CN101412607A - High flowing anticracking concrete with ultralong structure - Google Patents
High flowing anticracking concrete with ultralong structure Download PDFInfo
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- CN101412607A CN101412607A CNA2007100472426A CN200710047242A CN101412607A CN 101412607 A CN101412607 A CN 101412607A CN A2007100472426 A CNA2007100472426 A CN A2007100472426A CN 200710047242 A CN200710047242 A CN 200710047242A CN 101412607 A CN101412607 A CN 101412607A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a formulation using a concrete having the characteristics of big fluidity, radiation protection, crack resistance and the like, and a process thereof under the condition of overlong structure, wherein the formulation comprises the components of R25 water reducing agent, 42.5 grade cement, S95 mineral powder, stage-II fly ash, gravels of between 5 and 25 millimeters, and medium sand the fineness modulus of which is between 2.3 and 2.6, the silt content of which is less than or equal to 1.0 percent, and the clod content of which is less than or equal to 0.5 percent; the dosage ratios of the materials in a single formulation are 0.012, 1.00, 0.42, 0.42, 5.89, 4.44, and 0.89 of water. The process also comprises a process for maintaining a bottom plate concrete, a roof plate concrete and the like. Through optimized distribution and reasonable material selection and under the condition of ensuring the pouring performance and strength of the concrete, the process can improve the concrete performance, reduce creeps and shrinkages, and effectively control the generation of concrete cracks. Under the condition of satisfying the requirement on concrete construction, the process reduces the amount of free water in the concrete so as to achieve the effects of low shrinkage, crack resistance and good durability.
Description
Technical field:
The present invention relates to the build concrete technical field, specifically refer to the prescription and the technology thereof of a kind of suitable super-long structural large fluidity, radioprotective, anti-crack concrete.
Background technology:
At the overlength degree is under the storage annular structural condition of 432m, and service requirements has the concrete of characteristics such as large fluidity, radioprotective, anticracking and for guaranteeing construction quality, effectively controls fissured concrete, and design proposes following 3 technical requirementss:
1. the through crack that must not occur vertical wall face width degree ≧ 0.15mm on the concrete walls plate structure;
2. require low (the 360d contraction Zhi ≦ 500*10 of concrete shrinkage value
-6);
3. be easy to build and closely knit moulding;
4. the concrete mix needs than high slump (≧ 180mm), little (the 1h Sun Shi ≦ 20mm) of on-the-spot slump-loss.In view of the above, under the prior art condition, also beyond example.
Summary of the invention:
The present invention mainly is that the minimizing distress in concrete is a purpose with the reduction concrete shrinkage.In view of above-mentioned condition, following 2 technological lines are proposed at concrete the present invention of requirement of characteristics such as super-long structural, upper flow regime, radioprotective, anticrackings:
1. a certain amount of flyash of admixture, breeze improve pumpability of concrete in concrete, improve concrete weather resistance.
2. abandon the normal mode that uses common or middle effect water reducer concrete batching, use the low shrinkage concrete of novel polycarboxylic acid series high efficiency water reducing agent preparation.
By abovementioned technology and make concrete reach the and the following excellent properties:
1. under the condition that guarantees concrete strength, improve workability of concrete;
2. under given workability condition, reduce water cement ratio, improve concrete intensity and weather resistance;
3. under the condition that guarantees concrete depositing performance and intensity, reduce water and cement consumption, reduce creep, the factor of concrete initial imperfection that drying shrinkage, hydration heat of cement etc. cause;
4. the slump keeps performance good, through the time slump-loss little;
5. environmentally safe.
