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Rapid repair mortar and repair process special for autoclaved aerated concrete slab

A technology of repairing mortar and autoclaved aeration, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of improving the site, repairing efficiency, and reducing the repairing cycle

Inactive Publication Date: 2016-08-17
SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are very few relevant reports on the repair technology of autoclaved aerated concrete slabs. CN103951340A discloses a special repair mortar for low-density autoclaved aerated concrete slabs. It is made based on white Portland cement. The drying shrinkage is serious, it is easy to crack after repairing, and the setting time is long, which leads to a prolonged repair period, low repair efficiency, and requires a large amount of storage space
CN102535733A discloses a method for repairing defective panels of autoclaved aerated concrete. The repairing process can only be carried out with a cutter after 2 to 4 hours after the repairing mortar is applied, which will also lead to prolonged repairing period and low repairing efficiency

Method used

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  • Rapid repair mortar and repair process special for autoclaved aerated concrete slab

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Mix 60kg of building gypsum powder, 30kg of primary fly ash, 9.1kg of fine sand, 0.8kg of redispersible latex powder and 0.1kg of hydroxypropyl methyl cellulose ether and stir evenly, add 28kg of tap water and stir evenly , That is, repair mortar mixture.

[0034] Test the compressive strength, expansion rate and setting time of the obtained repair mortar mixture according to the standard, and carry out the repair work according to the repair process. The compressive strength is 1.2 MPa greater than that of the aerated concrete plate, and the expansion rate will not increase after 4 hours , the final setting time is 6 minutes, the color of the repair mortar is basically the same as that of the aerated concrete slab after drying, and the repair body has no cracks for 3 months. Compared with the repairing mortars disclosed in CN103951340A and CN102535733A, the final setting time is too short, although the repairing speed is greatly accelerated, but the operatin...

Embodiment 2

[0035] Embodiment 2: 60kg white cement, 30kg primary fly ash, 9.1kg fine sand, 0.8kg redispersible latex powder and 0.1kg hydroxypropyl methyl cellulose ether are mixed and stirred evenly, and 28kg tap water is added and stirred evenly, That is, the repair mortar mixture is obtained.

[0036]Test the compressive strength, expansion rate and setting time of the obtained repair mortar mixture according to the standard, and carry out the repair work according to the repair process. The compressive strength is 2.5 times that of the aerated concrete plate, and the shrinkage rate still increases after 28 days , the final setting time is 4 hours, the color of the repair mortar is basically consistent with that of the aerated concrete slab after drying, and the repair body will have cracks within one month. Compared with the repair mortars disclosed in CN103951340A and CN102535733A, the final setting time does not change, the repair efficiency does not increase significantly, and it i...

Embodiment 3

[0037] Embodiment 3: in the repair dry powder mortar that makes in embodiment 1, add 28kg concentration and be the borax aqueous solution of 0.40% and stir evenly, obtain the repair mortar mixture.

[0038] Test the compressive strength, expansion rate and setting time of the obtained repair mortar mixture according to the standard, and carry out the repair work according to the repair process. The compressive strength is 0.8 MPa greater than that of the aerated concrete plate, and the expansion rate will not increase after 4 hours , the final setting time is 10 minutes, the color of the repair mortar is basically the same as that of the aerated concrete slab after drying, and the repair body has no cracks for 3 months. Compared with the repairing mortars disclosed in CN103951340A and CN102535733A, the final setting time is too short, although the repairing speed is greatly accelerated, but the operating time of the repairing mortar mixture is too short, which is not suitable f...

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Abstract

The invention discloses a rapid repair mortar and a repair process for an autoclaved aerated concrete slab. The repair mortar takes gypsum mortar as a substrate material doped with a functional admixture, and is characterized by comprising the following components in parts by weight: 90-100 parts of gypsum mortar, 0.5-1.5 parts of an additive, and 25-30 parts of a retarder aqueous solution. The repair process comprises the following steps: cleaning a damaged surface, mixing the repair mortar, smearing a small amount of the mortar on the damaged surface and squeezing and compacting the mortar at first, then filling a damaged part compactly with a large amount of the mortar, trimming and flattening the mortar after final set of the mortar, and finally, performing polishing. The repair technology has the characteristics of convenience in operation, high repair speed, basically no chromatic aberration, and firm agglutination between the repair mortar and an autoclaved aerated concrete base, and the like, so that the repair efficiency can be greatly improved, and the damage rate is reduced.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a rapid repair technology for autoclaved aerated concrete panels. Background technique [0002] Autoclaved aerated concrete slabs are made of silicon and calcium as raw materials, aluminum powder (paste) as an air-generating agent, reinforced with anti-rust steel bars, and cured by high-temperature and high-pressure steam to form high-performance, porous concrete. sheet. It has the characteristics of light weight, good thermal insulation performance, good machinability, fast construction speed, strong bearing capacity, and low comprehensive cost. It can be used for walls, floors and roof panels in industrial and civil buildings. It is a new type of energy-saving building material strongly advocated by the state. However, aerated concrete slabs are brittle products. During the production process, such as cutting, breaking, hoisting, transportation, and installation, the aerated...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B28/04C04B14/06C04B18/08C04B24/26C04B24/38
CPCC04B28/04C04B28/14C04B18/08C04B14/06C04B24/26C04B24/383Y02W30/91
Inventor 吴鑫刘登贤袁泽洋张旭于世超
Owner SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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