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Anti-cracking additive for concrete

A technology for concrete and admixtures, applied in the field of concrete admixtures, can solve problems such as concentrated heat release during cement hydration, and achieve the effects of reduced heat release, low cost, and simple preparation process

Active Publication Date: 2015-05-06
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above two types of compounds mainly prolong the induction period of cement hydration, but have little effect on the acceleration period and deceleration period, so they cannot solve the problem of concentrated heat release of cement hydration

Method used

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  • Anti-cracking additive for concrete
  • Anti-cracking additive for concrete
  • Anti-cracking additive for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 100g of polyacrylic acid with a degree of polymerization of 146, 8g of glucose, and 1g of p-toluenesulfonic acid were added to 500ml of toluene, and the temperature was raised to 130°C for 15 hours. During this period, the generated water was separated by a water separator, which was beneficial to improve the degree of esterification. After the reaction, the liquid was precipitated in ether, filtered and dried to obtain the desired product.

Embodiment 2

[0041] Except that the glucose quality is 27g, others are the same as Example 1.

Embodiment 3

[0043]Except that the glucose quality is 45g, others are the same as Example 1.

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Abstract

The invention provides an anti-cracking additive for concrete and further provides application of the anti-cracking additive for concrete in cracking prevention of concrete. The anti-cracking additive for concrete is simple in preparation process and low in cost and can be used for directly regulating a hydration process of cement. On the premise that the final total heat release of cement is not affected, the hydration heat release of cement is uniformly distributed in a longer time and centralized heat release during hydration is reduced, so that the temperature rise of concrete is reduced and the temperature stress is reduced, and therefore, the anti-cracking purpose is achieved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a concrete anti-cracking admixture. Background technique [0002] Concrete crack control is one of the most important problems in construction engineering. The main reason is that external constraints limit the shrinkage and deformation of concrete and then generate tensile stress. When the tensile stress exceeds the tensile strength of concrete, cracking will occur; and Among them, temperature shrinkage deformation is the largest shrinkage form, especially in thin-walled and large-volume structures. [0003] The main cause of temperature stress is the temperature difference between different periods and different parts of concrete, and the essential reason is cement hydration. Cement hydration is divided into induction period, acceleration period, deceleration period and stable period; among them, the cement in the acceleration period and deceleration period is in the process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/30
Inventor 王文彬王伟刘加平李磊张小磊田倩徐文
Owner JIANGSU SOBUTE NEW MATERIALS
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