Below be related to the present invention researching and analysing
One, prior art analysis
1. wooden calcium, naphthalene water reducer are to the impact analysis of concrete shrinkage value
Provide according to relevant documents and materials mix wooden calcium, naphthalene series additive concrete shrinkage test-results is as shown in the table
Table 1 is mixed wooden calcium, naphthalene water reducer concrete shrinkage test-results
The low shrinkage concrete proportioning design of C30R28
The proportioning of the C30R28 anti-crack concrete of R25 polycarboxylate water-reducer preparation
The table 2 C30R28 slump: 150 ± 30mm unit: kg/m
3
Test-results and analysis
Table 3 C30R28 anti-crack concrete performance test data.
By as can be seen to the concrete performance test data of described R25 polycarboxylate water-reducer preparation, not only serviceability is good for the C30R28 concrete of R25 polycarboxylate water-reducer preparation, strength property adheres to specification, and by with the wooden calcium of table 1, naphthalene water reducer the contrast of concrete shrinkage value and accompanying drawing 4 being mixed concrete and the normal concrete that wooden calcium, naphthalene system, polycarboxylate water-reducer concrete shrinkage curve figure in the different length of time concrete shrinkage value that (water-reducing rate is about 20%) mixes the R25 polycarboxylate water-reducer under common volume as can be seen all is lower than other water reducers.
2. conclusion (of pressure testing) and innovative approach
In the volume scope of routine, not only play diminishing enhanced effect 2.1 mix polycarboxylic acids dehydragent (R25), and concrete shrinkage value also all is lower than and mixes the concrete shrinkage value of other admixtures, prevents that for reducing concrete contraction the crack from producing is favourable.
2.2 guaranteeing concrete workability, help under the prerequisite of pumping, the principle of following aggregate volume content maximum is carried out the further optimization of concrete mix.Reduce the sand coarse aggregate ratio in the proportioning, target value is 43%.
2.3 under the condition that satisfies the concrete construction requirement, further reduce unit consumption of water, to reduce the quantity of free-water in the concrete.The every side 160Kg of target value.
2.4 under the prerequisite that guarantees concrete strength, further reduce single cement consumption,, effectively control concrete fissured generation to reduce the hydration heat that produces in the cement hydration process.
Two, about the analysis of R25 polycarboxylate water-reducer performance index
The mechanism of action of R25 polycarboxylate water-reducer
The mechanism of action of R25 high-efficiency water-reducing agent of poly-carboxylic acid is with electrostatic repulsion, and sterically hindered is main.
The electrostatic repulsion effect is the electrostatic double layer of poly carboxylic acid series water reducer in the absorption and the formation at cement granules interface, make between cement granules and to produce static and scold stress, making concrete begin mobile surrender shear-stress reduces, thereby the cement granules of agglomerated is dispersed, slip ability increase has mutually improved workability between cement granules; Simultaneously concrete water consumption be can effectively control, mechanical property and durability requirement guaranteed.
Sterically hindered effect is that poly carboxylic acid series water reducer is adsorbed on cement particle surface, forms the thicker polymer molecule adsorption layer of one deck.When cement granules was close mutually, adsorption layer was overlapped, can produce the repulsion effect between cement granules, and overlapping many more, repulsion is big more, is referred to as sterically hindered repulsion (as shown in Figure 2).The R25 polycarboxylate water-reducer is because its main chain is shorter, side chain is longer, and main chain is adsorbed on cement surface, and long side chain and short-side chain random groups are closed and be grafted on the main chain, in solution, fully stretch, form thick solvation skin, because sterically hindered repulsion effect, make and repel mutually between the cement granules and disperse, stop the interparticle cohesion of cement effectively, help the release of free-water, improve workability, reduce the concrete water yield of mixing; The thicker polymer molecule adsorption layer of Xing Chenging simultaneously, make initial hydrated cementitious product water reducer molecular adsorption layer be covered than difficult, still can keep higher sterically hindered, make this water reducer longer effective acting time, can strengthen the slump and keep performance at cement particle surface.
