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Alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking

A technology of alkali excitation and slag sand, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of reducing the drying shrinkage of mortar and the compatibility of high-cost shrinkage reducing agents, so as to reduce drying shrinkage, Reduce and plastic cracking, reduce the effect of plastic cracking

Active Publication Date: 2012-07-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding shrinkage reducing agent to alkali-activated slag mortar can reduce the drying shrinkage of mortar, but there are high cost and compatibility problems between shrinkage reducing agent and alkali-activated slag mortar

Method used

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  • Alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking
  • Alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking
  • Alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The strength performance test of the mortar is carried out: for the alkali-activated slag mortar prepared from the test sample 1 to the test sample 6, the strength performance test of the mortar is carried out according to the standard GB / T 17671-1999 of "Cement Mortar Strength Test Method". The test results are shown in Table 2.

[0038] Table 2 Flexural strength and compressive strength of alkali-activated slag mortar

[0039]

[0040]As can be seen from Table 2, comparing test sample 1 and sample sample 2, in 3 days, the flexural strength of test sample 1 was less than the flexural strength of sample sample 2, but also only poor 1.19Mpa, the compressive strength of test sample 1 Greater than the compressive strength of sample sample 2, the difference is only 0.3Mpa; at 28 days, the flexural strength of test sample 1 is equal to that of sample sample 2, and the compressive strength of test sample 1 is greater than that of sample sample 2 of compressive strength. ...

Embodiment 2

[0043] Drying shrinkage performance test of mortar: For the alkali-activated slag mortar prepared from test sample 1 to test sample 6, the drying shrinkage performance test of mortar was carried out according to the standard JGJ / T70-2009 of "Basic Performance Test Methods of Building Mortar". The test results are shown in Table 3.

[0044] Table 3 Alkali-induced slag mortar drying shrinkage test results / 10-6

[0045]

[0046] As can be seen from Table 3, for the test sample 1 and the test sample 2, the drying shrinkage of the test sample 1 is reduced compared with the test sample 2. Taking the 90-day drying shrinkage value as an example, the drying shrinkage of the test sample 1 is 24% lower than that of the test sample 2. %; For test sample 3 and test sample 4, test sample 3 has reduced drying shrinkage than test sample 4, taking 90 days drying shrinkage value as example, the drying shrinkage of test sample 3 has reduced 34% than test test sample 4; For For test sample ...

Embodiment 3

[0049] Conduct the plastic cracking performance test of the mortar: for the alkali-activated slag mortar prepared from the test sample 1 to the test sample 6, the plastic cracking performance test of the mortar was carried out according to the standard JC / T951-2005 of "Test Method for Cracking Resistance of Cement Mortar". The test results are shown in Table 4.

[0050] Table 4 Mortar plastic cracking resistance test results

[0051]

[0052] It can be seen from Table 4 that the cracking index of sample 1 is 260mm, and the maximum crack width is 0.9mm. The crack index of test sample 2 was 729 mm, and the maximum crack width was 1.7 mm. Whether it is the cracking index or the maximum crack width, the test sample 1 is obviously smaller than the test sample 2. That is to say, the plastic cracking resistance of Test Sample 1 is better than that of Test Sample 2. The cracking index of test piece sample 3 was 832 mm, and the maximum crack width was 1.5 mm. The crack index of ...

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Abstract

The invention discloses an alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking, and the alkali-activated slag mortar comprises the following components in parts by weight: 100 parts of mineral powder, 100-300 parts of water granulated slag, 4-15 parts of alkali-activated agent, 30-60 parts of water and 1-15 parts of rubber, wherein the rubber is rubber particlesor rubber powder. The mechanical strength of the alkali-activated slag mortar prepared by the components can be maintained at the existing level, and the drying shrinkage and the plastic cracking areobviously reduced.

Description

technical field [0001] The invention relates to a building material, in particular to an alkali-activated slag mortar capable of reducing drying shrinkage and plastic cracking. Background technique [0002] Foreign scholars have studied the drying shrinkage of alkali-activated slag mortar, adding shrinkage reducing agents, dihydrate gypsum, and air-entraining agents to the alkali-activated slag mortar matrix to reduce the drying shrinkage of alkali-activated slag mortar. The results found that: Adding air-entraining agent to slag mortar can significantly reduce the drying shrinkage of mortar, and the strength of mortar is lower. Adding air-entraining agent to alkali-activated slag mortar is the best way to reduce drying shrinkage, but there is a problem of high cost. Adding dihydrate gypsum to the alkali-activated slag mortar can reduce the drying shrinkage of the mortar, but the reduction range is limited. The mechanism is that the ettringite-like substances are formed in t...

Claims

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Application Information

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IPC IPC(8): C04B18/22C04B18/14
CPCY02W30/91
Inventor 张亚梅朱正贵
Owner SOUTHEAST UNIV
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