CN101172808A - High crack-proof, impervious composite material for concrete and producing method thereof - Google Patents
High crack-proof, impervious composite material for concrete and producing method thereof Download PDFInfo
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- CN101172808A CN101172808A CNA2007101339234A CN200710133923A CN101172808A CN 101172808 A CN101172808 A CN 101172808A CN A2007101339234 A CNA2007101339234 A CN A2007101339234A CN 200710133923 A CN200710133923 A CN 200710133923A CN 101172808 A CN101172808 A CN 101172808A
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- concrete
- matrix material
- cracking resistance
- swelling agent
- impervious matrix
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00275—Materials impermeable to vapours or gases
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- 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
- C04B2111/343—Crack resistant materials
-
- 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 high anti-cracking and high anti-penetrating composite material for concrete and the preparation method thereof, and contains the following components according to the weight ratio: expansion agent of 80 to 99 percent, synthetic fibre of 0.5 to 4.0 percent, water retention agent of 0 to 4.0 percent and water reducing agent of 0 to 12 percent. The preparation method comprises the steps as follows: mixing the components till the coefficient of dispersion of the distributed synthetic fibre is less than 0.03. The invention having the advantages of simple preparation method and low cost greatly simplifies the production art of the concrete and brings higher anti-cracking and anti-penetrating abilities of the concrete.
Description
[technical field]
The present invention relates to a kind of concrete with high cracking resistance, high impervious matrix material and production method thereof, belong to technical field of concrete additives.This matrix material can be used for requirements such as various concrete construction engineering, especially water conservancies, harbour, bridge, underground, pond, roofing high impervious, and overlength, super wide, concrete structure that super large requires high cracking resistance.
[background technology]
Cement concrete mainly consist of cement slurry and gathering materials, cement slurry exists bigger chemical shrinkage and dry shrinkage in aquation and process of setting.When this shrinkage strain was restricted, inside concrete will produce bigger tensile stress.In addition, the effect of external load, variation of temperature etc. all can cause the generation of inside concrete stress.Cement concrete is a kind of hard brittle material, tensile strength is low, when the tensile stress of hardened cement paste contraction generation surpasses its tensile strength, will produce the crack, not only make concrete intensity reduce, and weather resistance such as its impermeability, frost resistance, solidity to corrosion are reduced greatly.Since cement concrete was arranged, crack problem was the technical barrier of puzzlement construction work circle always.
The technological approaches that improves cracking of reinforced concrete at present mainly contains two: the one, and when concrete batching, add the swelling agent compensating concrete and shrink, the 2nd, add synthon and improve concrete fragility.The anticracking principle of these two kinds of methods, effect aspect, the mode of action and effective function period are inequality.Swelling agent mainly is by the contraction in sclerosis stage of chemical action compensating concrete, but little to suppressing the effect of concrete early-age plastic shrinkage; And synthon have tangible effect for the early stage plastic shrinkage cracking of control concrete, but are difficult to helpful again in the sclerosis stage.Therefore only depend on single interpolation swelling agent or synthon all can not solve concrete crack problem fully.Two technology of mixing of adding swelling agent and synthon are also arranged during engineering is used at present, when concrete construction, fiber and swelling agent add respectively as independent component at concrete mixing plant or working-yard, because the proportioning of two kinds of materials is without optimization, there is certain randomness, can not obtains best additive effect.Simultaneously, because the complicated diversity that starting material bring will be brought quality control difficulty and the unclear realistic problem of responsibility.Therefore, the single product of a kind of swelling agent of market demand and fiber compositeization.Yet, produce swelling agent and synthon compound single product, the big dispersiveness of volume fiber in dry powder is a still unsolved technical barrier.
In addition, the concrete that contains swelling agent has characteristics, and promptly swelling agent water requirement in hydration process is bigger, inner drying speed is fast, so the curing condition harshness, necessary water storing conservation in building back 14 d, otherwise not only do not have the effect that improves the concrete anticracking barrier properties, can run counter to desire on the contrary.
[summary of the invention]
The present invention is directed to the existing technical problem in above-mentioned concrete anticracking antiseepage aspect, provide a kind of concrete with high cracking resistance, high impervious matrix material and production method thereof.
For solving the problems of the technologies described above, the present invention is formulated by weight by following component: swelling agent 80～99%, synthon 0.5～4.0%, water-holding agent 0～4.0%, water reducer 0～12%.
