Preparation method of anti-shrinkage autoclaved aerated concrete block dry powder masonry mortar

Abstract

The invention provides a preparation method of novel anti-shrinkage dry powder masonry mortar special for autoclaved aerated concrete blocks, and the components and ratios are: 15%-20% of anhydrite, 25%-35% of portland cement, 5%-16% of lime powder, 33%-54% of dry sand (20-40 meshes), 0.6%-0.8% of redispersable latex powder, 0.3%-0.5% of cellulose ether, and 0.4%-0.6% of calcium formate. The dry shrinkage value of the dry powder mortar is adjusted by adding cement and gypsum, and thus is close to a dry shrinkage value of an autoclaved aerated concrete block; the dry shrinkage value of a material for bonding the mortar is close to the dry shrinkage value of the autoclaved aerated concrete block; the synchronization of the shrinkage and the expansion overcomes quality accidents of empty drum, sun crack, and even shedding of masonry and floated coats caused by excessively rapid water loss of walls; and the invention has good value for popularization and application.

Description

1. Technical field [0001] The invention belongs to the technical field of building materials, in particular to a preparation method of special dry powder mortar. 2. Background technology [0002] Autoclaved aerated concrete blocks (hereinafter referred to as aerated blocks) have been popularized and applied in my country for more than 30 years. For such a new type of wall material with light weight and good thermal insulation performance, it should be vigorously promoted. , but for a long time, the aerated block masonry is still built with traditional masonry technology, and the traditional masonry mortar is used in conjunction with the facing method, which makes the wall have "cracks, seepage, leakage" and other stubborn problems. Mainly because autoclaved aerated concrete block walls are easy to shrink, which seriously affects the use and appearance of buildings, thus greatly affecting the popularization and application of aerated blocks. The shrinkage of the block wall is ...

AI Technical Summary

Problems solved by technology

The elastic modulus of small blocks is 1.6 to 7.2 times higher than that of brick masonry, and the shrinkage value of blocks is 2 to 6 times larger than that of brick masonry, so the shrinkage stress of masonry is much larger than that of brick walls. When the tensile and shear strength are not enough to resist the shrinkage stress, the wall will be deformed and cracked, and the plaster layer will be hollowed out, cracked and even fall off from time to time, which seriously affects the promotion of new wall materials and the quality of construction projects.