CN113429180A - High-strength anti-crack concrete and preparation method thereof - Google Patents
High-strength anti-crack concrete and preparation method thereof Download PDFInfo
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- CN113429180A CN113429180A CN202110862409.4A CN202110862409A CN113429180A CN 113429180 A CN113429180 A CN 113429180A CN 202110862409 A CN202110862409 A CN 202110862409A CN 113429180 A CN113429180 A CN 113429180A
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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
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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
- 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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The application relates to the technical field of concrete, and particularly discloses high-strength anti-crack concrete and a preparation method thereof, wherein the high-strength anti-crack concrete is prepared from the following raw materials in parts by weight: 28-36 parts of portland cement, 9-13 parts of fly ash, 2.5-4 parts of silica fume, 29-33 parts of river sand, 55-75 parts of crushed stone, 0.2-0.7 part of a compound water reducing agent, 4-15 parts of an anti-cracking crystallizing agent, 7-9 parts of sodium monofluorophosphate and 25-27 parts of water. The high-strength anti-cracking concrete improves the anti-cracking performance and the overall strength of the concrete.
Description
Technical Field
The application relates to the field of concrete, in particular to high-strength anti-crack concrete and a preparation method thereof.
Background
Concrete refers to an engineering composite material formed by integrally cementing aggregates by a gel material. It is a non-homogeneous porous material made up by using cement as gel material and sand stone as aggregate, and mixing them with water according to a certain proportion, uniformly stirring them, tightly forming, curing and hardening.
Concrete is most commonly used in construction projects, however, after concrete pouring is completed, many quality problems often occur, such as weak strength, poor load capacity, breakage, slump and the like. In addition, concrete is also prone to shrinkage cracking during setting, resulting in irregular or through cracks.
The concrete is weak in strength and cracks due to various reasons: firstly, before the concrete is set, the cement is a hydraulic material and has contractility, and cracks are generated due to shrinkage caused by too fast surface water loss in the early hardening period; secondly, alkali ions are generated after the concrete is mixed, and the alkali ions and certain active aggregates generate chemical reaction and absorb water in the surrounding environment to increase, so that the concrete is expanded and cracked, and alkali aggregate reaction cracks are generated; and thirdly, the concrete is a non-homogeneous porous material, and a plurality of pores and capillaries are formed in the concrete, so that external moisture enters the concrete, the integral strength of the concrete is weakened, and cracking is caused.
Disclosure of Invention
In order to improve the strength and the crack resistance of concrete, the application provides high-strength crack-resistant concrete and a preparation method thereof.
In a first aspect, the present application provides a high-strength anti-crack concrete, which adopts the following technical scheme:
the high-strength anti-crack concrete is prepared from the following raw materials in parts by weight: 28-36 parts of portland cement, 9-13 parts of fly ash, 2.5-4 parts of silica fume, 29-33 parts of river sand, 55-75 parts of crushed stone, 0.2-0.7 part of a compound water reducing agent, 4-15 parts of an anti-cracking crystallizing agent, 7-9 parts of sodium monofluorophosphate and 25-27 parts of water.
By adopting the technical scheme, the compound water reducing agent, the anti-cracking crystallizing agent and the sodium monofluorophosphate are added into the high-strength anti-cracking concrete raw material. The addition of the compound water reducing agent can disperse the portland cement after the concrete mixture is added under the condition of keeping the slump of the concrete basically unchanged, improve the performance of the portland cement, improve the fluidity of the concrete mixture, reduce the unit water consumption, reduce cracks generated by excessive water loss and rapid shrinkage of the surface of the concrete at the initial hardening stage and play a certain role in cracking resistance. The addition of the anti-crack crystallizing agent can reduce the cracks caused by the pores and the capillaries in the concrete, and the anti-crack crystallizing agent can penetrate into the concrete, thereby generating complex reaction with calcium ions in the concrete to form an unstable complex which is easy to dissolve in water and can be replaced by more stable silicate and aluminate along with the diffusion of water in the concrete, generating crystallization and precipitation reaction to generate crystalline substances with certain strength, filling the crystalline substances into the cracks and the capillaries in the concrete, having a certain waterproof function, and preventing external moisture from entering the concrete through the capillaries and the pores in the concrete, thereby improving the strength of the concrete and simultaneously reducing the anti-crack performance of the concrete. The sodium monofluorophosphate added in the high-strength anti-cracking concrete raw material can form fluorine-containing mineral salt with mineral salts such as calcium, phosphorus and the like in river sand and broken stones, so that the acid corrosion resistance of the solidified concrete is enhanced, and the overall strength of the concrete is improved. In addition, the sodium monofluorophosphate has obvious functions of sterilizing and inhibiting the growth of microorganisms, thereby being beneficial to preventing the loosening and stripping of the concrete caused by the growth of fungi on the concrete and further improving the overall strength of the concrete.