Described swelling agent is the calcium sulphoaluminate class cement expansive material that satisfies the JC467-2001 standard-required.
The calcium sulphoaluminate class cement expansive material of stating clearly is selected from aluminite swelling agent, UEA swelling agent, AEA swelling agent or HEA swelling agent.
Described synthon are selected from one or more assorted fibres by arbitrary proportion in polypropylene fibre, polyacrylonitrile fibre, the tynex.
Described water-holding agent is selected from the composition of one or more arbitrary proportions of Walocel MT 20.000PV ether, TYLOSE 30000 or xylon.
Described water reducer is solid high-efficiency water reducer or the solid efficient retarding and water reducing agent that satisfies the GB8076-1997 standard-required, a kind of in preferred naphthalenesulfonate formaldehyde condensation compound based water reducer or the poly carboxylic acid series water reducer.
Production method of the present invention is mixed to the deviation coefficient of wherein synthon distribution less than 0.03 with described each component.
Described mixing preferably adopts two-stage to mix, and the first step is that agravic mixer mixes, and the second stage is that helical ribbon agitator mixes, and wherein feeding intake of synthon is blown in the agravic mixer by gas blower.
The present invention cooperates by swelling agent, synthon, water-holding agent and high efficiency water reducing agent optimization, adopts the wind loosen collagen fibre to feed intake and the two-stage hybrid technology, and said components is mixed into a kind of uniform fibre-bearing powder body material.The optimization of swelling agent and synthon cooperates makes two different class materials of anticracking mechanism, effect aspect, the mode of action and effective function period produce the optimum stacking effect from chemistry and physics two aspects synergy; Water-holding agent can significantly improve concrete water retention, reduces concrete plasticity and dry shrinkage; High efficiency water reducing agent can effectively improve concrete pumping power, improves concrete density, play early strong, enhanced effect, and the full and uniform mixing of several components has guaranteed the homogeneity that synthon distribute in concrete, play best effect of anti-cracking.
For reaching satisfied anti-crack and anti-seepage effect, the volume of the present invention in concrete should be 6～12% of gelling material weight.
Concrete provided by the invention is simple with the production method of high cracking resistance, high impervious matrix material, cost is low.Compare obviously with existing concrete anticracking seepage control technique and to have the following advantages:
1. compare with the method for single admixture swelling agent or synthon, matrix material provided by the invention is the high cracking resistance water-tight concrete admixture that contains expansion component and synthon simultaneously, two kinds of components are from different aspects, make the most effective contribution to concrete cracking resistance in a different manner and in the different periods, complement one another, strengthen mutually, can make concrete have higher cracking resistance, impervious ability.
2. with at concrete mixing plant or working-yard swelling agent is compared with the anti-crack and anti-seepage technology that independent component adds respectively with synthon, matrix material provided by the invention since to the proportioning of two kinds of components through optimization design, can at utmost bring into play the collaborative synergistic effect of two kinds of materials, feed intake by the wind loosen collagen fibre simultaneously and two-stage is mixed and to be made that synthon and expansion component are full and uniform to be mixed, the uniform distribution of synthon in concrete be can guarantee, concrete cracking resistance, impervious ability improved.This product is as the selected starting material of factory, optimization cooperation, well-mixed single product, can avoid on the one hand the unstable of the different quality that cause in starting material source, avoid the indeterminate of when quality problems occurring responsibility simultaneously and cause shift responsibility onto others the phenomenon of disputing over trifles; Also can simplify concrete preparation technology greatly on the other hand.
3. compare with the anti-crack and anti-seepage technology that independent component adds respectively with synthon with single admixture swelling agent or swelling agent, the water-holding agent that is contained in the matrix material provided by the invention, can reduce the moisture evaporation of concrete itself, needed large quantity of moisture when guaranteeing concrete hydrating reduces concrete plasticity and dry shrinkage.
[description of drawings]
Fig. 1 is the synoptic diagram of benchmark mortar
Fig. 2 is the effect of prestressed figure of invention
Benchmark mortar shown in Figure 1 is not for mixing sand-cement slurry of the present invention, and Fig. 2 is for being mixed with 8% sand-cement slurry of the present invention.After pressing the air-dry 24h of CECS38:2004, do not mix the sand-cement slurry thin plate of high cracking resistance, high impervious matrix material, just occurred several minute cracks behind the air-dry 3h, crackle is constantly expanded afterwards, and the longest behind a 24h crack is about 40cm, the about 1.5mm of maximum width.And being mixed with 8% sand-cement slurry thin plate of the present invention, air-dry 24h does not see that crackle produces.
