Study On Fly Ash Foamed Concrete And Its Engineering Application

Fly ash is a kind of industry waste residue, in china the amounts of fly ash is very large and its distributing range is wide, what's more, it pollutes the environment greatly. Because of that, making best use of fly ash is an efficacious measure which can lighten environmental pollution, save energy sources, become waste into useful things and benefit the people. Recently, using solid clay brick is gradually prohibited, so the new wall material is required to fill up the new architecture. Many sections research on this field, using fly ash to develop new building materials is the mostly adopted method, among the new building materials, fly ash foamed concrete is a noticeable one because of its outstanding merits such as light weight, heat preservation, sound insulation and good resisting earthquake. Using fly ash to develop foamed concrete can not only become fly ash into resources, but also provide a new kind of building materials for the innovation of wall materials, which has good economy and society benefits.In this paper, the effects of fly ash, cement, lime, fine sands, foam agent, w/c ratio and additional agent on foamed concrete were studied by experiments, the best combination ratio of fly ash foamed concrete whose density varies from 551kg/m3 to 650kg/m3 was obtained through orthogonal test design, the foam agent quantity and the fly ash quantity effect the fly ash foamed concrete greatly, so the author selected them as independents to establish duality linear regression equations, the equations were quite ideal through the test of model summary R. Moreover, the author also did some experiments about the water resistance of magnesium oxychloride cement fly ash foamed concrete, the outcome showedthat phosphoric acid has good effect on water resistance, and its appropriate quantity was found.The microstructure of fly ash foamed concrete and the water resistance of magnesium oxychloride cement foamed concrete were analysed in virtue of SEM method, at the same time, whose process to hydrate and carbonization resistance were analysed correspondly.The fly ash foamed concrete product line which is suitable for industrialization was designed in this paper and the technics flow was showed, the project of ZHIDA concrete plant belonging to China water and electricity 14th bureau was introduced as an example, the summary is that the industrialization of fly ash foamed concrete can not only be realized, but also creates good economy and society benefits for the enterprises.