineral grain fly upward everywhere when concrete-agitating, and can improve the intensity of prepared concrete, and made Should not there is segregation phenomenon in standby concrete, and bleeding is few, and service behaviour is preferable.

The present invention uses the steam curing in heating curing when maintenance, and its maintenance flow process is: quiet stop (4～6 hours) → heat up Heating (programming rate be 10 DEG C per hour) → heated at constant temperature (relative humidity more than 95%, 80 DEG C～90 DEG C, 48～72 hours) → cooling heating (cooling rate is 10 DEG C per hour) → standard curing was to 28 days.This maintenance process can accelerate cement and work The process of property mineral admixture hydration reaction and the performance of volcano ash effect, can improve concrete microstructure, improve its interface Cohesive force and intensity.

Embodiment:

(1) raw material

1. cement

Select steady quality, the Qinling Mountains board P I 62.5R cement of better performances, subtract with poly carboxylic acid series concrete high-performance before using Water preparation carries out compatibility test between the two, and test method uses existing building material industry standard, and " cement tries with water reducer compatibility Proved recipe method " method in JC/T 1083-2008, good with the poly carboxylic acid series concrete high-performance water reducing agent compatibility.Selected cement Performance indications meet the requirement of the national existing relevant criterion such as " portland cement, Portland cement " GB175-2007, its Alkali content is few, the heat of hydration is low, water requiremen is the lowest.

2. aggregate

3. sand and the quartz sand using mass ratio to be 8:2.

Sand uses that granule is round and smooth, quality is hard, grating good in partially thick, Ba fluvial sand, the quality of sand meets existing building material industry Standard " regular concrete sand, stone quality and test method standard " JC/T 52-2006 and national standard " building sand " GB/T The high-quality sand standard of regulation in 14684-2011.Its modulus of fineness is 3.0, clay content and clod content all control 0.3% (with Quality meter) below, chloride ion content controls in 0.02% (in terms of the quality of dry sand) below, SO₃Content should be not more than 0.5%.

Select the quartz sand that quality is consummate, grating is good.Its dioxide-containing silica should be not less than 99%, and ferric oxide content should Being not more than 0.005%, the metals content impurity such as chromium, titanium should be not more than 0.01%.When carrying out this Concrete, use different grain Footpath specification (2-4mm, 1-2mm, 0.63-1mm, 0.315-0.63mm, 0.16-0.315mm, < 0.16mm) many gratings throw Material.

4. flyash

I grade of special fine powdered coal of high-quality that the power plant using coal burning process advanced produces.Its quality meets national standard " for cement With the flyash in concrete " the regulation requirement of the relevant criterion such as GB/T 1596-2005, its fineness (0.045mm square hole screen Tail 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

30nm nano silica fume and the sub-micro silica flour using mass ratio to be 3:2, the 30nm nano silica fume of selection and (sub-) SILICA FUME Quality meet the rule of the relevant criterion such as national standard " mineral admixture for high-strength high-performance concrete " GB/T 18736-2002 The moisture content of provisioning request, 30nm nano silica fume and (sub-) SILICA FUME is respectively less than 1%, loss on ignition no more than 3%, chloride ion 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 fume is about 42000m²/ kg, silicone content is not less than 99.9%；The specific surface area of (sub-) micron silica flour is about 27000m²/ kg, silicon dioxide Content is not less than 99%.

6. concrete high-performance water reducer

Through a large amount of tentative contrast tests and with cement compatibility test, the high efficiency water reducing agent selected by this invention is polycarboxylic-acid Concrete high-performance water reducer, its quality meets the relevant criterion such as existing national standards " concrete admixture " GB 8076-2008 Regulation requirement, the water-reducing rate of selected high efficiency water reducing agent be more than 30%.The maximum doping quantity of selected high efficiency water reducing agent is whole glue The 2.5% of gel material total amount, uses with mixing method, carries out compatibility test with selected cement type and the compatibility is good before using Good.

7. exciting agent

Select by the efficient flyash excitant (FAEA) of inventor place research team independent development, be through to mixed with receiving Rice silica flour and the research of Ultrafine Grinding pulverized burned coal ash hydration reaction characteristics of sub-micro silica flour also are recognized its activity to need further to excite and profit On the basis of with, by inorganic material 65%～75% waterglass (utilize solid sheet NaOH and commercially available sodium silicate water glass by than Example is modulated into the waterglass that modulus is about 1.0), 23%～30% common dihydrate gypsum (CaSO₄·2H₂O) and organic material 3%～ 5% triethanolamine (TEA) is compound formulated.Preparation method is as follows: first make one by soluble in water for solid sheet NaOH Then and the sodium silicate water glass (between the modulus general 2.4～3.3 of commercial water glass) of known modulus the alkaline solution of concentration is determined, Being modulated into the waterglass that the test that modulus is 1.0 needs, being combined preparation the most again with common dihydrate gypsum and TEA becomes required Composite exciting agent (FAEA), refers to table 1.Through test determination, this exciting agent and early strength silicate cement, polycarboxylic-acid coagulation Soil high-performance water reducing agent has the good compatibility.

