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Concrete hydration heat inhibition material

A hydration heat suppression and concrete technology, which is applied in the field of building material concrete admixtures, can solve the problems of hydration heat suppression performance, economical and environmental protection to be improved, etc., so as to optimize the cement hydration process, improve durability, improve performance effect

Active Publication Date: 2014-10-15
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the currently published patents, the heat of hydration inhibiting material is mainly prepared by hydrolysis of starch, and the preparation method is mainly catalyzed by traditional acid hydrolysis, and it is used in combination with an expansion agent material, which inhibits the heat of hydration performance, Economy and environmental protection still need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 10wt% starch and 0.01wt% high temperature-resistant α-amylase with water, heat in a water bath to 90°C, react for 0.2 hours, cool, add hydrochloric acid to adjust pH = 1 to inactivate α-amylase, and then use alkali Neutralize until the pH is neutral, dry and pulverize to obtain dextrin powder, and the DE value of the prepared dextrin is 6.

[0030] Mix 10wt% dextrin and 1wt% sodium hydroxide with water, add 0.5wt% propylene oxide dropwise at a constant speed at 0°C, put it in a constant temperature water bath at 30°C, react for 12h, and neutralize with hydrochloric acid to neutral , after spray drying, 95% ethanol was dissolved and filtered to remove inorganic salts, and the filtrate was dried to obtain a modified heat of hydration inhibiting material.

[0031] Add the prepared hydration heat inhibiting material into the concrete mixing process (the amount is 0.5wt% of the cement amount), and the concrete mix ratio is as follows: 162kg of water, 360kg of cement ("Ji...

Embodiment 2-12

[0033] See Table 1.

[0034] Table 1 Example 2-12

[0035]

[0036]

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Abstract

The invention belongs to the technical field of building material concrete admixtures, and particularly relates to a concrete hydration heat inhibition material and a preparation method thereof. The control of dextrin DE (dextrose equivalent) value can be realized by regulation of preparing parameters of the enzyme catalyzed hydrolysis process, and by combination with different degrees of epoxypropane modification, the concrete hydration heat inhibition material is prepared. The prepared concrete hydration heat inhibition material has the comprehensive advantages of simple operation and green environmental protection, can effectively regulate and control the hydration process of cement, reduces the concrete cracking problem caused by larger inside and outside temperature difference the cause, and improves the concrete durability.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, in particular to a concrete hydration heat inhibiting material and a preparation method thereof. Background technique [0002] The shrinkage caused by the temperature difference between the inside and outside of the concrete caused by the heat release of cement hydration is an important reason for concrete cracking, especially in large-volume concrete, the temperature difference between the inside and outside of the concrete can reach more than 40 degrees, which leads to the use of cooling water pipes and low-heat cement in site construction. Controls concrete cracking problems caused by temperature. [0003] In recent years, scholars at home and abroad have proposed to regulate the hydration process of concrete through admixtures, so as to reduce the risk of concrete temperature shrinkage and cracking. For example, the Chinese invention patent with the publica...

Claims

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Application Information

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IPC IPC(8): C04B24/38
Inventor 李磊王文彬王育江田倩刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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