CN103553460A - C200 strength-grade concrete for formed steel concrete composite structure - Google Patents

C200 strength-grade concrete for formed steel concrete composite structure Download PDF

Info

Publication number
CN103553460A
CN103553460A CN201310493466.5A CN201310493466A CN103553460A CN 103553460 A CN103553460 A CN 103553460A CN 201310493466 A CN201310493466 A CN 201310493466A CN 103553460 A CN103553460 A CN 103553460A
Authority
CN
China
Prior art keywords
concrete
strength
content
cement
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201310493466.5A
Other languages
Chinese (zh)
Other versions
CN103553460B (en
Inventor
郑山锁
王帆
侯丕吉
王斌
李磊
郑捷
孙龙飞
杨威
秦卿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Architecture and Technology
Original Assignee
Xian University of Architecture and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Architecture and Technology filed Critical Xian University of Architecture and Technology
Priority to CN201310493466.5A priority Critical patent/CN103553460B/en
Publication of CN103553460A publication Critical patent/CN103553460A/en
Application granted granted Critical
Publication of CN103553460B publication Critical patent/CN103553460B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a C200 strength-grade concrete for a formed steel concrete composite structure, which is composed of 473 parts of cement, 846 parts of fine aggregate, 1054 parts of coarse aggregate, 98.8 parts of water, 19.6 parts of concrete superplasticizer, 1.1 parts of defoaming agent, 84 parts of silicon powder, 123 parts of expanding agent, 7.2 parts of activator and 40 parts of expanding agent. The preparation method comprises the following steps: blending the concrete superplasticizer and activator into weighed water to obtain a mixture, sequentially adding the fine aggregate and 1/3 of the mixture into a stirrer according to parts by weight, and stirring; adding the coarse aggregate and 1/3 of the mixture, and stirring; adding the cement, expanding agent, silicon powder and fly ash, and stirring; and adding the defoaming agent and the rest of mixture, stirring and discharging. The concrete can obviously improve the bonding property between the formed steel and the concrete in a natural state, effectively displays the respective mechanical properties and the synergic working performance of the steel and concrete, greatly enhances the loading capacity, service performance and durability of the structural member, and has high volume stability and economical efficiency.

