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Cement admixture for inhibiting alkali-aggregate reaction, and preparation method thereof

A technology of cement admixture and alkali aggregate, which is applied in the field of building materials and can solve the problems of inconspicuous inhibition effect and cumbersome use process

Active Publication Date: 2021-03-02
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the measures to prevent ASR mainly include the use of low-alkali cement and strict control of the alkali content of each component in concrete, the use of highly active admixtures, such as fly ash, silica fume, metakaolin and other auxiliary gel materials; the use of chemical inhibitors , these measures provide certain measures for the prevention of alkali-aggregate reaction in the project, but the inhibitory effect is not obvious
[0006] CN109608085A provides a kind of alkali-aggregate reaction inhibitor, this method has good inhibitory effect to alkali-aggregate reaction, but its use process in concrete, needs to dissolve part of components in water at first, add cement slurry Medium; and then add other components to the cement paste separately, for a product, the use process is more cumbersome

Method used

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  • Cement admixture for inhibiting alkali-aggregate reaction, and preparation method thereof
  • Cement admixture for inhibiting alkali-aggregate reaction, and preparation method thereof
  • Cement admixture for inhibiting alkali-aggregate reaction, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) After cleaning, drying and grinding the collected waste glass bottles, the obtained waste glass powder, slag and slag are mixed into the ball mill according to the weight ratio of 2:1:1, and the ball mill is used to control the ball milling time for grinding , to obtain a particle size of 68.17μm and a specific surface area of ​​217.00m 2 / kg of waste mixture;

[0039] (2) Soak the wool in 0.13mol / l triethanolamine solution at 50°C, pretreat for 30 minutes, take it out and dry it for later use.

[0040] (3) The waste mixture after grinding is uniformly mixed with the pretreated wool, alkylbenzenesulfonate, gelatin and lithium sulfate in proportion to obtain the cement admixture. Among them, the weights of waste mixture, wool, alkylbenzenesulfonate, gelatin, and lithium sulfate are: 75g, 3g, 5g, 0.5g, and 16.5g, respectively.

Embodiment 2

[0042] (1) After cleaning, drying and grinding the collected waste glass bottles, the obtained waste glass powder, slag and slag are mixed into the ball mill according to the weight ratio of 2:1:1, and the ball mill is used to control the ball mill grinding, Obtained particle size 80μm, specific surface area 280.00m 2 / kg of waste mixture;

[0043] (2) Soak the wool in 0.13mol / l triethanolamine solution at 55°C, pretreat for 45 minutes, take it out and dry it for later use.

[0044] (3) The waste mixture after grinding is uniformly mixed with the pretreated wool, alkylbenzenesulfonate, gelatin and lithium sulfate in proportion to obtain the cement admixture. Wherein, the weight ratios of waste mixture, wool, alkylbenzenesulfonate, gelatin and lithium sulfate are: 80g, 3g, 3g, 0.03g, 13.7g respectively.

Embodiment 3

[0046] (1) After cleaning, drying and grinding the collected waste glass bottles, the obtained waste glass powder, slag and slag are mixed into the ball mill according to the ratio of 2:1:1 by weight, and the particle size is obtained by ball milling with the ball mill. 10-200μm, specific surface area 100-900m 2 / kg of waste mixture;

[0047] (2) Soak the wool in 0.13 mol / l triethanolamine solution at 52°C, pretreat for 1 hour, take it out and dry it for later use.

[0048] (3) The waste mixture after grinding is uniformly mixed with the pretreated wool, alkylbenzenesulfonate, gelatin and lithium sulfate in proportion to obtain the cement admixture. Wherein, the weight ratios of waste mixture, wool, alkylbenzenesulfonate, gelatin and lithium sulfate are: 70g, 3g, 5g, 0.5g, 21.5g respectively.

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Abstract

The invention discloses a cement admixture for inhibiting alkali-aggregate reaction. The cement admixture comprises the following components in parts by weight: 30-40 parts of waste glass powder, 15-20 parts of furnace slag, 15-20 parts of mineral slag, 3 parts of wool, 0.3-0.5 part of gelatin, 3-5 parts of alkyl benzene sulfonate sulfate and 10-22 parts of lithium sulfate. The method comprises the following steps: cleaning, airing and grinding waste glass bottles, mixing the waste glass bottles with furnace slag and mineral slag, and performing ball milling to obtain a waste mixture; and uniformly mixing the waste mixture with wool, alkylbenzene sulfonate sulfate, gelatin and lithium sulfate to obtain the cement admixture capable of inhibiting the alkali-aggregate reaction. The preparation process is simple, the use is convenient, the inhibition effect on the alkali aggregate reaction is obvious, the green and environment-friendly effects are realized, and the prepared concrete has excellent performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement admixture for inhibiting alkali-aggregate reaction and a preparation method thereof. Background technique [0002] Alkali-Aggregate Reaction AAR (Alkali-Aggregate Reaction) is the alkali (Na 2 O or K 2 O) React with the active components in the aggregate, and the reaction product absorbs water and expands, causing the concrete to generate internal stress, expand and crack, and cause the concrete to lose its design performance. Generally, AAR can be divided into two categories according to the active ingredient involved in the reaction: Alkali-Silica Reaction (ASR) and Alkali-Carbonate Reaction (ACR). ASR refers to the chemical reaction in which alkali in concrete reacts with active silica in aggregate to form alkali silica gel. The reactants are alkaline ions such as Na+ and K+ in active silica and concrete pore solution. The following formula ...

Claims

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Application Information

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IPC IPC(8): C04B24/38
CPCC04B40/0039C04B14/22C04B18/141C04B18/142C04B18/18C04B22/147C04B24/20C04B24/38
Inventor 赵日煦王淑高飞王婵吴媛媛郭睿
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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