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Alkali-activated slag mortar

A slag sand and alkali-activated technology, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of ordinary alkali-activated slag mortar's anti-carbonation performance, anti-freeze-thaw cycle performance, anti-chloride ion penetration performance and Low interface density, inability to increase the freeze-thaw cycle resistance of mortar, poor bonding, etc., to achieve the effects of improving waste utilization, saving resources and environmental protection, and simplifying utilization methods

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary alkali-activated slag mortar uses ordinary sand as fine aggregate, and ordinary sand has no pores inside, which cannot increase the freeze-thaw cycle resistance of the mortar
The ability of ordinary alkali-activated slag mortar to resist chloride ion penetration mainly depends on the content of free alkali in the mortar system and the density of the mortar, and the bonding between ordinary sand and slurry is poor
The composition of ordinary alkali-activated slag mortar is quite different from that of ordinary sand, and the bonding between the two is poor
In short, the anti-carbonation performance, anti-freeze-thaw cycle performance, anti-chloride ion penetration performance and interface compactness performance of ordinary alkali-activated slag mortar are all low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Carry out the carbonation resistance test of mortar: for the alkali-activated slag mortar prepared from test sample 1 to test sample 6, the carbonation resistance test of the mortar was carried out according to the standard GB / T 50082-2009 of "Test Methods for Long-term Performance and Durability of Ordinary Concrete". The test results are shown in Table 1.

[0041]Table 1 Mortar anti-carbonization test results

[0042]

[0043] As can be seen from Table 1, for test sample 1 and sample sample 2, when 3 days and 14 days, the carbonation depth of the alkali-activated slag mortar of the present invention is equivalent to the carbonation depth of common alkali-activated slag mortar; The carbonization depth of alkali-activated slag mortar is smaller than that of ordinary alkali-activated slag mortar. For test sample 3 and sample sample 4, at 3 days, the carbonization depth of the alkali-activated slag mortar of the present invention was equivalent to that of ordinary alk...

Embodiment 2

[0046] Conduct the freeze-thaw cycle performance test of mortar: test the alkali-activated slag mortar prepared from test sample 1 to test sample 6 according to the standard JGJ70-2009 of the "Basic Performance Test Method for Building Mortar", and end the test after 100 freeze-thaw cycles. The results are shown in Table 2.

[0047] Table 2 Mortar freeze-thaw cycle test results

[0048]

[0049] It can be seen from Table 2 that the mass loss rate of test sample 1 is 0.05%, the strength loss rate is 2.28%, the mass loss rate of sample sample 2 is 0.43%, and the strength loss rate is 8.88%. Both the mass loss rate and the strength loss rate of the test sample 1 are smaller than those of the test sample 2. The mass loss rate of test sample 3 is less than that of test sample 4, and the strength loss rate of test sample 3 is less than that of test sample 4. Likewise, the mass loss rate of test sample 5 is smaller than that of test sample 6, and the strength loss rate of test s...

Embodiment 3

[0051] Conduct the chloride ion penetration resistance test of mortar: for the alkali-activated slag mortar prepared from test sample 1 to test sample 6, carry out the chloride ion resistance of the mortar according to the standard GB / T 50082-2009 of "Test Method for Long-term Performance and Durability of Ordinary Concrete" Penetration testing. The test results are shown in Table 3.

[0052] Table 3 The results of the anti-chloride ion penetration test of alkali-activated slag mortar

[0053]

[0054] It can be seen from Table 3 that the 6h electric flux value of test sample 1 is 653.04C, and the 6h electric flux value of test sample 2 is 787.98C. Although the chloride ion permeability coefficients of test sample 1 and test sample 2 are both very low, the 6h electric flux value of test sample 1 is smaller than that of test sample 2, and the resistance to chloride ion penetration of test sample 1 is better than that of test sample 2. Similarly, it can be seen from Table 3...

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Abstract

The invention discloses alkali-activated slag mortar. The alkali-activated slag mortar consists of the following components in part by weight: 100 parts of mineral powder, 100 to 300 parts of water slag, 4 to 15 parts of alkali activator and 30 to 60 parts of water. The alkali-activated slag mortar can improve carbonization resistance, freeze-thaw cycle resistance, chloride ion penetration resistance and interface compactness of the mortar, provides a new route of water slag utilization and increases the utilization ratio of wastes.

Description

technical field [0001] The invention relates to a building material, in particular to an alkali-activated slag mortar. Background technique [0002] At present, the materials used in the common alkali activated slag mortar on the market are slag powder, ordinary sand, alkali activator and water. The hydration product of ordinary alkali-activated slag mortar is a low C / S C-S-H gel without calcium hydroxide, so ordinary alkali-activated slag mortar is more prone to carbonization than ordinary cement mortar. Ordinary alkali-activated slag mortar uses ordinary sand as fine aggregate, and ordinary sand has no pores inside, which cannot increase the freeze-thaw cycle resistance of the mortar. The anti-chloride ion penetration ability of ordinary alkali-activated slag mortar mainly depends on the content of free alkali in the mortar system and the density of mortar, and the bonding between ordinary sand and slurry is poor. The composition of ordinary alkali-activated slag mortar ...

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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