Description

A kind of concrete for reinforced concrete composite structure C200 strength grade
Technical field
The invention belongs to building material technical field, relate to a kind of surpass/special high-strength high-performance concrete that is C200 for reinforced concrete composite structure strength grade.
Background technology
The invention of portland cement in 1824 makes concrete technology obtain rapidly development, and its consumption is big, the scope of application extensively may occupy the first in the world.Although concrete is a kind of traditional manufactured construction materials, but because it has the continuous progress of the superiority do not replaced (abundant raw material, production technique are simple, cost performance advantages of higher) and concrete material science and technology, concrete has become the main body of material for civil engineering work, will be also one of indispensable main material in following civil engineering work and nation-building.Simultaneously, continuous expansion along with city size, being on the increase of population, the continuous rising of land price, build harshization of environment of living in, continuous progress and the rapid development of economy of Building technology, buildings is more and more in the air, in underground and water, extend, build super/extra-high-speed, super/Super-Long Span, undergroundization, the development of lightweight and heavy type structure, especially steel reinforced concrete structure is in super/extra-high-speed, super/Super-Long Span, undergroundization, sea or under water change, the application of the novelties such as lightweight or megaplex engineering field, requirement to this material of construction of concrete is also more and more higher.Therefore, the research and practice of concrete surpass/extra-high-speed strengthening and super/special durableization 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 combined structure, due to series of advantages such as its supporting capacity is high, rigidity is large, ductility is good, anti-seismic performance is superior, fire retardant anticorrosion, constructabilities, be applied to more and more widely greatly across, heavy type structure, underground, under water or high-rise and super/special Highrise buildings of marine engineering and earthquake/typhoon zone.Compare with steel construction, SRC structure can be saved great deal of steel, strengthens section rigidity, overcomes the shortcomings such as steel structure fire-resistant, erosion resistance and poor durability and easy flexing unstability, and the ability of steel is fully played; Compare with ordinary reinforced concrete structure (abbreviation reinforced concrete structure), steel reinforced concrete structure can reduce the sectional dimension of member, reduces shared space, thereby increases building usage space; In construction, the Steel Skeleton of steel reinforced concrete structure itself can be used as the skeleton that concrete is hung mould, sliding formwork, has not only greatly simplified formwork engineering, still bears whole construction loads supporting system of (comprising extension, sliding formwork and institute's pouring concrete); In addition, due to SRC structure, to have globality strong, and the advantages such as good working ductility can be improved the brittleness of Steel Concrete sheared destruction greatly, and the anti-seismic performance of structure is significantly improved, and supporting capacity and ductility are all greatly improved than reinforced concrete structure.Therefore, in Japan and the developed country such as American-European, the SRC structure with good anti-seismic performance has become a kind of generally acknowledged novel earthquake-proof structural system, and with steel construction, timber structure, skeleton construction and be called four macrostructures.China is also the country of earthquake more than, and most areas are seismic region, and part is positioned at high earthquake intensity and frequently occurred earthquake district, promotes SRC structure just have very important realistic meaning in these areas.Therefore, SRC structure has boundless application prospect in China, especially along with the successful development of the continuous enhancing of China's economic strength and super/special high-strength steel and super/special high-strength high-performance concrete (they be putative 21 century material) and apply, applying and progress of this structural system will greatly be promoted.There are some researches prove, the intensity of super/special high-strength high-performance concrete is higher, and its fragility will increase, ductility also can be poor, under heavily stressed or complex stress condition, super/special high-strength high-performance concrete member will be controlled destructive process by fragility, and the reliability of work reduces.But, this novel High Technique Concrete is applied in reinforced concrete composite structure (being called for short SRC structure), it is surpass/special high-strength high-performance concrete unitized construction of shaped steel (being called for short USUPSRC structure), can maximize favourable factors and minimize unfavourable ones, overcome the large and poor weakness of ductility of super/special high-strength high-performance concrete fragility, its high-performance and economic benefit are given full play to.
In SRC structure, between type Steel concrete, good cohesive action is the basis that guarantees the medium-sized Steel concrete co-ordination of SRC member, shaped steel, reinforcing bar and three kinds of material elements collaborative works of concrete, to resist various effects of action, can give full play to its advantage.But one of remarkable difference of SRC structure and reinforced concrete structure is the cohesive force between type Steel concrete and is far smaller than the cohesive force between reinforcing bar and concrete, the cohesive force of shaped steel and normal concrete is approximately only equivalent to 45% of plain bar cohesive force.Domestic and international many experimental studies show, exist bond-slip phenomenon between type Steel concrete, and the stress performance of SRC member and even supporting capacity are had to remarkably influenced.Therefore, how to guarantee type Steel concrete effectively collaborative work become one of emphasis of SRC structural research.At present, in engineering design, the treatment process of bond-slip problem between type Steel concrete is generally had to two kinds: the first is by calculating the shearing connecting piece that adds some amount in component surface, certainly will cause like this inconvenience in construction and improve cost, and easily causing the defects such as the congenital microfracture of inside concrete; It two is not arrange or only arrange a small amount of shearing connecting piece, considers the impact of bond-slip in supporting capacity is calculated, and the supporting capacity of corresponding reduction member, certainly exists uneconomic factor like this.On the other hand, in Structural Design, ubiquity is focused on intensity and the phenomenon of light weather resistance, has occurred the security in use of many concrete structures and the problem of weather resistance aspect both at home and abroad.Half is because alkali-aggregate reaction, Chloride Attack etc. are former thereby completely lose use function and even supporting capacity using not enough design period for some concrete structure engineerings, even there is partial collapse or total Collapse in indivedual engineerings, causes casualties or Architectural Equipment destruction.Therefore, in USUPSRC structure, improve the natural adhesive property between shaped steel and super/special high-strength high-performance concrete, on shaped steel surface, do not arrange or only by structure requirements arrange a small amount of shearing connecting piece just can guarantee shaped steel and surpass/special high-strength high-performance concrete effectively the research of collaborative work be significant; Meanwhile, the weather resistance of concrete structure engineering also causes people's close attention and great attention day by day, and becomes divination by means of the milfoil problem to be solved.
Prior art has the concrete technology of preparing of super high strength high performance of high-strength high-performance concrete and C110, C120, C130, C140 and the C150 of C60, C70, C80, C90 and C100 for the concrete strength grade of reinforced concrete composite structure, above-mentioned each strength grade concrete has significantly improved the adhesive property between shaped steel and (surpassing) high-strength concrete, and has improved the weather resistance of structure; But, also exist and can not extend to thus more high-intensity surpass/special high-strength high-performance concrete, and while using it for reinforced concrete composite structure, can not solve the poor problem of natural adhesive property between shaped steel and super/special high-strength high-performance concrete, therefore can not meet civil engineering work extends in aerial, underground and water, build super/extra-high-speed, super/Super-Long Span, undergroundization, sea or under water change, the requirement of these trend of application and development such as super durableization and heavy, huge and novel Structural Engineering.In addition, in prior art, also exist part by concrete super/technology of preparing of extra-high-speed strengthening, super/special durableization, but they all do not relate to or the unresolved shaped steel problem poor with natural adhesive property between surpass/special high-strength high-performance concrete during for SRC structure.
Summary of the invention
The object of this invention is to provide a kind of surpass/special high-strength high-performance concrete that is C200 for reinforced concrete composite structure strength grade.This concrete is applied in reinforced concrete composite structure, can descend the adhesive property between remarkable modified version Steel concrete state of nature (that is shaped steel surface does not arrange or only by structure requirement, a small amount of shearing connecting piece is set), effectively performance Steel concrete bi-material mechanical property separately and cooperative work performance mutually, thereby the significantly supporting capacity of lift structure member and use properties; In addition, this concrete can improve the weather resistance of structure, and has good serviceability, high volume stability and economy.
For solving the problems of the technologies described above, the present invention is achieved in that a kind of concrete for reinforced concrete composite structure C200 strength grade, it is characterized in that, this mix proportion is (unit: kg/m 3):
Cement: fine aggregate: coarse aggregate: water: Concrete superplastizer: defoamer: silicon ash: flyash: exciting agent: swelling agent=473: 846: 1054: 98.8: 19.6: 1.1: 84: 123: 7.2: 40;
Described cement is selected the 625R ordinary Portland cement of steady quality, better performances, before use, need to carry out compatibility test between the two with poly carboxylic acid series concrete superplasticizer, test method adopts the method in existing building material industry standard < < cement and water reducer compatibility test method > > JC/T 1083-2008, and selection and the good cement type of poly carboxylic acid series concrete superplasticizer consistency.Selected cement performance index (comprises fineness, SO 3content, MgO content, presetting period, final setting time, 3 days intensity, 28 days intensity) should be not less than the requirement of national existing relevant criterion, and select that alkali content is few, hydration heat is low, need also low cement type of water-based.