The present invention mainly is that the minimizing distress in concrete is a purpose with the reduction concrete shrinkage.By above-mentioned water-reduction mechanism research to polycarboxylate water-reducer as can be seen, determined the electrostatic repulsion effect of comparing of mainly leaning on to improve cement particle dispersiveness just because of R25 polycarboxylate water-reducer chemical structure characteristics, reduce the coventional type water reducer and the naphthalene series high-efficiency water-reducing agent of water cement ratio, the R25 polycarboxylate water-reducer passes through electrostatic repulsion, sterically hindered repulsion combines can more effective raising cement particle dispersiveness, discharge free-water, reduce water consumption and cement consumption, reduce water cement ratio, thereby not only obtain the workability energy and the slump and keep the outstanding concrete mix of performance, and the contraction of base concrete can more effectively be fallen, reduce concrete crack.
The constructional feature of R25 polycarboxylate water-reducer
The molecule of RHOEPLUS25 (PCE) structure is and has a plurality of active groups on the main chain, and polarity is stronger, and side chain has hydrophilic polyether segment, and chain is longer, and quantity is many, and the molecule segment of hydrophobic group is shorter, comparatively small amt.The molecular structure model of high performance water reducing agent of polyocarboxy acid as shown in Figure 3.
Table 4 R25 water reducer homogeneity index
| Project | Density (200C) | Solid content (%) | Chloride ion content (%) | PH value | Mortar water-reducing rate (%) |
| Technical requirements | 1.05± 0.02 | 22.03± 1.32 | ≦0.20 | 7.0± 1.0 | ≧20 |
Concrete of the present invention is made up of admixture, cement, breeze, flyash coarse aggregate and fine aggregate, wherein:
Admixture: R25 polycarboxylate water-reducer
Cement: 42.5 grades of ordinary Portland cements, hydration heat is low, and is good with R25 water reducer consistency
Breeze: S95 level breeze
Flyash: II level flyash
Coarse aggregate: 5-25mm rubble
Fine aggregate: fineness modulus is in (2.3～2.6), Han Ni Liang ≦ 1.0%, the medium sand of clod Han Liang ≦ 0.5%
Proportioning
Cement: folk prescription usage ratio: 1.00;
Flyash: folk prescription usage ratio: 0.42;
Breeze: specification: S95 folk prescription usage ratio: 0.42;
Water: folk prescription usage ratio: 0.89;
Sand: folk prescription usage ratio: 4.44;
Rubble: folk prescription usage ratio: 5.89;
Rubble: folk prescription usage ratio: 5.89;
Admixture: folk prescription usage ratio: 0.012.
Maintaining process of the present invention
In view of the variation of the weather in the construction process, season and outside air temperature condition is big, to concrete curing, particularly insulation, moisture-keeping maintaining is particularly in view of the above important:
1. bottom board concrete, top board concrete curing:
Smash end 1.1. concrete waters, treat that its initial set begins, i.e. lid layer plastics film, lid layer gunnysack maintenance again plays the heat and moisture preserving effect above.At plastics film, under the gunnysack coverage condition, heat and moisture preserving can be given full play to the concrete characteristic of creeping, and reduces thermal stress, reduces concrete cooling gradient, the harmful fissured appearance of control;
1.2. curing time must not be less than 14 days;
1.3. should under temperature measurement data instructs, after promptly temperature reaches peak-peak, be falling trend, when inner and free air temperature difference less than 20 ℃, can partly lift gunnysack.
1.4. all gunnysack can not all lift on the same day or lift in flakes, should divide and carry out in two days, can only adopt interval folder flower mode to lift about 1/2, temperature is progressively left by limited space in first day, avoid rapid cooling, the gunnysack of remaining part should lift second day noon.
2. wall top plate concrete curing
Keep the template time lengthening early stage, concrete external parcel double-plastic maintenance (or the plug-in gunnysack of layer of plastic film) is adopted in suitable form removal after 5～7 days immediately after the later stage form removal.Form removal and parcel plastics film answer segmentation to carry out; the parcel plastics film should overlap and carries out, and lap-joint seals with sealing tape, in order to guarantee the curing time of not contaminated and long period of body of wall; plastic protective film should keep always, can remove when influencing the later process construction.