Preferably, the method comprises the following steps: the composition is prepared from the following raw materials in parts by weight: 30-34 parts of portland cement, 10-12 parts of fly ash, 3-3.5 parts of silica fume, 30-32 parts of river sand, 60-70 parts of gravel, 0.4-0.6 part of compound water reducing agent, 7-12 parts of anti-cracking crystallizing agent, 7.5-8.5 parts of sodium monofluorophosphate and 25.5-26.5 parts of water.
Preferably, the method comprises the following steps: the compound water reducing agent is prepared from the following raw materials in parts by weight: 4-10 parts of polycarboxylic acid high-efficiency water reducing agent, 1-5 parts of gelatin, 0.05-0.1 part of sodium lignosulfonate, 5-9 parts of sodium gluconate and 3-13 parts of water.
By adopting the technical scheme, the polycarboxylic acid high-efficiency water reducing agent added in the raw materials of the compound water reducing agent contains polar groups with strong affinity with water, such as carboxyl, hydroxyl, amido, polyoxyalkyl and the like, and provides dispersion and flow properties for cement particles mainly through surface active effects of adsorption, dispersion, wetting, lubrication and the like; meanwhile, the polycarboxylic acid substances are adsorbed on the surfaces of the cement particles, and the cement particles are charged with negative charges due to carboxylate ions, so that electrostatic repulsion is generated among the silicate cement particles, the coagulation tendency of silicate cement paste can be inhibited, the contact area between the cement particles and water is increased, and the water mixing amount is reduced. The gelatin added in the raw materials of the compound water reducing agent is used as a protective colloid in the compound water reducing agent and is coated on the outer surface layer of the polycarboxylic acid high-efficiency water reducing agent, so that the decomposition heat of the polycarboxylic acid high-efficiency water reducing agent can be improved, and the water reducing rate of the compound water reducing agent can be greatly improved. After sodium lignosulfonate is added into the raw materials, bubbles can be generated by mixing and stirring, and the bubbles have a blocking effect, so that the evaporation route of free water in the concrete mixture is changed to be tortuous, fine, dispersed and closed, the characteristics and the quantity of capillary tubes are changed, and the water seepage passage of concrete is reduced. The sodium gluconate added in the raw materials of the compound water reducing agent is used as a retarder, so that the water reducing rate of the compound water reducing agent can be improved, the plastic product performance of the compound water reducing agent is improved, and the concrete rebound is improved.
Preferably, the method comprises the following steps: the weight ratio of the polycarboxylic acid high-efficiency water reducing agent to the gelatin is 1: (0.1-1).
Preferably, the method comprises the following steps: the anti-cracking crystallizing agent is prepared from the following raw materials in parts by weight: 0.5-1.5 parts of potassium bicarbonate, 1-3 parts of sodium methyl silicate, 0.5-2.5 parts of sodium citrate, 1-3 parts of calcium hydroxide, 0.5-1.5 parts of EDTA tetrasodium, 0.4-0.6 part of calcium formate and 6-13 parts of water.
By adopting the technical scheme, the potassium bicarbonate added into the anti-cracking crystallizing agent is used as a retarder of the anti-cracking crystallizing agent, so that the hydration reaction of cement can be delayed, the setting time of concrete is relatively prolonged, and the dispersibility of the compound water reducing agent is improved; the sodium methyl silicate is used as an auxiliary precipitator, so that crystals can block or cut off capillary pores, water seepage channels can be blocked, and capillary tubes and cracks in concrete can be blocked; sodium citrate is used as a complexing agent and performs a complexing reaction with calcium ions in the portland cement, so that crystals are generated; the calcium formate is used as a crystal growth agent, can promote the growth of crystals and is convenient for blocking capillaries and fine cracks in concrete; calcium hydroxide is used as a calcium ion supplement to supplement calcium ions which are lacked in concrete; the EDTA tetrasodium can promote the generation of calcium carbonate, and simultaneously can form a coordination compound with calcium ions in the portland cement to block cracks and capillaries in the concrete, reduce the generation of concrete cracks and improve the overall strength of the concrete.