The different ratio of table 1 FAEA exciting agent

8. extender

Through a large amount of tentative contrast tests and with cement compatibility test, the extender selected by this invention for be applicable to extra-high by force The calcium sulphoaluminate class concrete high-efficiency expanding agent of high performance concrete, its quality meets national standard " cement expansive material " GB The regulation requirement of the relevant criterion such as 23439-2009, and its fineness (0.08mm square hole screen tails over, %) no more than 10%, than Surface area is about 400m²/ kg, limited expansion rate (in water 7 days) is not less than 0.05%, and 28d comprcssive strength is more than 55MPa, Content of MgO is not more than 2%, and alkali content is not more than 0.3%.

8. plasticity-maintaining agent

Selecting the composite highly effective plasticity-maintaining agent being applicable to special high-strength high-performance concrete, this plasticity-maintaining agent includes the raw material of following mass ratio:

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

Wherein, concrete plasticity-maintaining agent is the market sale of the stable in properties with poly-hydroxy acid series high-efficiency water-reducing agent with the preferable compatibility Plasticity-maintaining agent.Hydroxyl hydroxy acid salt retarder is the one in sodium gluconate, sodium potassium tartrate tetrahydrate, sodium citrate, sodium salicylate. Macromolecule economization agent is the comb polymer containing polyoxyalkylene chain, containing the organic polymer of polyethers and aliphatic category, containing methyl ether base One in the copolymer of polymer/methyl ether based polyalcohol.

Wherein, the comb polymer containing polyoxyalkylene chain is the JM-that Jiangsu Subotexin Material Co., Ltd develops SRA series concrete economization agent, it is mainly composed of alkyl polyoxyethylene ether；Containing the organic polymer of polyethers and aliphatic category The JSJ type economization agent developed for Metallurgical Research Institute, Department of Architecture, its main component is polyethers and aliphatic category Organic substance；Containing methyl ether The copolymer of based polyalcohol/methyl ether based polyalcohol is that the institute of civil engineering of Zhejiang University develops ZZD-A type economization agent, and it mainly becomes Divide is methyl ether based polyalcohol and methyl ether based polyalcohol.

The different ratio of table 2 plasticity-maintaining agent

9. mixing water

Selection tap water is mixing water, and its quality meets Minstry of Housing and Urban-Rural Development of People Republic of China's ministerial standard " concrete mixing water supply standard " JGJ 63- The regulation requirement of the relevant criterion such as 2006, and alkali content is less than 800mg/L.

(2) match ratio

The present invention carries for the special high-strength high-performance concrete that the strength grade will applied in steel reinforced concrete structure is C240 The match ratio of confession is as shown in table 3.

Table 3 is for extra-high strong high-performance concrete mix (unit: the kg/m of reinforced concrete composite structure³)

(3) stirring technique

This invention uses cement to wrap up in sandstone method concrete stirring technology, 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/m³With composite highly effective plasticity-maintaining agent 0.6kg/m³Uniformly admix load weighted water 101kg/m³In, obtain mixture；Then according to weight proportion is at forced mixer Middle addition 608kg/m³Fluvial sand, 152kg/m³Quartz sand and be mixed with high-performance water reducing agent, exciting agent and composite highly effective plasticity-maintaining agent The 1/3 of amount of the mixture, uniform stirring 1～after 2 minutes, add 1293kg/m³Coarse aggregate (Φ 5～Φ 10 continuous size fraction is broken Stone) and it is mixed with high-performance water reducing agent, exciting agent and the 1/3 of composite highly effective plasticity-maintaining agent amount of the mixture, uniform stirring 2～4 minutes After, add whole cementing material (including extender): 500kg/m³Cement, 51kg/m³Extender, 58.2kg/m³ Nano silica fume, 38.8kg/m³(sub-) SILICA FUME and 123kg/m³Flyash, uniform stirring 3～after 4 minutes, add 1.4kg/m³AGITAN@P803 powder defoamer and residue be mixed with the mixture of high-performance water reducing agent and exciting agent, uniformly stir Mix 2～3 minutes, be stirred for after having a rest 3 minutes 2～3 minutes to uniformly, discharging, the concrete obtaining C240 strength grade is mixed Compound.

This technique can reduce cement granules, additive granule and superfine active mineral grain as far as possible and fly everywhere when concrete-agitating Raising, and can improve the intensity of prepared concrete, and segregation phenomenon should not occur in prepared concrete, bleeding is few, workability Can be preferable.