Description of drawings:
Fig. 1-1,1-2 are bottom board concrete of the present invention, top board concrete and the technical process of wall top plate concrete curing;
Fig. 2 is the molecular structure model of a kind of admixture R2 high-efficiency water-reducing agent of poly-carboxylic acid of the present invention;
Fig. 3 is the sterically hindered effect synoptic diagram of a kind of admixture R25 high-efficiency water-reducing agent of poly-carboxylic acid of the present invention;
Fig. 4 is a kind of admixture shrinkage curve figure in the different length of time of the present invention;
Fig. 5-1,5-2 are the effect photo of embodiments of the invention.
Below in conjunction with accompanying drawing anti-crack concrete of the present invention is further described
Concrete of the present invention, form by admixture, cement, breeze, flyash coarse aggregate and fine aggregate:
Described admixture is the R25 polycarboxylate water-reducer;
Cement is 42.5 grades of ordinary Portland cements, and hydration heat is low, with R25 water reducer consistency good (so-and-so cement mill product);
Breeze: S95 level breeze (Anhui so-and-so building materials company limited product)
Flyash: II level flyash (so-and-so Industrial Co., Ltd. of Shanghai produces)
Coarse aggregate: 5-25mm rubble (originate from Zhejiang so-and-so)
Fine aggregate: fineness modulus is in (2.3～2.6), Han Ni Liang ≦ 1.0%, the medium sand of clod Han Liang ≦ 0.5% (originate from Wuhu so-and-so)
One embodiment of the present of invention
With the strength grade is that C30 is an example, and its concrete mix is as follows:
Cement: P042.5; Folk prescription usage ratio: 1.00;
Flyash: II level ash; Folk prescription usage ratio: 0.42;
Breeze: S95; Folk prescription usage ratio: 0.42;
Water: tap water; Folk prescription usage ratio: 0.89;
Sand: medium sand; Folk prescription usage ratio: 4.44;
Rubble: 5-25mm; Folk prescription usage ratio: 5.89;
Admixture: R25; Folk prescription usage ratio: 0.012.
Concrete making technology of the present invention
In view of the variation of the weather in the construction process, season and outside air temperature condition is big, to concrete curing, particularly insulation, moisture-keeping maintaining is particularly in view of the above important:
1. bottom board concrete, top board concrete curing:
Smash end 1.1. concrete waters, treat that its initial set begins, i.e. lid layer plastics film, lid layer gunnysack maintenance again plays the heat and moisture preserving effect above.At plastics film, under the gunnysack coverage condition, heat and moisture preserving can be given full play to the concrete characteristic of creeping, and reduces thermal stress, reduces concrete cooling gradient, the harmful fissured appearance of control;
1.2. curing time must not be less than 14 days;
1.3. should under temperature measurement data instructs, after promptly temperature reaches peak-peak, be falling trend, when inner and free air temperature difference less than 20 ℃, can partly lift gunnysack;
1.4. all gunnysack can not all lift on the same day or lift in flakes, should divide and carry out in two days, can only adopt interval folder flower mode to lift about 1/2, temperature is progressively left by limited space in first day, avoid rapid cooling, the gunnysack of remaining part should lift second day noon.
2. wall top plate concrete curing
Keep the template time lengthening early stage, concrete external parcel double-plastic maintenance (or the plug-in gunnysack of layer of plastic film) is adopted in suitable form removal after 5～7 days immediately after the later stage form removal.Form removal and parcel plastics film answer segmentation to carry out; the parcel plastics film should overlap and carries out, and lap-joint seals with sealing tape, in order to guarantee the curing time of not contaminated and long period of body of wall; plastic protective film should keep always, can remove when operation is constructed up to the influence back.