Preferably, the method comprises the following steps: the anti-cracking crystallizing agent is prepared by the following method: adding the raw materials of the anti-cracking crystallization agent into water, fully stirring until the raw materials are dissolved, and uniformly mixing to obtain the anti-cracking crystallization agent.
Preferably, the method comprises the following steps: the weight ratio of the anti-cracking crystallizing agent to the portland cement is 1: (3-5).
By adopting the technical scheme, the anti-cracking crystallizing agent mainly performs a complexing reaction with calcium ions in the portland cement to generate a crystal complex, and the weight ratio of the anti-cracking crystallizing agent to the calcium ions can enable the generated crystal complex to correspond to the content of the portland cement, so that the crystals can conveniently block cracks and capillaries in the concrete, the cracking of the concrete is reduced, and the overall performance of the concrete is improved.
In a second aspect, the application provides a preparation method of any one of the above high-strength anti-crack concrete, which is specifically realized by the following technical scheme:
a preparation method of high-strength anti-crack concrete comprises the following operation steps:
uniformly mixing portland cement, river sand, broken stone, fly ash, sodium monofluorophosphate and silica fume, grinding and sieving by a 200-mesh sieve to obtain a mixed dry material;
adding a compound water reducing agent and water into the mixed dry material, and uniformly stirring to obtain a mixture A;
and adding an anti-cracking crystallizing agent into the mixture A, and uniformly stirring to obtain the high-strength anti-cracking concrete.
By adopting the technical scheme, the portland cement, the river sand, the gravel, the fly ash, the sodium monofluorophosphate and the silica fume are uniformly mixed and ground, and are sieved by a 200-mesh sieve, so that the concrete is stirred more uniformly; the anti-cracking crystallizing agent and the compound water reducing agent are dissolved in water and mixed with other raw materials of the concrete, so that the raw materials of the anti-cracking crystallizing agent and the compound water reducing agent are fully dissolved, the water reducing and anti-cracking performance of the compound water reducing agent and the anti-cracking crystallizing agent is improved, and the concrete is prevented from cracking while the integral strength of the concrete is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
(1) the indexes of the high-strength anti-cracking concrete such as the compressive strength, the splitting tensile strength, the breaking strength and the water absorption rate are all superior to those of a comparative example, the high-strength anti-cracking concrete has excellent performance, the highest compressive strength can reach 89.5MPa, the highest splitting tensile strength is 6MPa, the breaking strength is 8.5MPa, the high-strength anti-cracking concrete has high strength, the lowest water absorption rate is 1.5%, and the high-strength anti-cracking concrete has good anti-seepage and anti-cracking performance.
(2) The high-strength anti-cracking concrete has the functions of improving the strength of the concrete and resisting cracking, and can also have higher waterproof performance.
Detailed Description
The present application will be described in further detail with reference to specific examples.
The following raw materials in the application are all commercially available products, and specifically: the Portland cement is selected from Sanhe Dingxuan-Sansheng Shang trade company Limited; the fly ash is selected from Shijiazhuang Lin mineral products, Inc.; the silica fume is selected from tourmaline mineral products, Inc., and has a particle size of 200 meshes; the river sand is selected from Shijiazhuangyitai science and technology limited, and the particle size is 70-100 meshes; the macadam is selected from Yixian county Wanyuan Industrial and trade building materials sales Co Ltd; the sodium monofluorophosphate is selected from Jinan Hui Chuan chemical industry Co., Ltd, and the content of effective substances is 99%; the polycarboxylic acid high-efficiency water reducing agent is selected from chemical technology limited company of Jinyin province, and the content of effective substances is 99 percent; the sodium gluconate is selected from Changzhou Yaosheng environmental protection science and technology limited company, and the content of effective substances is 98 percent; the tetrasodium EDTA is selected from environmental protection science and technology limited of Yaosheng, Heizhou, with 99% of effective substance; the sodium citrate is selected from environmental protection technologies, Inc. of Yaosheng, Changzhou; the sodium methyl silicate is selected from the chemical industry of Jinan hong Cheng Gai Co Ltd; the calcium hydroxide is selected from Liaoning Xin Fei Ca Co Ltd, and the content of effective substances is 92%; the potassium bicarbonate is selected from Wuhanji industry promotion chemical company Limited, and the content of effective substances is 99 percent; the calcium formate is selected from Shanxi European standard industry Co Ltd; the gelatin is selected from Jinan Hui Chuan chemical company; the sodium lignosulfonate is selected from ShangHu commercial and trade company, Jinan Hui Chuan.