Described fine aggregate adopt that particle is round and smooth, quality is hard, grating is good in partially thick river sand and quality is consummate, grating is good quartz sand.Wherein, the quality of sand should be not less than the high-quality sand standard of stipulating in 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 14684-2001.Its fineness modulus is between 2.8~3.2, and silt content and clod content should be not more than 0.3%(in mass), chloride ion content should be not more than 0.05%(in the quality of dry sand).In quartz sand, dioxide-containing silica should be not less than 99%, and ferric oxide content should be not more than 0.005%, and the metals content impurities such as chromium, titanium should be not more than 0.01%.
Described coarse aggregate adopts that quality densification is hard, intensity is high, surface irregularity, particle shape are almost spherical, elongated particles is little, grating is good take the artificial rubble that grouan, basalt is main component, and the quality of rubble should be not less than the specified requirement of the relevant criterion such as existing building material industry standard < < regular concrete sand, stone quality and test method standard > > JC/T 52-2006.The cubic compressive strength of aggregate parent rock should be lower than 160MP.Maximum particle diameter should be controlled at 10mm,, silt content should be not more than 0.2%(in mass), clod content should be not more than 0.1%(in mass), pin, platy shaped particle content should be not more than 0.5%(in mass), and must not sneak into weathering particle.While carrying out this Concrete, adopt continuous size fraction rubble Φ 5~Φ 10 to feed intake.
Through a large amount of tentative simultaneous tests and with cement compatibility test, this invents selected high efficiency water reducing agent is poly carboxylic acid series concrete superplasticizer, its quality should be not less than the specified requirement of the relevant criterion such as existing national standard < < concrete admixture > > GB 8076-2008, and the water-reducing rate of selected high efficiency water reducing agent should be greater than 30%.The maximum saturation volume of selected high efficiency water reducing agent is not less than 2.5% of whole binder total amounts, adopts with mixing method, and needs to carry out compatibility test with selected cement type before using.
Described defoamer is selected AGITAN@P803 powder defoamer.
Described silica flour adopts 30nm nano silica fume and (Asia) SILICA FUME, its quality should be not less than the specified requirement of the relevant criterion such as national standard < < mineral admixture for high-strength high-performance concrete > > GB/T 18736-2002, simultaneously, the water ratio of 30nm nano silica fume and (Asia) SILICA FUME all should be not more than 1%, loss on ignition all should be not more than 3%, chloride ion content 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 be not less than 40000m 2/ kg, silicone content should be not less than 99.9%; The specific surface area of (Asia) micron silica flour should be not less than 25000m 2/ kg, dioxide-containing silica should be not less than 95%.
The special fine powdered coal of high-quality I level that described flyash adopts coal-fired technique advanced person's power plant to produce.Its quality should be not less than national standard < < for the specified requirement of the relevant criterion such as flyash > > GB/T 1596-2005 of cement and concrete, and (0.045mm square hole sieve tails over its fineness, %) should be not more than 10%, loss on ignition should be not more than 3%, SO 3content 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%, and specific surface area should be greater than 700m 2/ kg.
Described exciting agent is by contriver place research team independent development, is through to the research of super fine powder coal ash hydration reaction feature and recognize on the basis that its activity needs further to excite and utilize, by 55~60% Starso (Na 2siO 39H 2o), 38~43% white lime (Ca (OH) 2) and 1.5~2.5% manganous sulfate (MnSO 4h 2o) formulated a kind of chemical activator by mass percentage.This exciting agent has good consistency with early strong ordinary Portland cement, poly carboxylic acid series concrete superplasticizer.
Described swelling agent is selected calcium sulphoaluminate class concrete high-efficiency expanding agent, its quality should be not less than the specified requirement of the relevant criterion such as national standard < < cement expansive material > > GB 23439-2009, and (0.08mm square hole sieve tails over its fineness, %) should be not more than 10%, specific surface area should be greater than 300m 2/ kg, limited expansion rate (in water 7 days) should be not less than 0.05%, 28d ultimate compression strength and should be not less than 50MPa, and MgO content should be not more than 3%, and alkali content should be not more than 0.5%.
Described mixing water is selected tap water, its quality should be not less than the specified requirement of the relevant criterion such as nation-building ministerial standard < < the reinforcement of concrete water quality standard > > JGJ 63-2006, and requires the alkali content of selected tap water to be not more than 1000mg/L.
The present invention gives the concrete preparation method for reinforced concrete composite structure C200 strength grade, and the method adopts improved cement to wrap up in sandstone method concrete stirring technology, and concrete technology step is as follows:
1) first by Concrete superplastizer 19.6kg/m 3with exciting agent 7.2kg/m 3evenly admix load weighted water 98.8kg/m 3in, obtain mixture;
2) then according to weight proportion, in forced mixer, add 761.4kg/m 3river sand, 84.6kg/m 3quartz sand and step 1) amount of the mixture 1/3, uniform stirring 1~2min;
3) add again 1054kg/m 3Φ 5~Φ 10 continuous size fraction rubble coarse aggregates and step 1) amount of the mixture 1/3, uniform stirring 2~4min;
4) then add whole consolidating materials:, 473kg/m 3cement, 40kg/m 3swelling agent, 50.4kg/m 3nano silica fume, 33.6kg/m 3sub-micro silica flour and 123kg/m 3flyash, uniform stirring 3~4min;
5) finally add 1.1kg/m 3defoamer and remaining step 1) mixture, uniform stirring 2~3min, stops and after 3 minutes, stirs 2~3min to evenly again, discharging obtains the concrete mix of C200 strength grade.
The concrete mix that is C200 for reinforced concrete composite structure strength grade of described preparation, its maintenance process adopts the vapor cure in heating curing, its maintenance flow process is: quiet stopping (4~6 hours) → (relative humidity is greater than 95% to → thermostatically heating in intensification heating (heat-up rate is 10 ℃ per hour), 80 ℃~90 ℃, 48~72 hours) → cooling heating (cooling rate is 10 ℃ per hour) → normal curing to 28 day.
The invention has the beneficial effects as follows:
1. the concrete that the present invention produces is a kind of surpass/special high-strength high-performance concrete that reinforced concrete composite structure strength grade is C200 that is applicable to.This concrete can guarantee that its mechanical property that should possess (is C200 strength grade, plasticity etc.) and there is high-durability, high workability, on the basis of high volume stability and economy, improve significantly the natural adhesive property between this concrete and shaped steel, it is applied in steel reinforced concrete structure design and without (or only needing by a little ground of structure requirement), on shaped steel surface, adds shearing connecting piece, can guarantee shaped steel and this concrete effective collaborative work, thereby reduced working procedure, steel have been saved, improved operating efficiency, and avoided arranging in a large number on shaped steel surface shearing connecting piece and easily caused the defects such as the congenital microfracture of this inside concrete, there is significant economic benefit and construction quality improvement effect, its mechanical property comparative test result is in Table 2.
2. the high efficiency water reducing agent using in the present invention is selected poly carboxylic acid series concrete superplasticizer (water-reducing rate should be greater than 30%), compares the water reducer of other type, good with the consistency of early strong ordinary Portland cement, and it is not containing Na 2sO 4, can further improve this concrete weather resistance.
3. the defoamer using in the present invention is selected powder defoamer, model is AGITAN@P803, can carry out deaeration to a large amount of microvesicles that still remain in concrete after formation and vibration compacting in concrete-agitating process, its degree of compactness is effectively improved, strengthened concrete weather resistance and shear stability.
4. the exciting agent using in the present invention is selected the alkali-activator (XJFAA) of independent development, can make the concrete that is mixed with flyash have certain micro-expansibility, improves concrete shrinkage; Can strengthen and in water of coal ash and process, take the Vitrea corrosive nature of three-D space structure that aluminosilicate is main aquation component, excite the lateral reactivity of flyash, improve the power of forward hydration reaction, generate the crystal such as more C-S-H gel, drated calcium aluminate and hydrated calcium silicate, intensity and the corrosion resistance of institute's concrete batching are increased significantly.
5. the nano silica fume using in the present invention is a kind of nontoxic, tasteless, pollution-free, high purity, pure nano material.The particle size of nano silica fume is little, and specific surface area is large, can give full play to its micro-packing effect; There is the hydrogen base of a large amount of unsaturated residual bonds and different bond styles in nano silica fume surface, or for depart from the silica structure of steady state because of anoxic, can consume and refinement Ca (OH) 2crystal, promotes hydration rate and extent of hydration, makes the hydrated calcium silicate gel of formation finer and close; Than (Asia) SILICA FUME, there is higher activity (particularly induced activity) and free energy state, the raising of the improvement of concrete microstructure and mechanical property (being C200 strength grade, plasticity etc.) is all had to no small promoter action.
6. the swelling agent using in the present invention is a kind of calcium sulphoaluminate class concrete high-efficiency expanding agent.Calcium sulphoaluminate class concrete high-efficiency expanding agent and hydrate generate ettringite swelling water compound crystal (C 8a3CaSO 432H 2o), can prevent or reduce the caused volumetric shrinkage cracking of chemical reaction, physical reaction and thermodynamical reaction in concrete hydrating, sclerosis compensates, and can fill, stop up various pores seam and make concrete inner structure finer and close, not only greatly improved concrete anti-crack and anti-seepage performance and volume stability, and can make concrete density and intensity be further improved.
7. the quartz sand using in the present invention is a kind of silicate minerals of hard, wear-resisting, stable chemical performance.Its essential mineral composition is silicon-dioxide, has certain resistance to acid erosion medium resistance ability, and can make up the shortcoming participation hydration reaction that river sand is inert material, has improved concrete weather resistance and intensity.