[embodiment]
The invention will be further described below in conjunction with embodiment.
Prepare following high cracking resistance, high impervious matrix material:
Embodiment 1:HEA swelling agent 90.0%, synthon 0%, water-holding agent 0%, naphthalenesulfonate formaldehyde condensation compound high efficiency water reducing agent 10.0%.
Embodiment 2:AEA swelling agent 97.0%, polypropylene fibre 3.0%, water-holding agent 0%, high efficiency water reducing agent 0%.
Embodiment 3:AEA swelling agent 91.5%, polypropylene fibre 1.5%, water-holding agent 0%, naphthalenesulfonate formaldehyde condensation compound high efficiency water reducing agent 8.0%.
Embodiment 4:UEA swelling agent 89.0%, polypropylene fibre 2.0%, TYLOSE 30000 2.0%, naphthalenesulfonate formaldehyde condensation compound high efficiency water reducing agent 8.0%.
Embodiment 5:AEA swelling agent 85.0%, polyacrylonitrile fibre 3.0%, Walocel MT 20.000PV ether 2.0%, naphthalenesulfonate formaldehyde condensation compound efficient retarding and water reducing agent 10%.
Embodiment 6: alumite plumping agent 83.5%, tynex 1.5%, xylon 4.0%, naphthalenesulfonate formaldehyde condensation compound efficient retarding and water reducing agent 10%.
Embodiment 7:UEA swelling agent 90.0%, polypropylene fibre 0.5%, TYLOSE 30000 1.0%, xylon 3.0%, polycarboxylate water-reducer 6.0%.
Embodiment 8:AEA swelling agent 80.0%, polypropylene fibre 1.5%, tynex 1.5%, Walocel MT 20.000PV ether 2.0%, xylon 3.0%, naphthalenesulfonate formaldehyde condensation compound efficient retarding and water reducing agent 12%.
Cooperate the back to drop into agravic mixer with above-mentioned with constituent metering (2 tons of total amounts), the gas blower that wherein various synthon wind speed are 10m/s is blown into.With agravic mixer mixing 6min (one-level mixing), again through helical ribbon agitator mixing 5min (secondary mixing).
Big volume dry powder matrix material mixed effect---fibre content standard deviation
Every kind of compound takes by weighing 10 parts of samples, every part of 200g, screen out meal with the 2.5mm square hole sieve after, take by weighing fibrous material quality in each part sample, with the deviation coefficient C of fibrous material content in 10 parts of samples
vThe dispersion effect of expression fiber.Deviation coefficient is more little, and effect is good more.The results are shown in Table 1.
The deviation coefficient Cv of table 1 fibrous material content
| Instance number | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Fibre content deviation coefficient C v | 0.025 | 0.024 | 0.022 | 0.028 | 0.028 | 0.024 | 0.026 |
Press table 2 proportioning preparation sand-cement slurry and concrete benchmark sample, wherein cement is P.O 42.5 class g cements, and the fineness modulus of yellow ground is 2.6, and stone is the basaltic broken stone of particle diameter 5～31.5mm, and water is civilian tap water.Replace the preparation of 8% cement with the impervious matrix material equivalent of aforementioned each example cracking resistance and inspected sample.
Table 2 mortar and concrete mix/weight part ratio
| Test specimen | Cement | Yellow ground | Stone | Water | Remarks |
| The mortar mortar concrete | 1.0 1.0 1.0 | 1.50 1.00 1.58 | 2.37 | 0.50 0.50 0.45 | The impervious test of cracking test water retention test |
Effect of prestressed---mortar crack reduces coefficient
With cement, anti-crack and anti-seepage additive, fineness modulus is that 2.6 yellow ground, the order of water stir each material adding cement plaster blender, presses the resistance to cleavage that CECS38:2004 measures sample, reduces coefficient η with the crack and characterizes.Crack reduces coefficient η and calculates by formula (1).The performance measurement calculation result of different anti-crack and anti-seepage additive sand-cement slurry sees Table 3.