The following are preparation examples of the compound water reducing agent in the application:
preparation example 1
The compound water reducing agent in the application is prepared by the following specific steps:
1. adding a polycarboxylic acid high-efficiency water reducing agent and gelatin into water according to the mixing amount shown in the table 1, and stirring to dissolve the polycarboxylic acid high-efficiency water reducing agent and the gelatin to obtain a mixture A; 2. and adding sodium lignosulfonate and sodium gluconate into the mixture A, and uniformly stirring to obtain the compound water reducing agent.
Preparation examples 2 to 3
The compound water reducing agent of the preparation examples 2 to 3 has the same preparation method as that of the preparation example 1, and the difference is that the raw materials are different in components, and the details are shown in table 1.
TABLE 1 blending amounts (unit: g) of respective raw materials of the compounded water reducing agents of preparation examples 1 to 3
| Raw materials | Preparation example 1 | Preparation example 2 | Preparation example 3 |
| Polycarboxylic acid high-efficiency water reducing agent | 400 | 700 | 1000 |
| Gelatin | 100 | 200 | 400 |
| Lignosulfonic acid sodium salt | 5 | 7 | 10 |
| Sodium gluconate | 500 | 700 | 900 |
| Water (W) | 300 | 800 | 1300 |
Preparation examples 4 to 6
The compound water reducing agents of preparation examples 4 to 6 have the same preparation method as that of preparation example 1, except that the raw materials are different in components, and are specifically shown in table 2.
TABLE 2 blending amounts (unit: g) of respective raw materials of the compounded water reducing agents of preparation examples 4 to 6
The following are examples of the preparation of the anti-crack crystallization agent in the present application:
preparation example 7
The preparation operation of the anti-cracking crystallizing agent in the application is as follows:
according to the mixing amount shown in the table 3, potassium bicarbonate, sodium methyl silicate, sodium citrate, calcium hydroxide, tetrasodium EDTA and calcium formate in the anti-cracking crystallization agent raw materials are added into water and fully stirred until dissolved, and the anti-cracking crystallization agent is obtained by uniformly mixing.
Preparation examples 8 to 9
The anti-cracking agents of preparation examples 8 to 9 were prepared in the same manner as in preparation example 7, except that the amounts of the respective raw materials were different, and the details are shown in table 3.
TABLE 3 blending amounts (unit: g) of respective materials for the anti-cracking agents of preparation examples 7 to 9
| Raw materials | Preparation example 7 | Preparation example 8 | Preparation example 9 |
| Potassium bicarbonate | 50 | 100 | 150 |
| Sodium methyl silicate | 100 | 200 | 300 |
| Citric acid sodium salt | 50 | 150 | 250 |
| Calcium hydroxide | 100 | 200 | 300 |
| Tetrasodium EDTA | 50 | 100 | 150 |
| Calcium formate | 40 | 50 | 60 |
| Water (W) | 600 | 900 | 1300 |
Example 1
The high-strength anti-crack concrete is prepared by the following operation steps:
according to the mixing amount shown in the table 3, uniformly mixing portland cement, river sand, gravel, fly ash, sodium monofluorophosphate and silica fume, and grinding and sieving by a 200-mesh sieve to obtain a mixed dry material;
adding the compound water reducing agent prepared in the preparation example 1 and water in corresponding parts by weight into the mixed dry material, and uniformly stirring to obtain a mixture A;
and adding the anti-crack crystallizing agent prepared in the preparation example 7 in a corresponding weight part into the mixture A, and uniformly stirring to obtain the high-strength anti-crack concrete.