8. the present invention produces, and for reinforced concrete composite structure strength grade, to be C200 super/and special high-strength high-performance concrete is under normal concrete manufacturing condition, and adopt and to reduce cement that cement granules, admixture particle and superfine active mineral grain fly upward when concrete-agitating as far as possible everywhere and wrap up in that the feeding method of sandstone stirring technique realizes, preparation technology is simple and be easy to realize, be suitable for through engineering approaches and industrialization, be convenient to large-scale promotion application, there is good social benefit.
9. the starting material of the surpass/special high-strength high-performance concrete that is C200 for reinforced concrete composite structure strength grade that the present invention produces contain a large amount of flyash, silica flour; they are industrial waste and waste; it is dissolved and can make huge contribution to environment protection; meet the requirement of Sustainable development; a kind of green concrete, a kind of environment-friendly material.
10. the market circulation that the starting material (comprising industrial waste) that the present invention selects are a large amount of, large-scale production, buy and sell product, starting material are easy to get.
The steam heating maintenance adopting in 11. the present invention can be accelerated the performance of process and the volcanic ash effect of cement and active mineral admixture hydration reaction, can improve concrete microstructure, has improved its interfacial adhesion and intensity.In addition, the steam heating maintenance technology of concrete or concrete member is already ripe, and easily grasps, for applying of this invention laid a good foundation.
12. the present invention produce, and for reinforced concrete composite structure strength grade, to be C200 super/and special high-strength high-performance concrete is by adding superfine active mineral disastrously to expect (superfined flyash and Ultrafine Grinding silica flour), utilize the pozzolanic reaction of active mineral admixture, reinforcing effect, filling effect, weather resistance is improved the warm peak subtractive effect of effect and super/special high-strength high-performance concrete hydration heat, and make full use of that active mineral admixture is compound to be mixed and super synergistic effect that the composite blend of active mineral admixture and high efficiency water reducing agent produces, according to them and cement granules, coarse-fine aggregate particle diameter is the grain composition of gelling material part in the surpass/strong high-performance concrete material of extra-high-speed of feature optimization of same one-level not, not only make to surpass/gather materials in special high-strength high-performance concrete and Behavior of Hardened Cement Paste between interface structure and the pore structure of Behavior of Hardened Cement Paste all obtained significantly improving, improved the density of Behavior of Hardened Cement Paste, impervious, simultaneously typical dense structure can expand to aggregate surface, thereby make to surpass/special high-strength high-performance concrete is more closely knit hard, the mechanical property (adhesive property especially and between shaped steel) of super/special high-strength high-performance concrete, endurance quality and serviceability all improve a lot.
Embodiment
The present invention is with the adhesive property between the lower remarkable modified version Steel concrete of state of nature (that is shaped steel surface does not arrange or only by structure requirement, a small amount of shearing connecting piece is set), effectively bring into play Steel concrete bi-material mechanics and cooperative work performance separately, thereby the significantly supporting capacity of lift structure member and performance, and the weather resistance that improves structure is aim, the technology of preparing of to study for reinforced concrete composite structure strength grade be C200 super/special high-strength high-performance concrete.At present, quality and the intensity of making super/special high-strength high-performance concrete ordinary Portland cement used are both at home and abroad more and more higher, processing technology and the quality of active mineral admixture used (silica flour, flyash etc.) are updated, in addition the research of the concrete admixture such as superplasticizer, high-efficiency expanding agent has all obtained larger progress with application, and the research in concrete of defoamer and exciting agent and application also just progressively development, thereby identified basis for the realization of above-mentioned study tenet.Meanwhile, the cement consumption of the requirement of super/special high-strength high-performance concrete is relatively less, means a large amount of discharges of carbonic acid gas, therefore alleviated to a certain extent the Greenhouse effect that the earth is caused and produce cement; Its requires there is sufficient amount and accounts for the active mineral spike of the high-qualitys such as flyash that consolidating material proportion is larger, silica flour; mean the reasonable disposal utilization of industrial waste; by being conducive to, form good production cycle and environment protection, and that the active mineral spike of these high-qualitys improves concrete material self performance is just needed.In a word, application is super/special high-strength high-performance concrete can save cement, by industrial waste turn waste into wealth, extending structure engineering working life, and finally preserve the ecological environment and natural resources.In sum, for reinforced concrete composite structure super/research and development of special high-strength high-performance concrete are for to be used concrete to walk out the road of a Sustainable development better, it is by the integration capability of lift structure engineering and performance, promote steel-concrete combined structure in China, the high level in especially high earthquake intensity and frequently occurred earthquake area, super/special Highrise buildings, offshore platform or underwater structure, hypogee, super/Super-Long Span, in super/extra-heavy duty type structure, apply, improve the scientific and technological content of building structure in Infrastructure and human settlement, and bring into play it and there is larger supporting capacity and rigidity, good anti-seismic performance, construction speed is fast, the unique advantages such as good and the significant social and economic benefit of durable and resistivity against fire.Therefore, surpass/special high-strength high-performance concrete unitized construction of shaped steel has very high engineering using value and wide market outlook.
Surpass/special the high-strength high-performance concrete that is C200 for reinforced concrete composite structure strength grade of the present invention's development, except adopting similar material-cement, sand, rubble, water with normal concrete, also added its indispensable component: Concrete superplastizer, concrete high-efficiency expanding agent and active mineral admixture (silica flour, flyash), also mixed powder defoamer and exciting agent in addition.Super/special high-strength high-performance concrete is different from normal concrete, and its intensity and performance all more common and high-strength concrete are greatly improved.The water cement ratio of super/special high-strength high-performance concrete is generally all less than 0.24, and the water cement ratio of common and high-strength concrete is generally more than 0.30, and the maximum size of coarse aggregate of super/special high-strength high-performance concrete is also less than common and high-strength concrete.Above-mentioned every difference has caused, and super/special high-strength high-performance concrete has very large difference with common with high-strength concrete in performance, by adding superfine active mineral, disastrously expect, utilize the pozzolanic reaction of superfine active mineral spike, (micro-) filling effect and plasticization effect, optimize the grain composition of gelling material part in super/strong high-performance concrete material of extra-high-speed, not only make to surpass/gather materials in special high-strength high-performance concrete and Behavior of Hardened Cement Paste between interface structure and the pore structure of Behavior of Hardened Cement Paste all obtained significantly improving, improved the density of Behavior of Hardened Cement Paste, impervious, simultaneously typical dense structure can expand to aggregate surface, thereby make to surpass/special high-strength high-performance concrete is more closely knit hard, mechanical property (adhesive property especially and between shaped steel) and the endurance quality of super/special high-strength high-performance concrete all improve a lot.Simultaneously, by mixing of powder defoamer, can reduce in concrete-agitating process form and vibration compacting after still remain in the transition zone, interface in cement slurry or between cement slurry and aggregate in concrete a large amount of bubbles carry out deaeration, its degree of compactness is effectively improved, to the mechanical property of super/special high-strength high-performance concrete (comprise and shaped steel between adhesive property) and the raising of endurance quality all made no small contribution.In addition, by the admixture of exciting agent, can make concrete there is certain micro-expansibility, improve concrete shrinkage; Can strengthen and in water of coal ash and process, take the Vitrea corrosive nature that aluminosilicate is main aquation component, increase the activity of flyash, improve the power of forward hydration reaction, generate the crystal such as more C-S-H gel, drated calcium aluminate and hydrated calcium silicate, intensity and the corrosion resistance of institute's concrete batching are increased significantly.And the admixture of concrete high-efficiency expanding agent, the volumetric shrinkage cracking that can produce concrete hardening reaction compensates, the various pore seams in concrete be can fill, stop up, concrete anti-crack and anti-seepage performance, density, intensity and volume stability improved.
With the Binder Phase between plain bar and concrete seemingly, the cohesive force between type Steel concrete is also mainly comprised of chemical bond power, friction resistance and mechanical snap power three parts.Each integral part of cohesive force between type Steel concrete is all closely related with concrete performance.
Chemical bond power is chemical clinging power or the adsorptive power that the cement gel body in concrete produces on shaped steel surface, and its (shearing resistance) ultimate value depends on the character of cement and the degree of roughness on shaped steel surface.During casting concrete, cement slurry produces surface tension at steel surface, and under capillary effect, the cement slurry on steel surface will form self-equilibrating; Deposit concrete generally will vibrate, and cement slurry can be strengthened and accelerate to the power of vibrating (disturbance) to the infiltration of steel surface zone of oxidation; Cement slurry crystallization in maintenance processes, cement crystal forms chemical bond power.Chemical bond power only exists under the original formation state of Steel Reinforced Concrete Members, once there is (part) bond-slip on joint face, cement crystal will be cut off and attrition crushing, and chemical bond power is lost.The principal element that affects chemical bond power has concrete strength, shaped steel steel surface degree of roughness, test specimen to build mode and the maintenance in vibrate degree and later stage and concrete contraction situation etc.
