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A cement hydration heat inhibiting composition and its preparation method and application

A cement hydration and thermal suppression technology, applied in the field of concrete admixtures, can solve problems such as poor effect, reduced concrete durability, and reduced concrete strength, and achieves the advantages of reducing heating and cooling rates, improving corrosion resistance, and reducing corrosion. Effect

Active Publication Date: 2018-12-21
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 materials through hydrolysis or high-temperature gelatinization modification, and their hydration temperature rise control performance in actual concrete structures can only control the induction period of hydration heat release. It has poor effect on the late hydration exothermic reaction period, which greatly reduces the durability of concrete

Method used

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  • A cement hydration heat inhibiting composition and its preparation method and application
  • A cement hydration heat inhibiting composition and its preparation method and application
  • A cement hydration heat inhibiting composition and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, the preparation of boron phenolic / acrylic resin blend

[0042] A mix 9 parts of methyl methacrylate, 7 parts of hydroxyethyl acrylate, 7 parts of isooctyl acrylate and 3 parts of butyl acetate to obtain a mixture;

[0043] B Add 1 / 2 of the mixture obtained in step A into 11 parts of n-butanol and stir until dissolved, then raise the temperature to 120°C, after heating for 25 minutes, add the remaining mixture obtained in step A dropwise at a rate of 0.5g / min, drop After the addition, the temperature was raised to 120°C for 2 hours of heat preservation reaction to obtain a polymer, and n-butanol was recovered under reduced pressure;

[0044] C Add 27 parts of diisocyanate to the polymer obtained in step B, raise the temperature to 75°C, keep the temperature for 3 hours, then lower the temperature to 50°C, add 27 parts of pentaerythritol, then add 0.04 parts of stannous octoate, raise the temperature to 80°C, and keep the temperature for reaction 2.5h, the ...

Embodiment 2

[0047] Embodiment 2, the preparation of modified diatomite

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

[0049] b. dissolving xylitol in water and stirring until completely dissolved, then adding the acidic diatomite powder obtained in step a and stirring, the weight ratio of xylitol and acidic diatomite powder is 6:1, forming a uniform colloid shape, dried, ground, that is.

Embodiment 3

[0050] Embodiment 3, a kind of cement hydration heat suppression composition

[0051] The cement hydration heat inhibiting composition consists of the following components and parts by weight thereof:

[0052] 48 parts of boron phenolic / acrylic resin blends, 5 parts of epoxy phosphates, 8 parts of tartaric acid and 15 parts of modified diatomaceous earths; Acrylic resin blend, the modified diatomite is the modified diatomite prepared in Example 2.

[0053] Preparation:

[0054] S1 first takes the boron phenolic / acrylic resin blend and epoxy phosphate and stirs it evenly to obtain the mixture;

[0055] S2 Stir tartaric acid and modified diatomaceous earth evenly, then add to the mixture obtained in step S1, mix evenly, granulate, pass through 10-60 meshes, and obtain.

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Abstract

The invention belongs to the technical field of a concrete additive, and particularly relates to a cement hydration heat inhibiting composition as well as a preparation method and application thereof.The cement hydration heat inhibiting composition provided by the invention is mainly prepared from boron phenolic aldehyde / acrylic resin blending materials, epoxy phosphate, tartaric acid and modified kieselguhr. A prepared hydration heat regulation and control composition can effectively inhibit the release of hydration heat; the hydration speed at different stages in the cement hydration process can be regulated and controlled to different degrees, so that the effect of reducing the total heat release quantity at the early period is achieved; meanwhile, the generation of hydration heat canbe continuously reduced; the phenomenon of concrete cracking can be effectively reduced; the durability and the safety of concrete component are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a cement hydration heat inhibiting 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/30
CPCC04B40/0039C04B2103/0089C04B24/2688C04B24/30C04B24/06C04B22/06C04B24/02C04B24/003
Inventor 谢祥明李意余青山
Owner GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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