Examples 2 to 5
The preparation methods and the types of the raw materials of the high-strength anti-cracking concrete of the embodiments 2 to 5 are completely the same as those of the embodiment 1, except that the mixing amounts of the raw materials are different, and the details are shown in table 4.
TABLE 4 blending amounts (unit: kg) of respective raw materials of the high strength anti-cracking concretes of examples 1 to 5
| Raw materials | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Portland cement | 28 | 30 | 32 | 34 | 36 |
| Fly ash | 9 | 10 | 11 | 12 | 13 |
| Silica fume | 2.5 | 3 | 3.3 | 3.5 | 4 |
| River sand | 29 | 30 | 31 | 32 | 33 |
| Crushing stone | 55 | 60 | 65 | 70 | 75 |
| Compound water reducing agent | 0.2 | 0.4 | 0.5 | 0.6 | 0.7 |
| Anti-cracking crystallizing agent | 4 | 7 | 10 | 12 | 15 |
| Sodium monofluorophosphate | 7 | 7.5 | 8 | 8.5 | 9 |
| Water (W) | 25 | 25.5 | 26 | 26.5 | 27 |
Examples 6 to 8
The preparation methods and the types of the raw materials of the high-strength anti-cracking concretes of the embodiments 6 to 8 are completely the same as those of the embodiment 3, except that the mixing amounts of the raw materials are different, and the details are shown in table 5.
TABLE 5 blending amounts (unit: kg) of respective raw materials of the high strength anti-cracking concretes of examples 6 to 8
| Raw materials | Example 6 | Example 7 | Example 8 |
| Portland cement | 32 | 32 | 32 |
| Fly ash | 11 | 11 | 11 |
| Silica fume | 3.3 | 3.3 | 3.3 |
| River sand | 31 | 31 | 31 |
| Crushing stone | 65 | 65 | 65 |
| Compound water reducing agent | 0.5 | 0.5 | 0.5 |
| Anti-cracking crystallizing agent | 10.7 | 8 | 6.4 |
| Sodium monofluorophosphate | 8 | 8 | 8 |
| Water (W) | 25 | 26 | 27 |
Examples 9 to 13
The high-strength anti-cracking concrete of the embodiments 9 to 13 has the same preparation method as that of the embodiment 7, except that the compound water reducing agents prepared in the preparation embodiments 2 to 6 are respectively selected as the compound water reducing agents.
Examples 14 to 15
The high-strength anti-crack concretes of examples 14 to 15 were prepared in the same manner as in example 11, except that the anti-crack crystallizers of preparation examples 8 to 9 were used as the anti-crack crystallizers, respectively.
Comparative example 1
The high-strength anti-crack concrete of comparative example 1 is prepared in the same manner as in example 1 except that: only the polycarboxylic acid high-efficiency water reducing agent is added into the raw materials of the compound water reducing agent, and the rest raw materials and the mixing amount are the same as those in the example 1.
Comparative example 2
The high-strength anti-crack concrete of the comparative example 2 is completely the same as the raw material type and the mixing amount of the concrete of the example 1, and the difference is that: in the preparation method, portland cement, river sand, crushed stone, fly ash, sodium monofluorophosphate and silica fume were uniformly stirred without grinding, and the rest of the preparation operation was the same as that of example 1.
Comparative example 3
The high-strength crack-resistant concrete of comparative example 3 was prepared in exactly the same manner as in example 1, except that: sodium monofluorophosphate is not added in the raw materials of the high-strength anti-cracking concrete, and the other raw materials and the mixing amount are the same as those in the embodiment 1.
Comparative example 4
The high-strength crack-resistant concrete of comparative example 4 was prepared in exactly the same manner as in example 1, except that: the compound water reducing agent is not added, and the other raw materials and the mixing amount are the same as those in the example 1.
Comparative example 5
The high-strength crack-resistant concrete of comparative example 5 was prepared in exactly the same manner as in example 1, except that: the raw materials and the mixing amount are the same as those in example 1 without adding an anti-cracking crystallization agent.
Comparative example 6
The high-strength crack-resistant concrete of comparative example 6 was prepared in exactly the same manner as in example 1, except that: the gelatin in the raw materials of the compound water reducing agent is replaced by the same amount of water, and the other raw materials and the mixing amount are the same as those in the embodiment 1.