After chemical bond power is lost, coarse injustice and the caused steel surface changed condition of other reason (steel surface is uneven) due to steel surface, concrete crystal grain on itself and contact surface is interlocked, has so just formed mechanical snap power.For the shaped steel such as rolled steel joist of processing plant produced postmenstruation, once bond-slip development accelerate, the crushed integration of concrete crystal on shaped steel and concrete surface, at this moment also substantial loss of mechanical snap power.The principal element that affects mechanical snap power is the degree of roughness of shaped steel steel surface and the force way of surface appearance (corrosion degree etc.), aggregate grating, concrete strength and Steel Reinforced Concrete Members etc.
Shaped steel surrounding concrete is also to form after the bond failure between type Steel concrete to the friction resistance of shaped steel, and is mainly just to play a role after mechanical snap power is lost substantially.When chemical bond power; especially after mechanical snap power is lost; due to shaped steel contact surface on concrete crystal cut off, crushed and expanded; in addition the lateral confinement such as protective layer and stirrup; to on shaped steel and concrete joint face, produce positive pressure; add that on joint face, frictional coefficient is larger, thereby formed friction resistance.Friction resistance all exists after chemical bond power is lost always, is the major portion of later stage cohesive force between type Steel concrete.Affect friction resistance because have size, member stress mode, the aggregate grating of joining adhesive surface between steel form and surface characteristic thereof, type Steel concrete of shaped steel and affecting factor (thickness of concrete cover of shaped steel, stirrup ratio, concrete shrinkage) of lateral confinement etc.
Key technical problem to be solved by this invention is, guaranteeing to surpass/mechanical property (being intensity and plasticity) that special high-strength high-performance concrete should possess and there is high-durability, high workability, on the basis of high volume stability and economy, improve significantly (nature) adhesive property between concrete and shaped steel, make without (or only needing by a little ground of structure requirement), on shaped steel surface, to add shearing connecting piece in steel reinforced concrete structure design, can between assurance type Steel concrete, there be reliable bonding and anchoring, make both energy under loading action harmonious, common work.
The present invention from theory and design in principle, break the restriction of " full sieve rice " formula, by orthogonal experiment and contrast experiment's method, consider Concrete superplastizer, concrete high-efficiency expanding agent, defoamer, between exciting agent and with the consistency of cement, maximum size of coarse aggregate, between coarse aggregate different-grain diameter and and fine aggregate particle diameter between level pairing concrete strength and the impact of performance and (micro-) filling effect of active mineral spike, the performance factors such as pozzolanic activity, select high-quality coarse-fine aggregate and control particle diameter and grating, in super/special high-strength high-performance concrete its preparing materials, mix appropriate Concrete superplastizer, concrete high-efficiency expanding agent and high-quality active mineral ultrafine powder, and consider adding of defoamer and exciting agent, reduce water cement ratio, be based on the local existing material that is easy to get, do not change conventional production process, for reduce cement granules as far as possible, admixture particle and superfine active mineral grain fly upward everywhere and adopt cement to wrap up in the feeding method of sandstone stirring technique when concrete-agitating, utilize the pozzolanic reaction of active mineral admixture, reinforcing effect, (micro-) filling effect, weather resistance is improved the warm peak subtractive effect of effect and super/special high-strength high-performance concrete hydration heat, and make full use of that active mineral admixture is compound to be mixed and super synergistic effect that the composite blend of active mineral admixture and Concrete superplastizer produces and the deaeration effect of defoamer, the compensate for shrinkage of swelling agent and filling effect, the activity excitation effect of exciting agent, make mechanical property (adhesive property especially and between shaped steel) good, serviceability is excellent, excellent in durability, surpass/special the high-strength high-performance concrete that the strength grade that is applicable to reliability application in steel reinforced concrete structure that cost is relatively low is C200.Mechanical property test comparing result of the present invention is as shown in table 2.
When the present invention selects starting material, not only requiring starting material is high-quality, also require to prepare to surpass/special high-strength high-performance concrete starting material used are that locality is easy to get.In addition, consider that the intensity of institute's concrete batching is very high, according to maximum density theory, the grain composition of coarse-fine aggregate in concrete material is optimized, make large or fine granule have mutually good filling, to reduce the voidage of aggregate, simultaneously, the median size of general cement is 20~30 μ m, the particle that is less than 10 μ m is also few, and the grain diameter of active mineral admixture is tiny more than cement granules particle diameter, the median size of superfined flyash is 3~6 μ m, space between energy filling concrete particle, the median size of SILICA FUME is also very little, be 0.10~0.26 μ m, between energy filling concrete particle and superfined flyash particle and the space between superfined flyash particle, the median size of nanometer SILICA FUME is less, for 10nm~0.1 μ m, can fill between gelling particle and and interface structure between fine gap or space, so be optimized also most important to the grain composition of gelling material part in the prepared surpass/strong high-performance concrete material of extra-high-speed.And the outside deteriorated factor (as factors such as vitriol) depends on concrete pore structure to a great extent to concrete aggressiveness, and this causes the major cause of Durability of Concrete just.Mixing of active mineral admixture, reduced between cement granules and the voidage at interface, make water mudrock structure and interface structure more fine and close, blocked the infiltration path that may form, thereby the impermeability of prepared surpass/special high-strength high-performance concrete is increased substantially, water and other various etching medium (CL -, SO4 2-, CO2 etc.) be all difficult to enter inside concrete, and can reduce the occurrence probability of alkali-pasc reaction and the generation probability of Losantin, its intensity and endurance quality are greatly improved.In water mudrock structure and interface structure, be greater than the macropore content of 0.1 μ m when lower, by being conducive to, prepare the improvement of the properties of super/special high-strength high-performance concrete, otherwise, all unfavorable to intensity, anti-permeability performance, corrosion resistance and the endurance quality of the super/special high-strength high-performance concrete of prepare.
With active mineral admixture, replace after part of cement, the mineral admixture that can also make the portion of water in cement granules space be filled in it cements out, and can make the degree of mobilization of cement paste increase.But also not all mineral admixture all has this significant plasticization effect, mainly because the specific surface area of part active mineral admixture is too large or itself have vesicular structure, although it can displace the part moisture in cement paste after replacing cement, but due to itself water suction or wetted surface need more free water, cause the mobility of cement paste not increase.In order to guarantee, develop the high workload performance of super/special high-strength high-performance concrete, the present invention adopts Concrete superplastizer and the compound method of mixing of active mineral admixture, under both collaborative works, the subparticle of active mineral spike has not only been given full play to their (micro-) filling effect, and the moisture being filled among space is cemented out, make between particle between water-resisting layer thickening; In addition, the subparticle of active mineral admixture has adsorbed Concrete superplastizer molecule, the electrostatic repulsion that the electrostatic double layer current potential that its surface forms produces is greater than the universal gravitation between powder particle, impel powder granule to disperse, and further aggravate the dispersion of cement granules, the mobility of cement paste is increased, thereby effectively improved the mobility of compound; Meanwhile, compound the mixing of super fine active mineral admixture reduced hydration heat, can improve concrete volume stability.
For preparing the aggregate of the starting material of super/special high-strength high-performance concrete, should there is higher inherent strength, toughness and stability, can resist various Static and dynamic stress, impact and abrasive action, and can not cause the decline of institute's concrete batching performance.Because the condition of surface of different aggregates is different, cause cement slurry also not identical with the cohesive strength between aggregate, generally rubble has higher cohesive strength compared with cobble; On the other hand, in cement slurry, the asynchronous cohesive strength of silicon ash content ratio differs also very large, and during mixing silica, the cohesive strength between cement slurry and aggregate is much higher when not mixing.Normal concrete is when destroying, the bonding interface of cement slurry and aggregate is weak link, crack is to occur along the interface of cement slurry and aggregate, aggregate generally can not destroy, and the extraneous from then on interface of often corroding also starts development, and cement slurry in super/special high-strength high-performance concrete and the bonding interface of aggregate are no longer weak links, its destruction also no longer occurs along interface, but because the destruction of aggregate causes, so the performance of aggregate has larger impact to the performance of super/special high-strength high-performance concrete.The fine aggregate selected in research of the present invention adopt that particle is round and smooth, quality is hard, grating is good, silt content is little in thick river sand; Coarse aggregate is surface irregularity, fine quality, grating is good take the artificial rubble that grouan, basalt is main component, and its maximum particle diameter should be controlled at 10mm.Like this, the further lifting of having got back of concrete homogeneity, thus make concrete more closely knit, intensity also can be further enhanced.
