Hydration heat regulation composition, as well as preparation method and application thereof

A composition and heat of hydration technology, applied in the field of concrete admixtures, can solve the problems of reduced concrete strength, reduced concrete durability, poor effect, etc., and achieve the effects of reducing corrosion, reducing heating and cooling rates, and improving safety

Active Publication Date: 2018-07-31
GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the reduction of the central temperature of concrete with heat of hydration inhibitors is proportional to the reduction of strength. Although the current heat of hydration inhibitors play a role in cooling, they also reduce the strength of concrete.
Moreover, most of the hydration heat control materials are made of starch or dextrin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1. Preparation of cationic acrylic resin

[0042] A. Mix 9 parts of methyl methacrylate, 7 parts of hydroxyethyl acrylate, 7 parts of isooctyl acrylate and 2 parts of butyl acetate hair agent to obtain a mixture;

[0043] B. Add 1 / 2 of the mixture obtained in step A to 11 parts of n-butanol and stir to dissolve, then heat to 118°C, and after heating for 22 minutes, add the mixture obtained in the remaining step A dropwise at a rate of 0.4g / min. After the addition is complete, the temperature is raised to 120°C and the reaction is kept for 2 hours to obtain the polymer, and the n-butanol is recovered under reduced pressure;

[0044] C. Add 26 parts of diisocyanate to the polymer obtained in step B, raise the temperature to 75°C, keep the temperature for 2h, then cool to 48°C, add 26 parts of pentaerythritol, then add 0.03 part of stannous octoate, heat up to 80°C, keep the temperature for reaction 2h, get the chain-extended prepolymer;

[0045] D When the temperature of...

Example Embodiment

[0047] Example 2. Preparation of modified diatomite

[0048] a. Dry the diatomaceous earth, pass a 100-mesh sieve to obtain a fine powder, and then add it to hydrochloric acid with a volume concentration of 8%. The solid-to-liquid ratio of the fine powder to the hydrochloric acid is 1g:2mL, and the reaction is heated to 110°C for 3h, Cool, wash with water to neutral, and dry to obtain acid diatomaceous earth powder;

[0049] b. Dissolve xylitol in water and stir until it is completely dissolved, then add the acid diatomaceous earth powder obtained in step a and stir, the weight ratio of the xylitol to acid diatomaceous earth powder is 6:1, forming a uniform colloid Shape, dry, grind, and get.

Example Embodiment

[0050] Example 3. A hydration heat control composition

[0051] The hydration heat control composition consists of the following components and their parts by weight:

[0052] 48 parts of cationic acrylic resin, 14 parts of amino resin, 5 parts of epoxy phosphate, 8 parts of tartaric acid and 18 parts of modified diatomaceous earth; the cationic acrylic resin is the cationic acrylic resin prepared in Example 1. The modified diatomaceous earth is the modified diatomaceous earth prepared in Example 2.

[0053] Preparation:

[0054] S1 first take cationic acrylic resin, amino resin and epoxy phosphate and stir evenly to obtain a mixture;

[0055] In S2, the tartaric acid and the modified diatomaceous earth are evenly stirred, and then added to the mixture obtained in step S1 and mixed uniformly, and the granules are sized and passed through 10 to 60 meshes to obtain.

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PUM

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Abstract

The invention belongs to the technical field of concrete admixtures, and particularly relates to a hydration heat regulation composition, as well as a preparation method and application thereof. The hydration heat regulation composition provided by the invention is mainly prepared from a cationic-type acrylic resin, an amino resin, epoxy phosphate, tartaric acid and modified diatomite. According to the prepared hydration heat regulation composition, the release of hydration heat can be effectively inhibited, and hydration speeds in different stages during a cement hydration process can be regulated and controlled at different degrees, so that an effect of reducing the total heat release at an early stage is achieved; meanwhile, the production of hydration heat can be continuously reduced,the phenomenon of concrete cracking can be effectively reduced, and the durability and the safety of concrete components are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a hydration heat regulating composition and a preparation method and application thereof. Background technique [0002] Concrete, as the most widely used building material, has been widely used in industrial and civil buildings as well as in major projects. The biggest disadvantage of concrete is that it is prone to cracks, which affects its durability. Although the factors that cause concrete cracking include plastic shrinkage, dry shrinkage, temperature influence and other aspects, in recent decades, it has been found that the temperature deformation caused by the heat release of cement hydration has become the leading cause of concrete cracking. Cement hydration will release a lot of heat. When the heat released by cement hydration in concrete is too late to dissipate, the internal temperature of concrete will rise, and when the hydration stops later, ...

Claims

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Application Information

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IPC IPC(8): C04B24/28
CPCC04B40/0039C04B24/2641C04B24/282C04B24/281C04B24/06C04B14/08
Inventor 谢祥明李意余青山
Owner GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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