Comparative example 7
The high-strength crack-resistant concrete of comparative example 7 was prepared in exactly the same manner as in example 1, except that: the sodium lignin sulfonate in the raw materials of the compound water reducing agent is replaced by equivalent water, and the other raw materials and the mixing amount are the same as those in the embodiment 1.
Comparative example 8
The high-strength crack-resistant concrete of comparative example 8 was prepared in exactly the same manner as in example 1, except that: the calcium formate in the raw materials of the anti-cracking agent is replaced by the same amount of water, and the other raw materials and the mixing amount are the same as those in the example 1.
Comparative example 9
The high-strength crack-resistant concrete of comparative example 9 was prepared in exactly the same manner as in example 1, except that: the potassium bicarbonate in the anti-cracking crystallization agent raw material is replaced by the same amount of water, and the other raw materials and the mixing amount are the same as those in the example 1.
Performance detection
Standard test blocks are respectively made on the high-strength anti-cracking concrete of examples 1-15 and comparative examples 1-9 by adopting a detection method and a standard of GB/T50081-2016 standard of mechanical property test method of common concrete, and the compression strength performance test, the splitting tensile strength and the breaking strength are carried out when each standard test block is used for 28d, and the test results are shown in Table 6.
By adopting the detection method and the standard of DB32/T3696-2019 appendix F concrete water absorption test method, standard test blocks of 150mm multiplied by 150mm are respectively made on the high-strength anti-crack concretes of examples 1-15 and comparative examples 1-9, 3 blocks of each group are drilled, concrete core samples with the diameter of 75mm are drilled, the upper and lower surfaces are cut off, cylindrical core samples with the height of 75mm are prepared, the cylindrical core samples are weighed by drying, cooling, soaking and surface water wiping, and the average water absorption rate (%) of the examples 1-15 and the comparative examples 1-9 is calculated, and the test results are shown in Table 6.
TABLE 6 Performance test results for different high-strength anti-crack concretes
The test results in Table 4 show that the compressive properties, the cleavage tensile strength, the breaking strength and the water absorption of the high-strength anti-cracking concretes of examples 1 to 15 are superior to those of the high-strength anti-cracking concretes of comparative examples 1 to 9. Therefore, the high-strength anti-cracking concrete effectively improves the compressive strength, the breaking strength and the splitting tensile strength of the concrete, and simultaneously improves the anti-seepage capability of the concrete.
In examples 1 to 5, the compressive property, the splitting tensile strength and the breaking strength of the high-strength anti-cracking concrete in example 3 were respectively 79MPa, 5MPa and 7.5MPa, which were higher than those in examples 1 to 2 and examples 4 to 5; meanwhile, the water absorption of the high-strength anti-cracking concrete in the embodiment 3 is 3 percent and is lower than that of the embodiments 1-2 and 4-5. The weight parts of the raw materials of the high-strength anti-crack concrete in example 3 are more suitable.
The various performances of the high-strength anti-cracking concrete of the examples 6 to 8 are all superior to those of the examples 1 to 5, and in the examples 6 to 8, the compressive performance, the splitting tensile strength and the breaking strength of the high-strength anti-cracking concrete of the example 7 are respectively 79.5MPa, 5.3MPa and 7.8MPa, which are all higher than those of the high-strength anti-cracking concrete of the examples 6 and 8, and the water absorption of the high-strength anti-cracking concrete of the example 7 is 2.5% and lower than those of the high-strength anti-cracking concrete of the examples 6 and 8, so that the most suitable weight part ratio of the anti-cracking crystallization agent to the silicate cement in the raw material of the high-strength anti-cracking concrete is 1: 4.
The various performances of the high-strength anti-cracking concrete of the examples 9 to 13 are all superior to those of the examples 6 to 8, and in the examples 9 to 13, the compressive performance, the splitting tensile strength and the breaking strength of the high-strength anti-cracking concrete of the example 12 are respectively 85MPa, 5.8MPa and 8.3MPa, which are all higher than those of the high-strength anti-cracking concrete of the examples 9 to 11 and 13, and the water absorption of the high-strength anti-cracking concrete of the example 12 is 2% and lower than those of the high-strength anti-cracking concrete of the examples 9 to 11 and 12, so that the weight part ratio of the polycarboxylic acid high-efficiency water reducing agent to the gelatin in the raw material of the high-strength anti-cracking concrete is 1: 0.5. In example 11 and examples 14 to 15, the performances of example 14 are all better than those of example 11 and example 15, which shows that the raw material proportion of the anti-cracking crystallizing agent in the high-strength anti-cracking concrete of example 14 is most suitable and the effect is optimal.
