Microporous sintered bricks with interface bonding improved by redispersable rubber powder

Abstract

The invention discloses microporous sintered bricks sintered bricks with interface bonding improved by redispersable rubber powder. The microporous sintered bricks are made from, by weight, 40-43 parts of urban sludge, 8-9 parts of mesoporous silica, 22-25 parts of shales, 38-40 parts of coal gangue, 14-15 parts of rice husk, a proper amount of water, 2.5-3 part of potassium feldspar, 2-3 parts of paraffin, 0.8-1 part of polyvinyl alcohol, 2-3 parts of redispersable rubber powder and 11-13 parts of household garbage. The household garbage is added to green brick pug through a series of process modification, the microporous sintered bricks sintered bricks have stronger hydrophily by cooperating with the polyvinyl alcohol and the redispersable rubber powder, water molecules can be absorbed through compounding to form a layer of solvated water film having a certain mechanical strength, so that other raw materials on the surface of the household garbage can be fully hydrated, microcracks are filled through mutual fusion, strong mechanical anchorage is also formed between household garbage and other substrates, accordingly the interface bonding strength is improved, and further the strength of green bricks is improved.

Description

technical field [0001] The invention relates to the technical field of sintered bricks, in particular to a microporous sintered brick in which redispersible rubber powder improves interfacial bonding. Background technique [0002] As the third largest country in the world, China has abundant clay resources. However, with the increasing population of our country and the further development of the construction industry, the contradiction of relatively insufficient land resources in our country has become increasingly prominent. According to statistics, my country's per capita The area of ​​arable land is less than 43% of the world average level, so we are facing the heavy pressure of insufficient land resources. In order to solve the problem of insufficient arable land per capita, clay solid bricks are gradually banned and eliminated, and coal gangue and shale will become As the main raw material for sintered bricks, coal gangue is widely used to make bricks in most mining areas...

AI Technical Summary

Problems solved by technology

However, due to the use of rice husk as a porogen, a large amount of water is lost during the sintering process of the brick body, forming larger pores, and the pores are continuously compressed during the densification process, and the firing shrinkage increases. During the firing process, with the continuous escape of water and volatile matter, larger voids are formed in the body, and interpenetrating pores are continuously formed during the outward migration of volatile matter, resulting in its In the case of the same porosity, the water absorption rate is high, and the impermeability decreases, which requires modification; the present invention adds dried sludge as the main component of fired bricks, although the water content of the dried sludge is already very low , but the drying of sludge is a process of water evaporation, and the hydrogen sulfide and ammonia molecules in the raw materials will also evaporate, which will cause odor pollution to the factory and the surrounding environment, and have a serious impact on people's work and daily life