The every performance test result of one embodiment of the present of invention C30R28 anti-crack concrete
1. concrete mixing performance
Table 5 concrete mixing performance
2. concrete crushing strength statistical evaluation
Table 6 concrete strength statistical evaluation
| Strength grade | Average strength MPa | Maximum of intensity MPa | Minimum of intensity MPa | Standard deviation |
| C30 | 40.4 | 47.2 | 34.4 | 2.37 |
3. concrete shrinkage value ε * 10
-6And compression strength value
Table 7 C30R28 concrete shrinkage, intensity level
| The length of time | Shrinkage | Intensity level | |
| 3d | 52 | 8 | |
| 7d | 91 | 20.8 | |
| 14d | 136 | 26.8 | |
| 28d | 227 | 39.6 |
| 45d | 265 | 40.3 |
| 60d | 285 | 40.3 |
| 90d | 311 | 44.6 |
| 120d | 317 | 45.2 |
| 150d | 330 | 48.1 |
| 180d | 337 | 47.7 |
| 270d | 343 | / |
| 360d | 343 | / |
4. concrete freezing and thawing test value
Table 8 concrete reference block intensity
Table 9 concrete reaches the freezing and thawing test value of D25
5. concrete impermeability test result
Table 10 concrete impermeability test value
| Strength grade | Sample dimensions | The impervious grade of 60d | The impervious grade of 90d | Qualified judgement |
| C30 | Φ175*185*150mm | P16 | P16 | Qualified |
Test result analysis
1.C30 anti-crack concrete has embodied good workability energy in application in engineering, goes out machine slump basic controlling at 180mm, the loss of the slump of 1h also about 20mm, has been satisfied the requirement of required upper flow regime of pumping construction and low slump loss.
2. air content is less, and concrete body has revealed density preferably.
3. strength property meets the requirement of engineering design fully, and quality control level is better.
4. embodied anti-crack concrete favorable durability energy:
4.1 the concrete sample of normal curing has embodied less shrinkage value, can satisfy the low requirement of shrinking of engineering, helps fissured control.
4.2 by 25 freezing and thawing tests, concrete sample rate of weight loss and loss of strength rate are all less, have embodied the good anti-freezing property of anti-crack concrete.
4.3 the impervious grade of C30 anti-crack concrete can reach P16, has good anti-permeability performance.
4.4 C30 anti-crack concrete water consumption is reduced to 160kg, cement consumption is reduced to that 180kg, mineral admixture consumption improve, sand coarse aggregate ratio is reduced to 43%, by these innovative approachs, make engineering use concrete body and revealed than the more excellent low-shrinkage energy of test concrete.
4.5 after the on-the-spot structure form removal, any surface finish, no naked eyes visible crack, surperficial little bubble.(shown in accompanying drawing 5-1,5-2).
The present invention has in sum
1. by the accumulative total application side amount nearly 20000m of C30 anti-crack concrete in engineering3, its service behaviour, strength character, endurance quality have all embodied good effect, have satisfied the requirement that engineering is hanged down contraction, anticracking.
2. for the Optimization of anti-crack concrete, answer the choose reasonable raw material
2.1 additive can be selected poly carboxylic acid series water reducer. Poly carboxylic acid series water reducer is because its unique mechanism of action, can be under the condition that guarantees pouring concrete performance and intensity, improve the concrete work performance, reduce the ratio of mud, reduce water and cement consumption, reduce the heat of hydration, minimizing is crept and is shunk, and is conducive to improve concrete strength and endurance quality.
Under the prerequisite that guarantees concrete strength, further reduce single cement consumption, to reduce the heat of hydration that produces in the cement hydration process, effectively control the generation in concrete crack. Under the condition that satisfies the concrete construction requirement, further reduce unit consumption of water, to reduce the quantity of free water in the concrete. The every side 160Kg of desired value.
2.2 cement should be selected and the good middle heat of additive compatibility and the portland cement of low-heat, reduces the heat of hydration, is conducive to reduce concrete contraction, the generation in control crack.
