The Research Of The Fly-ash Physicochemical Property And The Fly-ash Preparation Permeable Bricks

The fly-ashes are by-products of the coal-fired electric plant .The lots of fly-ash cause huge pressure on environment and Economy. So the society always pays attention to this utilization of fly-ashes. But it is very difficult because the chemical properties of fly-ashes are different. Permeable brick is one of new green environmental protection building materials. It has good properties of water-retention and water-Permeability. And it can solve the environmental problem. Using fly-ashes making permeable bricks is a new path, which has high Environmental protection effect.For this , six fly-ash samples from 5 power plants in Guizhou Province were studied Chemical properties and surface modification by SEM, XRD.On this foundation, the research of the fly-ash preparation Permeable brick was carried on.The main results were showed as follows:Above fly-ashes were low calcium .The Ti element percent is lower compared with the country's percent and the P element is not founded.the mineralogy of fly-ashes was dominated mainly by mullite, quartz. Granule apperence was dominated mainly by the floating balk carbon grainan and etc. The samples of fly-ashes' granule apperence were very different.Using fly-ashes as main raw materials could make permeable brick, it's compression strength osmotic coefficient, WHC could attend Chinese Standand JC/T945-2005. The compression strength and osmotic coefficient of the permeable bricks were antinomies relation, which were affected by shaping pressure sintering temperature aggregate size. As shaping pressure sintering temperature and aggregate size increased, compression strength higher and osmotic coefficient lower.