Wherein: A
McrAnd A
FcrBe respectively and contrast with benchmark test specimen and the fissured nominal total area (mm of test specimen that adds anti-crack and anti-seepage additive concrete sample
2), calculate by formula (2)
In the formula: ω
I, max---i bar crack name maximum width, mm;
l
i---i bar crack name is long, mm.
Impervious effect---coagulation anti-permeability performance improves coefficient
" the impervious relatively test of concrete " of impervious test basis DL-T5150-2001 " concrete for hydraulic structure tentative specification " regulation carries out the impermeability of nine kinds of concrete when 0.8MPa hydraulic pressure.Test-results sees Table 3, and wherein anti-permeability performance raising FACTOR P r (%) presses following formula (3) calculating:
In the formula: H
1-normal concrete infiltration height, cm;
H
2-mix anti-crack and anti-seepage agent bleeding of concrete height, cm.
Water conservation effect---mortar water retention
Order by cement, anti-crack and anti-seepage additive, yellow ground, water stirs each material adding cement plaster blender, takes by weighing internal diameter 100mm, the circular die trial mass M of the clean metal of internal depth 25mm
1, 12 110mm * 110mm middling speed qualitative filter paper mass M
2Divide the metal test mould of packing into 10 times with mortar, and press while adding with spatula, when filling mortar a little more than the die trial edge, scrape off with the disposable mortar that die trial face is unnecessary of 45 with spatula, in the other direction mortar is wiped out at die trial face with more flat angle with spatula then.The erase mortar on die trial limit, weighing die trial and contain and carry a mortar weight M
3Cover the mortar face with two 110mm * 110mm medical yarn, on the cotton yarn face, put 12 filter paper again, on the filter paper face, with the 2kg weight sheet glass is pushed down again with the glass cover of two diameter 110mm; Static 2min removes sheet glass, takes out filter paper (not comprising cotton yarn), takes by weighing mass M
4Calculate water retention by formula (4),
In the formula:
W---water retention, %
M
1---dry die trial quality, g
M
2---12 filter paper preceding quality that do not absorb water, g
M
3---die trial and mortar gross weight, g
M
4---quality after 12 filter paper do not absorb water, g
α---mortar water ratio, %
Test-results sees Table 3.
The impervious matrix material additive effect of the different concrete anticrackings of table 3
| Sample | Effect of prestressed | Impervious effect | The water conservation effect | |
| The mortar crack reduces coefficient η/% | Bleeding of concrete height H/cm | Anti-permeability performance improves FACTOR P r/% | Mortar water retention W/% | |
| Benchmark sample example 1 example 2 examples 3 examples 4 examples 5 examples 6 examples 7 examples 8 | - 10.1 98.6 95.4 99.6 100 94.3 90.8 100 | 14.0 5.5 1.9 2.1 2.2 2.5 2.8 1.9 3.2 | - 60.7 86.4 85.0 88.3 82.1 80.0 86.4 77.1 | 82.2 86.4 83.6 92.3 94.2 93.1 98.4 97.1 97.3 |
Claims (11)
1. a concrete is characterized in that by following component formulated by weight: swelling agent 80～99%, synthon 0.5～4.0%, water-holding agent 0～4.0%, water reducer 0～12% with high cracking resistance, high impervious matrix material.
2. concrete is characterized in that with high cracking resistance, high impervious matrix material described swelling agent is the calcium sulphoaluminate class cement expansive material that satisfies the JC467-2001 standard-required according to claim 1.
As concrete as described in the claim 2 with high cracking resistance, high impervious matrix material, it is characterized in that the calcium sulphoaluminate class cement expansive material of stating clearly is selected from aluminite swelling agent, UEA swelling agent, AEA swelling agent or HEA swelling agent.
4. concrete is characterized in that with high cracking resistance, high impervious matrix material described synthon are selected from one or more assorted fibres by arbitrary proportion in polypropylene fibre, polyacrylonitrile fibre, the tynex according to claim 1.
5. concrete is characterized in that with high cracking resistance, high impervious matrix material described water-holding agent is selected from the composition of one or more arbitrary proportions of Walocel MT 20.000PV ether, TYLOSE 30000 or xylon according to claim 1.
6. concrete is characterized in that with high cracking resistance, high impervious matrix material described water reducer is solid high-efficiency water reducer or the solid efficient retarding and water reducing agent that satisfies the GB8076-1997 standard-required according to claim 1.
