Special masonry mortar for self-insulating wall

Abstract

The invention relates to masonry mortar special for self-insulation walls, which is a powdery mixture and consists of the components with the following weight portions of 52-68 portions of cementing materials, 20-36 portions of gradation aggregates, 12-25 portions of vitrified hollow micro-pearl, 0.2-0.26 portions of redispersibility emulsion, 3-12 portions of thickener rheology agent, 0.05-0.3 portions of water retaining agent, 0.05-0.3 portions of anti-fissure strengthening agent and 0.012-0.035 portions of anti-entraining agent. The invention has the advantages of good water retention, lowheat conductivity, high mechanical strength, good flexible crack resistance, good waterproof performance, good dry shrinkage resistance, good fireproof performance, easy construction, high performance-price ratio, energy saving performance, etc.

Description

technical field [0001] The invention relates to a building mortar, in particular to a masonry mortar specially used for self-insulating walls. Background technique [0002] Building energy conservation is in line with national industrial policies. In order to achieve building energy conservation, it is necessary to improve the energy-saving indicators of the building envelope, especially the wall. With the deepening of building energy conservation, various new wall materials such as concrete hollow blocks, autoclaved aerated concrete block bricks, lightweight A variety of wall materials with independent thermal insulation functions such as porous bricks and fly ash block bricks have been widely used. However, at present, most of the masonry mortars matched with the above-mentioned self-insulating wall materials are ordinary mortars. When the self-insulating wall is used together, due to the characteristics of the self-insulating wall block (brick) of large water absorption...

AI Technical Summary

Problems solved by technology

[0003] 1. When ordinary mortar is used for masonry and plastering of self-insulating walls, the fullness of the gap mortar and the good adhesion of the two cannot be guaranteed, which is one of the main reasons for the cracking of self-insulating walls

This is due to the poor water retention of ordinary mortar, the moisture in the mortar is quickly absorbed, the hydration cannot be fully carried out, and the bond strength cannot be achieved; secondly, the shrinkage value of ordinary mortar and self-insulating blocks is different, and the volume change makes The block is under tension, and the two adjacent mortars are under compression. When the tensile stress is greater than the tensile strength, either the block is broken, or the seam is damaged or the connection of the blocks is damaged, resulting in cracking of the wall.

[0004] 2. As a self-insulating wall, ordinary mortar is used to build and plaster the surface is the main cause of cold and heat bridges, which seriously damages the insulation effect

However, the actual engineering use results show that the use of insulating mortar mixed with polystyrene foam particles for masonry and plastering of self-insulating walls, due to the large difference in the volume stability of organic foam and inorganic materials, especially this Such foam particles tend to produce irreversible volume changes under the condition of high temperature of 70°C, which can easily lead to hollowing and cracking of masonry mortar, thus failing to meet the long-term use requirements of self-insulating walls; "Light vitrified microbead mortar" uses plastering gypsum as the cementitious material, light vitrified microbeads as the aggregate, its thermal conductivity is 0.07W / m·k, and its compressive strength is only slightly greater than 1Mpa. The joint strength is only slightly greater than 0.2Mpa, and the strength needs to be improved for masonry and plastering dedicated to self-insulating walls