Composite modifier and low-strength concrete prepared from same

A compound modifier and concrete technology, which is applied in the field of building materials, can solve problems affecting the service life and driving safety of subgrade engineering structures or foundation treatment engineering, degradation of service performance, microstructure changes, etc., to achieve superior performance and improve performance , long service life effect

Pending Publication Date: 2019-10-25
GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although the above-mentioned modifiers can optimize the composition of hydration products of cement stone in concrete, and introduce tiny closed pores into concrete to improve its pore structure, they are effective in resisting environmental water erosion, especially in high-humidity environments. It is difficult to work, and it will still be eroded by environmental water for a long time, causing composition, microstructure changes and deterioration of service performance, seriously affecting the service life and driving safety of roadbed engineering structures or foundation treatment projects

Method used

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  • Composite modifier and low-strength concrete prepared from same
  • Composite modifier and low-strength concrete prepared from same
  • Composite modifier and low-strength concrete prepared from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see figure 1 , a composite modifier, the composite modifier is composed of the following components by weight: 60 parts of low-calcium fly ash, 0.1 part of air-entraining agent, 1 part of high-efficiency water reducer, 1 part of retarder, 3 parts Surfactant, 1 part of dispersant, 0.5 part of thickener, 10 parts of hollow mesoporous silica microspheres, 20 parts of hydrophobic perlite, 2 parts of nano-alumina, 10 parts of superhydrophobic microcapsules.

[0042] Nano-alumina has a small particle size and a large specific surface area, while hollow mesoporous silica microspheres have a high specific surface area and good dispersion. Its unique hollow cavity and mesoporous shell characteristics can be well Adsorption aids, while enhancing the interfacial adhesion between the composite modifier and concrete, which is conducive to stress transfer and improves the strength and stability of concrete.

[0043] Low-calcium fly ash is Class I or Class II low-calcium fly ash, or ...

Embodiment 2

[0051] see figure 1 , a composite modifier, the composite modifier is composed of the following components by weight: 80 parts of low-calcium fly ash, 0.2 parts of air-entraining agent, 5 parts of high-efficiency water reducer, 10 parts of retarder, 10 parts Surfactant, 5 parts of dispersant, 1 part of thickener, 20 parts of hollow mesoporous silica microspheres, 40 parts of hydrophobic perlite, 5 parts of nano-alumina, and 15 parts of superhydrophobic microcapsules.

[0052] Low-calcium fly ash is Class I or Class II low-calcium fly ash, or a mixture of Class I and Class II low-calcium fly ash, and the mixing ratio is 1:1.5. Low-calcium fly ash can dilute silicate The content of C3A minerals in cement that is sensitive to environmental water erosion can also react with Ca(OH)2 formed by cement hydration to produce pozzolanic reactions, increasing the relatively stable and low calcium-silicon hydrated silicon hydrate under environmental water erosion Calcium acid C-S-H conten...

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Abstract

The invention discloses a composite modifier and low-strength concrete prepared from same and belongs to the technical field of building materials. The composite modifier consists of the following components: a low-calcium powder coal ash air entraining agent, a superplasticizer, a retarder, a surfactant, a dispersing agent, a thickening agent, hollow mesoporous silica microspheres, hydrophobic perlite, nano aluminum oxide and super-hydrophobic microcapsules. Modification of the low-strength concrete with the composite modifier can be achieved, and due to adoption of dual modes of dense waterresistance and surface hydrophobicity, a remarkable corrosion resistance function can be achieved for environment water, meanwhile, a conventional stirring mode is replaced by using a uniform mixing device, the composite modifier is uniformly filled into concrete, then the concrete can be sufficiently modified, properties of the low-strength concrete can be improved, and according to practical construction requirements of a construction site, an external magnetic field is applied to orient the super-hydrophobic microcapsules, and the super-hydrophobic microcapsules can be distributed on a surface to implement release and water resistance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a composite modifier and low-strength concrete prepared therefrom. Background technique [0002] During the construction of railways and highways, there are a large number of subgrade projects and foundation treatment projects, such as concrete (or chip concrete) supports that are often used to protect the slope surface from erosion by external factors or prevent disasters caused by slope collapse. Structure, cement fly ash gravel (CFG) pile foundation used to improve the bearing capacity of the foundation, etc. These projects can meet the requirements by using low-strength concrete materials. For example, the gravity retaining wall is a retaining structure that relies on the self-weight of the wall to resist the earth pressure and prevent the soil from slumping. The size of the section is mainly affected by the overall sliding of the wall. , overturning, base eccentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B26/28C04B111/20C04B111/27
CPCC04B26/285C04B40/0039C04B2111/20C04B2111/27C04B18/08C04B14/06C04B14/18C04B14/303C04B2103/302C04B2103/22C04B24/18C04B24/16C04B24/383C04B24/04C04B24/20C04B24/42C04B22/062C04B22/06C04B22/142C04B2103/0068C04B18/248C04B14/02C04B20/008C04B20/0008
Inventor 卢伟雄肖山虎蔡健
Owner GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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