(4) maintenance process

This invention uses the steam curing in heating curing, and concrete maintenance flow process is as follows:

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

This maintenance process can accelerate cement and the process of active mineral admixture hydration reaction and the performance of volcano ash effect, can change The microstructure of kind prepared concrete, improves its interfacial adhesion and intensity.

(5) mechanical property test Comparative result

The strength grade being applicable to reinforced concrete composite structure prepared according to above-mentioned match ratio is the extra-high strong high property of C240 Can concrete and the mechanical property comparative test result such as table 4 of general super high strength concrete (strength grade is the concrete of C240) Shown in.

Table 4 mechanical performance of concrete comparative test result

From table 4, it can be seen that the special high-strength high-performance concrete that strength grade is C240 prepared by this technology, it is achieved that Can ensure that its mechanical property that should possess (i.e. C240 strength grade, plasticity etc.) and have high-durability, high reliability, On the basis of high workability, high volume stability and economy, (naturally) bonding being significantly improved between concrete and shaped steel Performance, adhesion strength improves 1.78 times.Make in steel reinforced concrete structure designs without (or only needing by detailing requiments a little) Add shearing connecting piece on shaped steel surface, effective collaborative work of shaped steel and concrete can be ensured, thus decrease construction work Sequence, has saved steel, improves efficiency of construction, and avoids and arrange shearing connecting piece in a large number on shaped steel surface and easily cause coagulation The defects such as the internal congenital microcrack of soil, can bring significant economic benefit and construction quality improvement effect, have higher engineering Using value and wide market prospect.

Claims

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

A kind of concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, it is special Levy and be, described fine aggregate uses mass ratio to be that the ratio granule of 8:2 is round and smooth, quality is hard, grating good in partially thick fluvial sand The high grade quartz sand consummate with quality, grating is good；Its modulus of fineness is between 2.8～3.2；By quality ratio, its clay content 0.3% should be not more than with clod content；In terms of the mass ratio of dry sand, its chloride ion content should be not more than 0.02%, SO₃Content should It is not more than 0.5%；In quartz sand, dioxide-containing silica should be not less than 99%, and ferric oxide content should be not more than 0.005%, Chromium, titanium impurity content should be not more than 0.01%.

A kind of concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, it is special Levying and be, quality densification is hard, intensity is high, rough surface, particle shape are almost spherical, elongated particles for the employing of described coarse aggregate The artificial rubble with basalt, granite as main component that little, grating is good, throws according to continuous size fraction rubble Φ 5～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 control at 10mm；With Mass ratio 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-like particle content should be not more than 0.5%, and must not be mixed into air slaking granule.

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

A kind of concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, it is special Levying and be, described cement selects P I 62.5R portland cement；

Described defoamer selects AGITAN@P803 powder defoamer.

Concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, its feature exists In, described silica flour employing mass ratio is 30nm nano silica fume and the sub-micro silica flour of 3:2,30nm nano silica fume and sub-micro silica flour Moisture content 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%, pozzolanic activity Index all should be greater than 95%；Wherein, the specific surface area of 30nm nano silica fume should be not less than 40000m²/ kg, silicone content should not be little In 99.9%；The specific surface area of submicron silica flour should be not less than 25000m²/ kg, dioxide-containing silica should be not less than 95%；

Described flyash uses I grade of special fine powdered coal of high-quality, and 0.045mm square hole screen tails over and should be not more than 10%, and its loss on ignition should It is not 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 Should be greater than 700m²/kg。

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

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

Described waterglass is utilize solid sheet NaOH and commercially available sodium silicate water glass to be modulated in proportion water glass that modulus is 1.0 Glass.

Concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, its feature exists In, calcium sulphoaluminate high-efficiency expanding agent selected by described extender, and 0.08mm square hole screen tails over and should be not more than 10%, its specific surface area Should be greater than 300m²/ kg, in water, 7 days limited expansion rates should be not less than 0.05%, and 28d comprcssive strength should be not less than 50MPa, Content of MgO should be not more than 3%, and alkali content should be not more than 0.5%.

Concrete for reinforced concrete composite structure C240 strength grade the most according to claim 1, its feature exists In, described compound plasticity-maintaining agent is composite highly effective plasticity-maintaining agent, and this plasticity-maintaining agent includes the raw material of following mass ratio:

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

The described organic polymer containing polyethers and aliphatic category is JSJ type economization agent；

The described copolymer containing methyl ether based polyalcohol/methyl ether based polyalcohol is ZZD-A type economization agent.

10. it is used for the preparation method of the concrete of reinforced concrete composite structure C240 strength grade, it is characterised in that the party Method uses the cement improved to wrap up in sandstone method concrete stirring technology, and concrete technology step is as follows: