A kind of gypsum-cement machine spray dry powder mortar and its construction method

Abstract

a kind of plaster — Cement machine spray dry powder mortar and its construction method, the gypsum — Cement machine spray dry powder mortar made of gypsum — It is made by mixing cement, cellulose ether, early strength agent, and redispersible rubber powder. The weight ratio of each component material is: gypsum — Cement 20%~75%, cellulose ether 0.01%~0.4%, early strength agent 0~0.6%, redispersible rubber powder 0~4%, fine sand 25%~80%, lignin fiber 0~0.6%. The present invention also includes the gypsum — The construction method of dry powder mortar sprayed by cement machine. Gypsum of the present invention — Dry powder mortar sprayed by cement machine can be used as machine sprayed mortar for interior wall and machine sprayed mortar for exterior wall. After testing, after one year of construction, after inspection, there is no hollowing, falling off, no cracks and no cracks, and the construction performance is excellent.

Description

technical field [0001] The invention relates to a dry powder mortar and a construction method thereof, in particular to a gypsum-cement machine spray dry powder mortar for interior and exterior wall plastering and a construction method thereof. Background technique [0002] Traditional cement plastering mortar has been widely used due to its high strength and good water resistance. But there are also the following defects: 1. The curing shrinkage value is large. Within 40 days after the construction of cement mortar, the curing shrinkage increases rapidly, and the shrinkage is proportional to the time. In 40 days to one year, the curing shrinkage has been occurring; 2. The dry shrinkage value is large, and the dry shrinkage value of cement mortar is generally 0.8-1.0mm / m, which is 4-5 times that of gypsum mortar; 3. The thermal expansion and contraction value of cement mortar is similar to that of gypsum mortar, about 10×10 -6 . [0003] Due to the existence of the shrinka...

AI Technical Summary

Problems solved by technology

But there are also the following defects: 1. The curing shrinkage value is large. Within 40 days after the construction of cement mortar, the curing shrinkage increases rapidly, and the shrinkage is proportional to the time. In 40 days to one year, the curing shrinkage has been occurring; 2. The dry shrinkage value is large, and the dry shrinkage value of cement mortar is generally 0.8-1.0mm / m, which is 4-5 times that of gypsum mortar; 3. The thermal expansion and contraction value of cement mortar is similar to that of gypsum mortar, about 10×10-6

[0004] The existing gypsum plastering mortar (plaster plaster) has low curing shrinkage value or slight expansion, so it should be a good plastering mortar. However, due to the low strength and water resistance of gypsum, the application range of plaster plaster is limited.

[0005] In addition, the existing types of plastering mortars have low construction efficiency, high labor intensity and high construction cost

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