Modified calcium oxide expansive agent used for cement concrete and preparation method thereof

A technology of cement concrete and calcium oxide, applied in the field of building materials, can solve the problems of easy moisture absorption failure, hydration waste, etc.

Active Publication Date: 2015-06-03
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a modified calcium oxide cement concrete expansive agent and its preparation method in view of the technical problems that the calcium oxide expansive agent is easy to absorb moisture and fail, and the hydration is wasted in the plastic stage of cement concrete.

Method used

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  • Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
  • Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
  • Modified calcium oxide expansive agent used for cement concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh calcium oxide-based expansion clinker and redispersible latex powder with a mass ratio of 999:1, mix them and place them in an electromagnetic vibrating mill for grinding for 0.1 min to obtain the modified calcium oxide-based cement concrete expansion agent 1 .

Embodiment 2

[0044] The calcium oxide-based expansive clinker and redispersible latex powder with a mass ratio of 99:1 were weighed, mixed evenly and placed in an electromagnetic vibrating mill for grinding for 2 minutes to obtain the modified calcium oxide-based cement concrete expansion agent 2.

Embodiment 3

[0046] Weigh calcium oxide-based expansive clinker and redispersible latex powder with a mass ratio of 995:5, mix them and place them in a continuous powder surface modification machine for grinding for 3 minutes to obtain the modified calcium oxide-based cement concrete expansion Agent 3.

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Abstract

The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The specific surface area of the modified calcium oxide expansive agent used for cement concrete is 100-600m<2> / kg and is prepared by coating a calcium oxide expanding clinker with redispersible latex powder, wherein the redispersible latex powder accounts for 0.1-10% of the total modified calcium oxide expansive agent used for cement concrete by mass. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the humidity resistance of the modified calcium oxide expansive agent used for cement concrete is improved, invalid hydration at the plastic stage of cement concrete is reduced and the expansion quantity is increased after concrete is hardened, thus improving the concrete cracking resistance of the calcium oxide expansive agent.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a modified calcium oxide cement concrete expansion agent and a preparation method thereof. technical background [0002] Cement concrete is the most used building material in the world. Due to its own material characteristics and construction reasons, cement concrete has shrinkage problems such as chemical shrinkage, drying shrinkage, and temperature shrinkage. Shrinkage can easily lead to cracking. [0003] With the improvement of modern engineering quality requirements, the strength requirements of cement concrete are getting higher and higher, and cement concrete is developing towards high performance. With the use of various high-performance admixtures, the water-to-binder ratio of cement concrete is getting lower and lower. While greatly improving the strength level of concrete, it also further increases the risk of concrete cracking. [0004] In order to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24
Inventor 王瑞李磊田倩王洪松张守治程俊王育江
Owner JIANGSU SOBUTE NEW MATERIALS
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