2.3 should select modulus of fineness between (2.3～2.6), contain mud amount＜=1.0%, the medium sand modulus of fineness of the clod amount of containing＜=0.5% can make concrete obtain good workability energy between (2.3～2.6); Clay content, clod too high levels can strengthen the consumption of water consumption and additive, strengthen concrete contraction, reduce concrete intensity and durability.
3. for the preparation of anti-crack concrete, should follow the principle of aggregate volume content maximum, take full advantage of the physical effect of breeze, flyash admixture and fill effect, reduce cement consumption, increase concrete density, improve working performance of fresh concrete, reduce concrete contraction, strengthen concrete endurance quality.
Guaranteeing concrete workability, be conducive under the prerequisite of pumping, the principle of following aggregate volume content maximum is carried out the further optimization of concrete mix. Reduce the sand coarse aggregate ratio in the match ratio, desired value is 43%.
4. for the application of anti-crack concrete, take into full account raw material, proportion design, maintenance to the impact of concrete shrinkage crack.
Claims (2)
1. a high flowing anticracking concrete with ultralong structure is made up of admixture, cement, breeze, flyash coarse aggregate and fine aggregate, it is characterized in that,
Admixture: R25 polycarboxylate water-reducer;
Cement: good with R25 water reducer consistency, 42.5 grades of ordinary Portland cements that hydration heat is low;
Breeze: S95 level breeze;
Flyash: II level flyash;
Coarse aggregate: 5-25mm rubble;
Fine aggregate: fineness modulus is 2.3～2.6, Han Ni Liang ≦ 1.0%, the medium sand of clod Han Liang ≦ 0.5%;
Its proportioning is as follows:
Cement: P042.5; Folk prescription usage ratio: 1.00;
Flyash: II level ash; Folk prescription usage ratio: 0.42;
Breeze: S95 folk prescription usage ratio: 0.42;
Water: tap water; Folk prescription usage ratio: 0.89;
Sand: the medium sand fineness modulus is 2.3～2.6; Folk prescription usage ratio: 4.44;
Rubble: 5-25mm; Folk prescription usage ratio: 5.89;
Admixture: R25; Folk prescription usage ratio: 0.012.
2. the maintaining process of high flowing anticracking concrete with ultralong structure as claimed in claim 1:
A. bottom board concrete, top board concrete curing
A.1 with the heat and moisture preserving effect, water at concrete and to smash end, treat that its initial set begins, i.e. lid layer plastics film, lid layer gunnysack more above;
A.2. the time must not be less than 14 days;
A.3. under temperature measurement data instructs, after temperature reaches peak-peak, be falling trend, when inner and free air temperature difference less than 20 ℃, can partly lift gunnysack;
A.4. gunnysack can not all lift on the same day or lift in flakes, should divide and carry out in two days; Can only adopt interval folder flower mode to lift about 1/2 in first day, temperature is progressively left by limited space, avoid rapid cooling, the gunnysack of remaining part should lift second day noon;
B. wall top plate concrete curing
B.1 keeping the template time need prolong in early stage, suitable form removal after 5～7 days;
B.2 in the later stage, adopt concrete external parcel double-plastic or the plug-in gunnysack of layer of plastic film after the form removal immediately;