The present invention adopts cement to wrap up in sandstone method (claiming again improved SEC method) concrete stirring technology in the preparation, in forced mixer, stir, its feeding sequence is: first poly carboxylic acid series concrete superplasticizer and exciting agent are evenly admixed in load weighted water, obtained mixture, then add fine aggregate and be mixed with 1/3 of superplasticizer and exciting agent amount of the mixture → stir (1~2 minute) → add coarse aggregate and be mixed with the whole consolidating material (cement in 1/3 of superplasticizer and exciting agent amount of the mixture → stir (2~4 minutes) → add, swelling agent, silicon ash and flyash) → stir (3~4 minutes) → add defoamer and residue be mixed with superplasticizer and exciting agent mixture → uniform stirring (2~3 minutes) → stop and after 3 minutes, be stirred to evenly (2~3 minutes) → discharging again.This technique can reduce cement granules as far as possible and superfine active mineral grain flies upward everywhere when concrete-agitating, and can improve prepared concrete intensity, and segregation phenomenon should not appear in prepared concrete, and bleeding is few, and serviceability is relatively better.
The present invention adopts the vapor cure in heating curing when maintenance, its maintenance flow process is: quiet stopping (4~6 hours) → (relative humidity is greater than 95% to → thermostatically heating in intensification heating (heat-up rate is 10 ℃ per hour), 80 ℃~90 ℃, 48~72 hours) → cooling heating (cooling rate is 10 ℃ per hour) → normal curing to 28 day.This maintenance process can be accelerated the performance of process and the volcanic ash effect of cement and active mineral admixture hydration reaction, can improve concrete microstructure, has improved its interfacial adhesion and intensity.
Embodiment:
(1) starting material
1. cement
Select the Qinling Mountains board PO 62.5R cement of steady quality, better performances, before using, carry out compatibility test between the two with poly carboxylic acid series concrete superplasticizer, test method adopts the method in existing building material industry standard < < cement and water reducer compatibility test method > > JC/T 1083-2008, good with poly carboxylic acid series concrete superplasticizer consistency.Selected cement performance index meets the requirement of national existing relevant criterion, and its alkali content is few, hydration heat is low, need water-based also low.
2. aggregate
Partially thick, Ba river sand during sand employing particle is round and smooth, quality is hard, grating is good, the quality of sand meets the high-quality sand standard of stipulating in existing building material industry standard < < regular concrete sand, stone quality and test method standard > > JC/T 52-2006 and national standard < < building sand > > GB/T14684-2001.Its fineness modulus is 3.0, and silt content and clod content are all controlled at 0.3%(in mass) below, chloride ion content is controlled at 0.05%(in the quality of dry sand) below.
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 be not more than 0.005%, and the metals content impurities such as chromium, titanium should be not more than 0.01%.While carrying out this Concrete, adopt and feed intake different-grain diameter specification (2-4mm, 1-2mm, 0.63-1mm, 0.315-0.63mm, 0.16-0.315mm, <0.16mm) multistage joining.
Coarse aggregate adopts quality densification hard, and intensity is high, surface irregularity, and particle shape is almost spherical, pin, sheet content are little, the artificial rubble that grating is good, its main component grouan and basalt content (in mass) are not less than 90%.The quality of rubble meets the specified requirement of the relevant criterion such as existing building material industry standard < < regular concrete sand, stone quality and test method standard > > JC/T 52-2006.The cubic compressive strength of aggregate parent rock is 180~250MPa.Maximum particle diameter is controlled at 10mm, and silt content is controlled at 0.2%(in mass) below, clod content is controlled at 0.1%(in mass) below, pin, platy shaped particle content are controlled at 0.5%(in mass) below, and must not sneak into weathering particle.While carrying out this Concrete, adopt continuous size fraction rubble Φ 5~Φ 10 to feed intake.
3. flyash
Adopt the special fine powdered coal of high-quality I level of power plant's production of coal-fired technique advanced person.Its quality meets national standard < < for the specified requirement of the relevant criterion such as flyash > > GB/T 1596-2005 of cement and concrete, (0.045mm square hole sieve tails over its fineness, %) be not more than 5%, loss on ignition is 2.2%, SO 3content is 1.5%, and water demand ratio is less than 95%, and specific surface area is about 1000m 2/ kg.
4. silica flour
The quality of the 30nm nano silica fume of selecting and (Asia) SILICA FUME meets the specified requirement of the relevant criterion such as national standard < < mineral admixture for high-strength high-performance concrete > > GB/T 18736-2002, the water ratio of 30nm nano silica fume and (Asia) SILICA FUME is all less than 1%, loss on ignition is all not more than 3%, chloride ion content is all not more than 0.01%, and pozzolanic activity index is all greater than 95%.Wherein, the specific surface area of 30nm nano silica fume is about 42000m 2/ kg, silicone content is not less than 99.9%; The specific surface area of (Asia) micron silica flour is about 27000m 2/ kg, dioxide-containing silica is not less than 99%.
5. Concrete superplastizer
Through a large amount of tentative simultaneous tests and with cement compatibility test, this invents selected high efficiency water reducing agent is poly carboxylic acid series concrete superplasticizer, its quality meets the specified requirement of the relevant criterion such as existing national standard < < concrete admixture > > GB 8076-2008, and the water-reducing rate of selected high efficiency water reducing agent is greater than 30%.The maximum doping quantity of selected high efficiency water reducing agent is 2.5% of whole binder total amounts, adopts with mixing method, and use is front and selected cement type carries out compatibility test and consistency is good.
6. exciting agent
Select by contriver place research team according to super fine powder coal ash hydration reaction feature and further excite and utilize the flyash lateral reactivity exciting agent (XJFAA) of its active independent development, being about to 55~60% Starso (Na 2siO 39H 2o), 38~43% white lime (Ca (OH) 2) and 1.5~2.5% manganous sulfate (Na 2siO 39H 2o) formulated a kind of chemical activator by mass percentage, refers to table 1.This exciting agent has good consistency with early strong ordinary Portland cement, poly carboxylic acid series concrete superplasticizer.
The different proportionings of table 1 XJFAA exciting agent
7. swelling agent
Through a large amount of tentative simultaneous tests and with cement compatibility test, this invents selected swelling agent is calcium sulphoaluminate class concrete high-efficiency expanding agent, its quality meets the specified requirement of the relevant criterion such as national standard < < cement expansive material > > GB 23439-2009, and (0.08mm square hole sieve tails over its fineness, %) be not more than 10%, specific surface area is about 400m 2/ kg, limited expansion rate (in water 7 days) is not less than 0.05%, 28d ultimate compression strength and is greater than 55MPa, and MgO content is not more than 2%, and alkali content is not more than 0.3%.
8. mixing water
Selecting tap water is mixing water, its quality meets the specified requirement of the relevant criterion such as the ministerial standard < < of Minstry of Housing and Urban-Rural Development of People Republic of China (MOHURD) concrete mixing water supply standard > > JGJ 63-2006, and alkali content is less than 800mg/L.
(2) proportioning
The proportioning that the super high strength high performance concrete that the present invention is C200 for the strength grade that will apply in steel reinforced concrete structure provides is as shown in table 2.
Table 2 is for the super high strength high performance concrete mix (unit: kg/m of reinforced concrete composite structure 3)
(3) stirring technique
This invention adopts cement to wrap up in sandstone method concrete stirring technology, and concrete technology step is as follows:
First by poly carboxylic acid series concrete superplasticizer 19.6kg/m 3with exciting agent 7.2kg/m 3evenly admix load weighted water 98.8kg/m 3in, obtain mixture; Then according to weight proportion, in forced mixer, add 761.4kg/m 3river sand, 84.6kg/m 3quartz sand and be mixed with superplasticizer and exciting agent amount of the mixture 1/3, uniform stirring, after 1~2 minute, adds 1054kg/m 3coarse aggregate (Φ 5~Φ 10 continuous size fraction rubbles) and be mixed with 1/3 of superplasticizer and exciting agent amount of the mixture, uniform stirring is after 2~4 minutes, then adds whole consolidating materials (comprising swelling agent): 473kg/m 3cement, 40kg/m 3swelling agent, 50.4kg/m 3nano silica fume, 33.6kg/m 3(Asia) SILICA FUME and 123kg/m 3flyash, uniform stirring, after 3~4 minutes, adds 1.1kg/m 3aGITAN@P803 powder defoamer and residue be mixed with the mixture of superplasticizer and exciting agent, uniform stirring 2~3 minutes, stirs 2~3 minutes again to evenly after having a rest 3 minutes, discharging obtains the concrete mix of C200 strength grade.
This technique can reduce cement granules, admixture particle and superfine active mineral grain as far as possible and fly upward everywhere when concrete-agitating, and can improve prepared concrete intensity, and segregation phenomenon should not appear in prepared concrete, and bleeding is few, serviceability is relatively better.
(4) maintenance process
This invention adopts the vapor cure in heating curing, and concrete maintenance flow process is as follows:
Quiet stopping (4~6 hours) → intensification heating (heat-up rate is 10 ℃ per hour) → thermostatically heating (relative humidity is greater than 95%, 80 ℃~90 ℃, 48~72 hours) → cooling heating (cooling rate is 10 ℃ per hour) → normal curing to 28 day.
This maintenance process can be accelerated the performance of process and the volcanic ash effect of cement and active mineral admixture hydration reaction, can improve prepared concrete microtexture, improves its interfacial adhesion and intensity.
(5) mechanical property test result contrast
The super high strength high performance concrete that the strength grade that is applicable to reinforced concrete composite structure of preparing according to above-mentioned proportioning is C200 is as shown in table 3 with the mechanical property comparative test result of general super high strength concrete (concrete that strength grade is C200).
Table 3 mechanical performance of concrete comparative test result
As can be seen from Table 3, the strength grade of preparing by this technology is the surpass/special high-strength high-performance concrete of C200, realized and can guarantee that its mechanical property that should possess (is C200 strength grade, plasticity etc.) and there is high-durability, high reliability, high workability, on the basis of high volume stability and economy, improve significantly (nature) adhesive property between concrete and shaped steel, make without (or only needing by a little ground of structure requirement), on shaped steel surface, to add shearing connecting piece in steel reinforced concrete structure design, can guarantee shaped steel and concrete effective collaborative work, thereby reduced working procedure, steel have been saved, improved operating efficiency, and avoided shearing connecting piece being set in a large number on shaped steel surface and easily causing the defects such as the congenital microfracture of inside concrete, can bring significant economic benefit and construction quality improvement effect, there are higher engineering using value and wide market outlook.