In addition, according to various index data of comparative examples 1-15 and comparative examples 1-9, the gelatin and sodium lignosulfonate added in the raw materials of the added compound water reducing agent and the compound water reducing agent are adopted to obviously improve the compressive strength, the splitting tensile strength and the breaking strength of the high-strength anti-cracking concrete, and the water absorption of the high-strength anti-cracking concrete is relatively reduced due to the improvement of the strength. The sodium monofluorophosphate and the macadam added in the raw materials of the high-strength anti-cracking concrete relatively improve various performances of the high-strength anti-cracking concrete, and the potassium bicarbonate and the calcium formate selected from the raw materials of the anti-cracking crystallizing agent have obvious effects in the aspects of strength and anti-cracking. As can be seen from the data of comparative example 6, the water absorption of the high-strength anti-crack concrete without the anti-crack crystallization agent is 16% and is obviously higher than that of the concrete in examples 1 to 15. Compared with comparative examples 1-9, the water absorption of examples 1-15 is significantly reduced, which shows that the crack resistant crystallization agent added in the application plays a better role in preventing permeation and cracking in concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The high-strength anti-crack concrete is characterized by being prepared from the following raw materials in parts by weight: 28-36 parts of portland cement, 9-13 parts of fly ash, 2.5-4 parts of silica fume, 29-33 parts of river sand, 55-75 parts of crushed stone, 0.2-0.7 part of a compound water reducing agent, 4-15 parts of an anti-cracking crystallizing agent, 7-9 parts of sodium monofluorophosphate and 25-27 parts of water.
2. The high-strength anti-crack concrete according to claim 1, which is prepared from the following raw materials in parts by weight: 30-34 parts of portland cement, 10-12 parts of fly ash, 3-3.5 parts of silica fume, 30-32 parts of river sand, 60-70 parts of gravel, 0.4-0.6 part of compound water reducing agent, 7-12 parts of anti-cracking crystallizing agent, 7.5-8.5 parts of sodium monofluorophosphate and 25.5-26.5 parts of water.
3. The high-strength anti-crack concrete according to claim 1, wherein the compound water reducing agent is prepared from the following raw materials in parts by weight: 4-10 parts of polycarboxylic acid high-efficiency water reducing agent, 1-5 parts of gelatin, 0.05-0.1 part of sodium lignosulfonate, 5-9 parts of sodium gluconate and 3-13 parts of water.
4. The high strength, crack resistant concrete according to claim 3, wherein: the weight ratio of the polycarboxylic acid high-efficiency water reducing agent to the gelatin is 1: (0.1-1).
5. The high-strength anti-crack concrete according to claim 1, wherein the anti-crack crystallizing agent is prepared from the following raw materials in parts by weight: 0.5-1.5 parts of potassium bicarbonate, 1-3 parts of sodium methyl silicate, 0.5-2.5 parts of sodium citrate, 1-3 parts of calcium hydroxide, 0.5-1.5 parts of EDTA tetrasodium, 0.4-0.6 part of calcium formate and 6-13 parts of water.
6. The high strength anti-crack concrete according to claim 5, wherein the anti-crack crystallizing agent is prepared by the following method: adding the raw materials of the anti-cracking crystallization agent into water, fully stirring until the raw materials are dissolved, and uniformly mixing to obtain the anti-cracking crystallization agent.
7. The high strength, crack resistant concrete according to claim 1, wherein: the weight ratio of the anti-cracking crystallizing agent to the portland cement is 1: (3-5).
8. A method for preparing the high-strength anti-crack concrete according to any one of claims 1 to 7, characterized by comprising the following steps:
uniformly mixing portland cement, river sand, broken stone, fly ash, sodium monofluorophosphate and silica fume, grinding and sieving by a 200-mesh sieve to obtain a mixed dry material;
adding a compound water reducing agent and water into the mixed dry material, and uniformly stirring to obtain a mixture A;
and adding an anti-cracking crystallizing agent into the mixture A, and uniformly stirring to obtain the high-strength anti-cracking concrete.
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