Crack-resisting masonry mortar for air-entrapping brick wall body, prepared from desulfurization gypsum powder

Abstract

The invention relates to a method for preparing a crack-resisting masonry mortar for an air-entrapping brick wall body from desulfurization gypsum powder in the construction industry. The cracking-resisting masonry mortar is prepared by mainly using a desulfuration product (desulfuration gypsum) of a power plant as a main raw material. The preparation method comprises the step of doping 1-5 thousandths of cellulose fiber, 0.1-3 thousandths of retarder, 0.2-50 thousandths of water retaining agent, 0.5-5 percent of reinforcing agent, 10-30 percent of mineral doping material and 10-40 percent of fine river sand to obtain the crack-resisting masonry mortar with excellent property. The invention develops a new method for producing the excellent gypsum based masonry mortar with high crack resistance, low contraction distortion, high binding power, high strength and low cost by using the desulfuration gypsum, develops a new method for the comprehensive utilization of the desulfuration gypsum as a sold waste, and solves the problem of cracking of wall bodies of an air-entrapping brick, a flyash brick and the like in China at present.

Description

Technical field: [0001] The invention relates to an anti-crack masonry mortar for an aerated brick wall prepared by using desulfurized gypsum powder, in particular to an anti-crack mortar for an aerated brick wall prepared by using desulfurized gypsum powder and a preparation method thereof. Background technique: [0002] The most widely used and effective sulfur dioxide control technology in thermal power plants is the lime / limestone-gypsum method. The desulfurization mechanism of lime / limestone-gypsum method and the formation process of desulfurized gypsum are as follows: the flue gas after dust removal is introduced into the absorber, and the fine lime or limestone powder slurry is sprayed to wash the flue gas in the absorber. The sulfur dioxide in the air reacts to generate calcium sulfite, and then the air is passed through to oxidize the calcium sulfite into calcium sulfate dihydrate to form desulfurized gypsum. At present, the utilization rate of desulfurized gypsum ...

AI Technical Summary

Problems solved by technology

At present, the utilization rate of desulfurized gypsum in my country is still very low. Although a few power plants have built gypsum processing projects, their utilization is very small and has not become the mainstream. The second largest solid waste, with the construction of a large number of desulfurization projects in thermal power plants in my country, the discharge of desulfurized gypsum has increased sharply. If it is discarded and stockpiled, it is necessary to build a special storage yard, which not only requires a huge investment, but also takes up a lot of valuable land resources. adversely affect the surrounding living environment

[0003] The current masonry mortar mainly uses cement as the main cementitious material. Due to the large shrinkage characteristic of ordinary cement itself, the shrinkage deformation of the prepared masonry mortar is relatively large.

If a certain amount of expansion agent is mixed into the masonry mortar, it will increase the cost of the masonry mortar, and the amount is not easy to control, and the performance is unstable

The cracking of walls such as aerated bricks and fly ash bricks seriously affects the engineering quality of the walls, and has become a bottleneck restricting the popularization and application of aerated bricks, fly ash bricks and other wall materials in construction

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