Claims (10)

1. for a concrete for reinforced concrete composite structure C200 strength grade, it is characterized in that, this concrete is according to kg/m 3proportioning be:
Cement: fine aggregate: coarse aggregate: water: Concrete superplastizer: defoamer: silica flour: flyash: exciting agent: swelling agent=473: 846: 1054: 98.8: 19.6: 1.1: 84: 123: 7.2: 40.
2. a kind of concrete for reinforced concrete composite structure C200 strength grade according to claim 1, it is characterized in that, described fine aggregate adopt that the ratio particle that mass ratio is 9:1 is round and smooth, quality is hard, grating is good in partially thick river sand and quality is consummate, grating is good quartz sand; Its fineness modulus is between 2.8~3.2; By quality ratio, its silt content and clod content should be not more than 0.3%; In the mass ratio of dry sand, its chloride ion content should be not more than 0.05%; In quartz sand, dioxide-containing silica should be not less than 99%, and ferric oxide content should be not more than 0.005%, and chromium, titanium metal foreign matter content should be not more than 0.01%.
3. a kind of concrete for reinforced concrete composite structure C200 strength grade according to claim 1, it is characterized in that, described coarse aggregate adopts that quality densification is hard, intensity is high, surface irregularity, particle shape are almost spherical, elongated particles is little, grating is good take the artificial rubble that grouan, basalt is main component, according to continuous size fraction rubble Φ 5~Φ 10, feeds intake; The cubic compressive strength of its parent rock of coarse aggregate should be not less than 160MP, and maximum particle diameter should be controlled at 10mm; By quality ratio, its silt content should be not more than 0.2%, and clod content should be not more than 0.1%, and pin, platy shaped particle content should be not more than 0.5%, and must not sneak into weathering particle.
4. a kind of concrete for reinforced concrete composite structure C200 strength grade according to claim 1, it is characterized in that, described Concrete superplastizer is selected poly carboxylic acid series concrete superplasticizer, water-reducing rate should be greater than 30%, and maximum saturation volume should be not less than 2.5% of whole binder total amounts.
5. a kind of concrete for reinforced concrete composite structure C200 strength grade according to claim 1, is characterized in that, described defoamer is selected AGITAN@P803 powder defoamer.
6. the concrete that is C200 for reinforced concrete composite structure strength grade according to claim 1, it is characterized in that, described silica flour adopts 30nm nano silica fume and the sub-micro silica flour that mass ratio is 3:2, the water ratio of 30nm nano silica fume and sub-micro silica flour all should be not more than 1%, loss on ignition all should be not more than 3%, chloride ion content 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 be not less than 40000m 2/ kg, silicone content should be not less than 99.9%; The specific surface area of submicron silica flour should be not less than 25000m 2/ kg, dioxide-containing silica should be not less than 95%.
7. the concrete that is C200 for reinforced concrete composite structure strength grade according to claim 1, it is characterized in that, described flyash adopts the special fine powdered coal of high-quality I level, and 0.045mm square hole sieve tails over and should be not more than 10%, its loss on ignition should be not more than 3%, SO 3content 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%, and specific surface area should be greater than 700m 2/ kg.
8. the concrete that is C200 for reinforced concrete composite structure strength grade according to claim 1, is characterized in that, described exciting agent is selected self-control flyash excitant XJFAJ, by the raw material of following mass percent, is prepared from:
Starso 55~60%, white lime 38~43%, manganous sulfate 1.5~2.5%.
9. the concrete that is C200 for reinforced concrete composite structure strength grade according to claim 1, it is characterized in that, described swelling agent is selected calcium sulphoaluminate class concrete high-efficiency expanding agent, and 0.08mm square hole sieve tails over and should be not more than 10%, and its specific surface area should be greater than 300m 2/ kg, in water, 7 days limited expansion rates should be not less than 0.05%, 28d ultimate compression strength and should be not less than 50MPa, and MgO content should be not more than 3%, and alkali content should be not more than 0.5%.
10. for the concrete preparation method of reinforced concrete composite structure C200 strength grade, it is characterized in that, the method adopts improved cement to wrap up in sandstone method concrete stirring technology, and concrete technology step is as follows:
1) first by Concrete superplastizer 19.6kg/m 3with exciting agent 7.2kg/m 3evenly admix load weighted water 98.8kg/m 3in, obtain mixture;
2) then according to weight proportion, in forced mixer, add 761.4kg/m 3river sand, 84.6kg/m 3quartz sand and step 1) amount of the mixture 1/3, uniform stirring 1~2min;
3) add again 1054kg/m 3Φ 5~Φ 10 continuous size fraction rubble coarse aggregates and step 1) amount of the mixture 1/3, uniform stirring 2~4min;
4) then add whole consolidating materials:, 473kg/m 3cement, 40kg/m 3swelling agent, 50.4kg/m 3nano silica fume, 33.6kg/m 3sub-micro silica flour and 123kg/m 3flyash, uniform stirring 3~4min;
5) finally add 1.1kg/m 3defoamer and remaining step 1) mixture, uniform stirring 2~3min, stops and after 3 minutes, stirs 2~3min to evenly again, discharging obtains the concrete mix of C200 strength grade.
CN201310493466.5A 2013-10-18 2013-10-18 C200 strength-grade concrete for formed steel concrete composite structure Expired - Fee Related CN103553460B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310493466.5A CN103553460B (en) 2013-10-18 2013-10-18 C200 strength-grade concrete for formed steel concrete composite structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310493466.5A CN103553460B (en) 2013-10-18 2013-10-18 C200 strength-grade concrete for formed steel concrete composite structure