B.3 form removal and parcel plastics film answer segmentation to carry out; the parcel plastics film answers overlapping mode to carry out, and lap-joint seals with sealing tape, in order to guarantee the curing time of not contaminated and long period of body of wall; plastic protective film should keep always, can remove when influencing the later process construction.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891426A (en) * | 2010-08-04 | 2010-11-24 | 中铁二局股份有限公司 | Low-creep C60 high-performance concrete |
| CN101962283A (en) * | 2010-09-30 | 2011-02-02 | 天津二十冶建设有限公司 | Super-thick large-volume foundation anti-cracking concrete |
| CN102320798A (en) * | 2011-09-14 | 2012-01-18 | 中铁十二局集团有限公司 | Low-elastic modulus and high-performance concrete |
| CN102399074A (en) * | 2011-08-01 | 2012-04-04 | 深圳市安托山混凝土有限公司 | Ultra-thick C50P10 anti-cracking concrete for engineering use |
| CN102617081A (en) * | 2012-04-05 | 2012-08-01 | 上海建工材料工程有限公司 | High-flow low-shrinkage C30 concrete capable of shielding radiation |
| CN103570322A (en) * | 2013-10-30 | 2014-02-12 | 殷建军 | High-quantity mineral powder doped underwater concrete pile |
| CN107417203A (en) * | 2017-06-27 | 2017-12-01 | 黄河勘测规划设计有限公司 | A kind of moisturizing self-maintenance concrete pouring material |
| CN107572982A (en) * | 2017-10-18 | 2018-01-12 | 北京建工路桥工程建设有限责任公司 | A kind of ultra-long concrete mixture and its construction method for pouring wall |
| CN109400022A (en) * | 2018-11-13 | 2019-03-01 | 江苏省安捷岩土工程有限公司 | A kind of ultra-large volume high intensity low hydration heat concrete |
| CN109485323A (en) * | 2018-12-26 | 2019-03-19 | 广东红墙新材料股份有限公司 | Early strong viscosity reduction type polycarboxylate water-reducer is preparing the purposes in prefabricated components concrete |
| CN113513166A (en) * | 2021-07-01 | 2021-10-19 | 成都建工路桥建设有限公司 | Construction method of super-long structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891426A (en) * | 2010-08-04 | 2010-11-24 | 中铁二局股份有限公司 | Low-creep C60 high-performance concrete |
| CN101962283A (en) * | 2010-09-30 | 2011-02-02 | 天津二十冶建设有限公司 | Super-thick large-volume foundation anti-cracking concrete |
| CN102399074A (en) * | 2011-08-01 | 2012-04-04 | 深圳市安托山混凝土有限公司 | Ultra-thick C50P10 anti-cracking concrete for engineering use |
| CN102320798B (en) * | 2011-09-14 | 2012-11-21 | 中铁十二局集团有限公司 | Low-elastic modulus and high-performance concrete |
| CN102320798A (en) * | 2011-09-14 | 2012-01-18 | 中铁十二局集团有限公司 | Low-elastic modulus and high-performance concrete |
| CN102617081B (en) * | 2012-04-05 | 2013-11-06 | 上海建工材料工程有限公司 | High-flow low-shrinkage C30 concrete capable of shielding radiation |
| CN102617081A (en) * | 2012-04-05 | 2012-08-01 | 上海建工材料工程有限公司 | High-flow low-shrinkage C30 concrete capable of shielding radiation |
| CN103570322A (en) * | 2013-10-30 | 2014-02-12 | 殷建军 | High-quantity mineral powder doped underwater concrete pile |
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| CN107572982A (en) * | 2017-10-18 | 2018-01-12 | 北京建工路桥工程建设有限责任公司 | A kind of ultra-long concrete mixture and its construction method for pouring wall |
| CN109400022A (en) * | 2018-11-13 | 2019-03-01 | 江苏省安捷岩土工程有限公司 | A kind of ultra-large volume high intensity low hydration heat concrete |
| CN109485323A (en) * | 2018-12-26 | 2019-03-19 | 广东红墙新材料股份有限公司 | Early strong viscosity reduction type polycarboxylate water-reducer is preparing the purposes in prefabricated components concrete |
| CN109485323B (en) * | 2018-12-26 | 2021-07-23 | 广东红墙新材料股份有限公司 | Application of early-strength viscosity-reduction type polycarboxylate superplasticizer in preparation of precast concrete |
| CN113513166A (en) * | 2021-07-01 | 2021-10-19 | 成都建工路桥建设有限公司 | Construction method of super-long structure |
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Application publication date: 20090422 |