A kind of interface reinforced lightweight concrete and its preparation method

A light-weight concrete and interface-enhanced technology, applied in the field of interface-enhanced lightweight concrete and its preparation, can solve the problems of restricting the application and promotion of EPS concrete, increasing the price of EPS concrete, and weak interface bonding force of cement paste, etc., to meet the requirements of Construction quality requirements, improved bonding strength, and good bonding performance

Active Publication Date: 2019-11-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, EPS particles have two major weaknesses. One is that they are very light and are prone to segregation during the concrete mixing process. The other is that they are hydrophobic and have weak interface bonding with cement paste. These two defects have seriously restricted the development of EPS concrete technology. Application and Promotion
[0003] In the existing research reports, most of the high-cost interface additives are used, such as epoxy resin or water-soluble ethylene propionate, which greatly increases the price of EPS concrete; low range, which greatly limits its application

Method used

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  • A kind of interface reinforced lightweight concrete and its preparation method
  • A kind of interface reinforced lightweight concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An interface reinforced lightweight concrete, which consists of the following components in parts by weight: 150 parts of cement, 43 parts of water, 0.4 parts of water reducing agent, 0.1 part of cellulose ether, silicone emulsion coupling modified expanded polystyrene (Modified EPS) 12 parts.

[0023] The preparation method of the above interface reinforced lightweight concrete, the specific steps are as follows:

[0024] 1. Preparation of silicone emulsion: silicone emulsion is an emulsion obtained by mixing and copolymerizing neutral silica sol aqueous solution, allyl polyether, allyl siloxane, and butyl methacrylate. The specific preparation process is as follows: neutral silicon Sol aqueous solution, allyl polyether aqueous solution, allyl siloxane aqueous solution, and pure butyl methacrylate are mixed in a volume ratio of 1:0.05:0.05:1, and a blend is obtained after ultrasonic dispersion; then, to the blend Add 0.1g / L hydrogen peroxide and 10% polyvinyl alcohol ...

Embodiment 2-10

[0030] The components in Examples 2-10 are shown in Table 1 in parts by weight, and the specific raw materials and preparation methods are the same as those in Example 1.

[0031] Table 1

[0032]

[0033]

[0034] The bulk density of interface reinforced lightweight concrete prepared in Example 2-10 is 800-1200kg / m 3 , 7d strength up to 10-20MPa. Among them, the water content should not be too little. A proper amount of water is beneficial to concrete forming and has a certain influence on the concrete strength. The more water is added, the lower the concrete strength is, preferably 35-45 parts.

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Abstract

The invention relates to the field of light concrete materials and in particular to interface reinforced light concrete. The interface reinforced light concrete is prepared from the following raw materials in parts by weight: 147-150 parts of cement, 25-50 parts of water, 0.2-0.7 part of a water reducer, 0.1-0.7 part of cellulose ether and 6-12 parts of organosilicone emulsion coupled and modified expandable polystyrene (modified EPS). According to the interface reinforced light concrete provided by the invention, by adding the granularly graded modified EPS, the filling arte of the modified EPS and the specific surface area of the modified EPS granules in a cement matrix can be increased. The adhesive strength of the coupled EPS and the cement slurry is improved, so that the weight of the concrete is greatly alleviated and the two are tightly combined; the cellulose ether is added, so that the slurry viscosity is increased; the EPS granules are unlikely to float upward and are more uniformly distributed.

Description

technical field [0001] The invention relates to an interface reinforced lightweight concrete and a preparation method thereof. Background technique [0002] Expandable Polystyrene foam (Expandable PolyStyrene, EPS) is a lightweight foam with a closed-cell structure inside. Mixing EPS foam particles into mortar or concrete can prepare lightweight concrete with different apparent densities. In recent years, with the continuous emergence of high-rise buildings, the demand for lightweight high-strength concrete is increasing. EPS lightweight concrete has the characteristics of high density and light weight, so it has become more and more widely used in building construction. However, EPS particles have two major weaknesses. One is that they are very light and are prone to segregation during the concrete mixing process. The other is that they are hydrophobic and have weak interface bonding with cement paste. These two defects have seriously restricted the development of EPS conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/10C04B111/40
CPCC04B20/1051C04B28/04C04B2111/40C04B2201/20C04B2201/50C04B24/24C04B24/383C04B16/08
Inventor 黄健张文长陈跳蹇守卫马保国
Owner WUHAN UNIV OF TECH
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