Publications (2)

Publication Number Publication Date
CN103553460A true CN103553460A (en) 2014-02-05
CN103553460B CN103553460B (en) 2015-06-10

Family

ID=50007880

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310493466.5A Expired - Fee Related CN103553460B (en) 2013-10-18 2013-10-18 C200 strength-grade concrete for formed steel concrete composite structure

Country Status (1)

Country Link
CN (1) CN103553460B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294006A (en) * 2015-10-23 2016-02-03 上海建工集团股份有限公司 C100-C120 graded ultrahigh-strength concrete having high workability
CN105601200A (en) * 2015-12-25 2016-05-25 西安建筑科技大学 Concrete with strength grade of C35 for steel reinforced concrete composite structures
CN105621995A (en) * 2015-12-25 2016-06-01 西安建筑科技大学 Concrete with strength grade C30 for steel reinforced concrete composite structure
CN105693170A (en) * 2016-04-08 2016-06-22 西安建筑科技大学 C210-strength-level concrete for steel reinforced concrete composite structures
CN105777017A (en) * 2016-04-08 2016-07-20 西安建筑科技大学 Concrete for steel reinforced concrete composite structure C250 strength grade
CN105837119A (en) * 2016-04-08 2016-08-10 西安建筑科技大学 Concrete used for steel reinforced concrete composite structure and having C230 strength grade
CN105859216A (en) * 2016-04-08 2016-08-17 西安建筑科技大学 Concrete of strength grade C220 for steel reinforced concrete combined structure
CN105906258A (en) * 2016-04-08 2016-08-31 西安建筑科技大学 Concrete having strength grade of C240 and used for steel reinforced concrete combined structure
CN106186884A (en) * 2016-07-19 2016-12-07 四川大学 A kind of tough abrasion-proof concrete of superelevation and preparation method thereof
CN105439517B (en) * 2015-12-25 2018-02-27 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C45 strength grades

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63288935A (en) * 1987-05-22 1988-11-25 Denki Kagaku Kogyo Kk Ultra-high strength cement composition
JPS63303839A (en) * 1987-06-02 1988-12-12 Tokyo Electric Power Co Inc:The Production of concrete or the like
CN101913815A (en) * 2010-08-18 2010-12-15 西安建筑科技大学 Concrete with strength grade of C140 used for profile steel-concrete composite structure
CN101913822A (en) * 2010-08-18 2010-12-15 西安建筑科技大学 C150 (strength grade) concrete for section steel-concrete combined structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63288935A (en) * 1987-05-22 1988-11-25 Denki Kagaku Kogyo Kk Ultra-high strength cement composition
JPS63303839A (en) * 1987-06-02 1988-12-12 Tokyo Electric Power Co Inc:The Production of concrete or the like
CN101913815A (en) * 2010-08-18 2010-12-15 西安建筑科技大学 Concrete with strength grade of C140 used for profile steel-concrete composite structure
CN101913822A (en) * 2010-08-18 2010-12-15 西安建筑科技大学 C150 (strength grade) concrete for section steel-concrete combined structure

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294006A (en) * 2015-10-23 2016-02-03 上海建工集团股份有限公司 C100-C120 graded ultrahigh-strength concrete having high workability
CN105601200A (en) * 2015-12-25 2016-05-25 西安建筑科技大学 Concrete with strength grade of C35 for steel reinforced concrete composite structures
CN105621995A (en) * 2015-12-25 2016-06-01 西安建筑科技大学 Concrete with strength grade C30 for steel reinforced concrete composite structure
CN105439517B (en) * 2015-12-25 2018-02-27 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C45 strength grades
CN105906258A (en) * 2016-04-08 2016-08-31 西安建筑科技大学 Concrete having strength grade of C240 and used for steel reinforced concrete combined structure
CN105837119A (en) * 2016-04-08 2016-08-10 西安建筑科技大学 Concrete used for steel reinforced concrete composite structure and having C230 strength grade
CN105859216A (en) * 2016-04-08 2016-08-17 西安建筑科技大学 Concrete of strength grade C220 for steel reinforced concrete combined structure
CN105777017A (en) * 2016-04-08 2016-07-20 西安建筑科技大学 Concrete for steel reinforced concrete composite structure C250 strength grade
CN105693170A (en) * 2016-04-08 2016-06-22 西安建筑科技大学 C210-strength-level concrete for steel reinforced concrete composite structures
CN105837119B (en) * 2016-04-08 2017-09-19 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C230 strength grades
CN105906258B (en) * 2016-04-08 2017-09-19 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C240 strength grades
CN105777017B (en) * 2016-04-08 2017-10-24 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C250 strength grades
CN105859216B (en) * 2016-04-08 2017-11-10 西安建筑科技大学 A kind of concrete for reinforced concrete composite structure C220 strength grades
CN106186884A (en) * 2016-07-19 2016-12-07 四川大学 A kind of tough abrasion-proof concrete of superelevation and preparation method thereof
CN106186884B (en) * 2016-07-19 2018-08-03 四川大学 A kind of tough abrasion-proof concrete of superelevation and preparation method thereof

Also Published As

Publication number Publication date
CN103553460B (en) 2015-06-10

Similar Documents

Publication Publication Date Title
CN103553458B (en) C180 strength-grade concrete for formed steel concrete composite structure
CN103553459B (en) C190 strength-grade concrete for formed steel concrete composite structure
CN103553460B (en) C200 strength-grade concrete for formed steel concrete composite structure
CN103539407B (en) Concrete for steel reinforced concrete combined structure with C160 strength level
CN103553494B (en) C170 strength-grade concrete for formed steel concrete composite structure
CN101913815B (en) Concrete with strength grade of C140 used for profile steel-concrete composite structure
CN101913822B (en) C150 (strength grade) concrete for section steel-concrete combined structure
CN101250040B (en) Concrete with strength grade of C100 used for steel reinforced concrete combined structure
CN105693170B (en) A kind of concrete for reinforced concrete composite structure C210 strength grades
CN105837119B (en) A kind of concrete for reinforced concrete composite structure C230 strength grades
CN105906258B (en) A kind of concrete for reinforced concrete composite structure C240 strength grades
CN105481317B (en) A kind of concrete for reinforced concrete composite structure C50 strength grades
CN105439517B (en) A kind of concrete for reinforced concrete composite structure C45 strength grades
CN105621995B (en) A kind of concrete for reinforced concrete composite structure C30 strength grades
CN101913816B (en) C130 (strength grade) concrete for section steel-concrete combined structure
CN101195530B (en) Concrete with strength grade of C70 for section steel concrete composite structure
CN105777017B (en) A kind of concrete for reinforced concrete composite structure C250 strength grades
CN105859216B (en) A kind of concrete for reinforced concrete composite structure C220 strength grades
CN105601202B (en) A kind of concrete for reinforced concrete composite structure C55 strength grades
CN100577598C (en) Concrete with strength grade of C90 for section steel concrete composite structure
CN105481318B (en) A kind of concrete for reinforced concrete composite structure C40 strength grades
CN105601200B (en) A kind of concrete for reinforced concrete composite structure C35 strength grades
CN101921092B (en) Concrete for profiled steel concrete composite structure with C110 in strength grade
CN101913823B (en) Concrete with strength grade of C120 for section steel concrete combination structure
CN101195532B (en) Concrete with strength grade of C80 for section steel concrete composite structure

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150610

Termination date: 20181018

CF01 Termination of patent right due to non-payment of annual fee