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Preparation and application of a concrete anti-crack and anti-seepage composite additive

An additive and concrete technology, applied in the field of building materials, can solve the problems of limited use of fiber concrete, low tensile strength of synthetic fibers, and difficulty in achieving uniform dispersion, and achieve the effects of avoiding self-shrinkage cracking, improving toughness, and improving crack resistance.

Active Publication Date: 2022-04-15
江苏携砼新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of steel fiber and carbon fiber is expensive, the tensile strength of high elastic modulus synthetic fiber is low, and the fiber is easy to knot in concrete and it is difficult to achieve uniform dispersion, so the use of fiber concrete is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation and application of a new anti-cracking and anti-seepage composite additive for concrete. The components and their mass percentages are as follows:

[0020] 20 parts of white powdery sodium stearate; 30 parts of vinyl stearyl silicate; 5 parts of bentonite with a fineness of 0.8µm, of which the content of montmorillonite is greater than 87%; 20 parts of kaolin with a specific surface area of ​​470m 2 / kg; 5 parts of modified silica fume, the specific surface area is 550 m 2 / kg; 20 parts of modified polyester fibers with a length of 10 mm and a fiber diameter of 5 µm.

[0021] The preparation method of a novel concrete anti-crack and anti-seepage composite addition is as follows:

[0022] Send the measured sodium stearate, coupling agent, bentonite, kaolin, and modified silica fume into the mixer to pressurize at 0.5MPa, heat up to 45°C and mix, measure and distribute them into packaging bags as needed, and then add the required modified Measure and put the...

Embodiment 2

[0024] Preparation and application of a new anti-cracking and anti-seepage composite additive for concrete. The components and their mass percentages are as follows:

[0025] 30 parts of white powdery sodium stearate; 20 parts of vinyl stearyl silicate; 20 parts of bentonite, fineness of 0.8µm, of which montmorillonite content is greater than 87%; 10 parts of kaolin, specific surface area of ​​470m 2 / kg; 10 parts of modified silica fume, the specific surface area is 550 m 2 / kg; 10 parts of modified polyester fibers with a length of 10 mm and a fiber diameter of 5 µm.

[0026] The preparation method of a novel concrete anti-crack and anti-seepage composite addition is as follows:

[0027] Send the measured sodium stearate, coupling agent, bentonite, kaolin, and modified silica fume into the mixer to pressurize at 0.3MPa, heat up to 48°C and mix, measure and distribute them into packaging bags as needed, and then add the required modified Measure and put the permanent polyes...

Embodiment 3

[0029] Preparation and application of a new anti-cracking and anti-seepage composite additive for concrete. The components and their mass percentages are as follows:

[0030] 40 parts of white powdery sodium stearate; 20 parts of vinyl stearyl silicate; 10 parts of bentonite with a fineness of 0.8µm, of which the content of montmorillonite is greater than 87%; 5 parts of kaolin with a specific surface area of ​​470m 2 / kg; 15 parts of modified silica fume, the specific surface area is 550 m 2 / kg; 10 parts of modified polyester fiber with a length of 15mm and a fiber diameter of 10µm.

[0031] The preparation method of a novel concrete anti-crack and anti-seepage composite addition is as follows:

[0032] Send the measured sodium stearate, coupling agent, bentonite, kaolin, and modified silica fume into the mixer to pressurize at 0.1MPa, heat up to 55°C, and mix them. Measure and put the permanent polyester fiber into the powder bag that has been installed and seal it for la...

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Abstract

The invention discloses the preparation and application of a novel anti-crack and anti-seepage compound additive for concrete. Its main components are: sodium stearate, coupling agent, bentonite, kaolin, modified silica fume and modified polyester fiber. While improving the anti-cracking performance of concrete through sodium stearate, the introduction of silane coupling agent improves its impermeability. In addition, various mineral components can effectively adjust the hydration process of cement and improve the pore structure and mechanical properties of concrete. While improving the crack resistance of concrete, it also improves the impermeability of concrete. At the same time, the modified polyester fiber is used to improve the toughness of concrete, limit the expansion of concrete cracks under the action of external force, and effectively avoid shrinkage cracking and self-shrinkage cracking of concrete. The new anti-crack and anti-seepage composite additive of concrete has the characteristics of good economic performance, excellent performance and green environmental protection, which can bring significant economic and social benefits.

Description

technical field [0001] The invention belongs to the field of building materials and relates to a concrete additive, in particular to the preparation and application of a novel concrete anti-crack and anti-seepage composite additive. Background technique [0002] As the largest building material, concrete has excellent mechanical properties, durability and plasticity, and has been widely used in various construction projects, such as roads, bridges, tunnels, basements, pipelines, pools, water towers, etc. However, with the development of concrete structures towards high performance, the high shrinkage of concrete with low water-to-binder ratio leads to increasingly prominent problems of cracking and leakage of concrete. According to data statistics, the water seepage rate of urban buildings in my country is about 60%, and the leaky houses completed are as high as 37%, and the leakage maintenance cost of urban buildings is as high as 1.2 billion yuan per year. [0003] In ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B24/085C04B24/42C04B14/104C04B14/106C04B18/146C04B16/0683
Inventor 熊传胜陶卫荣范宏雷
Owner 江苏携砼新材料科技有限公司
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