As concrete as described in the claim 6 with high cracking resistance, high impervious matrix material, it is characterized in that described water reducer is selected from naphthalenesulfonate formaldehyde condensation compound based water reducer or poly carboxylic acid series water reducer.
8. the described concrete of claim 1 to 7 is characterized in that described each component is mixed to the deviation coefficient of wherein synthon distribution less than 0.03 with the production method of high cracking resistance, high impervious matrix material.
9. as the production method of concrete as described in the claim 8 with high cracking resistance, high impervious matrix material, it is characterized in that the described secondary that is mixed into mixes, the first step is mixed with agravic mixer, and mix with helical ribbon agitator the second stage.
10. as the production method of concrete as described in claim 8 or 9, it is characterized in that feeding intake of synthon is blown in the agravic mixer by gas blower with high cracking resistance, high impervious matrix material.
11. as the production method of concrete as described in the claim 10 with high cracking resistance, high impervious matrix material, the wind speed that it is characterized in that gas blower is 5～15m/s.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805143A (en) * | 2010-03-12 | 2010-08-18 | 同济大学 | Anti-interference anticracking agent for concrete and preparation method thereof |
| CN102030492A (en) * | 2010-11-03 | 2011-04-27 | 金树青 | Anti-cracking agent for plastic shrinkage cracks of pumping concrete |
| CN104193216A (en) * | 2014-06-24 | 2014-12-10 | 济南大学 | Glucose high-polymer marine concrete anti-dispersion agent and preparation method thereof |
| CN105819733A (en) * | 2016-03-18 | 2016-08-03 | 南通不二环境科技有限公司 | Concrete anti-cracking and anti-permeability special additive and preparation method thereof |
| CN110240430A (en) * | 2019-06-14 | 2019-09-17 | 四川建蓉建材有限责任公司 | A kind of concrete swelling fiber anti-crack water-proof agent and preparation method thereof |
| CN113003977A (en) * | 2021-03-05 | 2021-06-22 | 南京派尼尔科技实业有限公司 | Composite internal curing shrinkage-reducing anti-cracking agent for concrete and production method thereof |
| CN117185731A (en) * | 2023-11-08 | 2023-12-08 | 邢台建工商品混凝土有限公司 | Preparation process of anti-cracking concrete |
| CN117178684A (en) * | 2023-08-22 | 2023-12-08 | 长安大学 | Preparation method of novel solidified soil terrace guard ridge in southern Shaanxi region |
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2007
- 2007-10-25 CN CN200710133923A patent/CN100582051C/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805143A (en) * | 2010-03-12 | 2010-08-18 | 同济大学 | Anti-interference anticracking agent for concrete and preparation method thereof |
| CN102030492A (en) * | 2010-11-03 | 2011-04-27 | 金树青 | Anti-cracking agent for plastic shrinkage cracks of pumping concrete |
| CN104193216A (en) * | 2014-06-24 | 2014-12-10 | 济南大学 | Glucose high-polymer marine concrete anti-dispersion agent and preparation method thereof |
| CN105819733A (en) * | 2016-03-18 | 2016-08-03 | 南通不二环境科技有限公司 | Concrete anti-cracking and anti-permeability special additive and preparation method thereof |
| CN105819733B (en) * | 2016-03-18 | 2017-03-08 | 南通不二环境科技有限公司 | Impervious additive of a kind of concrete anticracking and preparation method thereof |
| CN110240430A (en) * | 2019-06-14 | 2019-09-17 | 四川建蓉建材有限责任公司 | A kind of concrete swelling fiber anti-crack water-proof agent and preparation method thereof |
| CN110240430B (en) * | 2019-06-14 | 2021-10-22 | 四川建蓉建材有限责任公司 | Expansive fiber anti-cracking waterproof agent for concrete and preparation method thereof |
| CN113003977A (en) * | 2021-03-05 | 2021-06-22 | 南京派尼尔科技实业有限公司 | Composite internal curing shrinkage-reducing anti-cracking agent for concrete and production method thereof |
| CN117178684A (en) * | 2023-08-22 | 2023-12-08 | 长安大学 | Preparation method of novel solidified soil terrace guard ridge in southern Shaanxi region |
| CN117185731A (en) * | 2023-11-08 | 2023-12-08 | 邢台建工商品混凝土有限公司 | Preparation process of anti-cracking concrete |
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|---|---|
| CN100582051C (en) | 2010-01-20 |
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