Author(s): CHENYanfei, YANGDongsheng, XIELilan, LIYi, HEXin
Pages: 101-103
Year: 2016 Issue:  11
Journal: Concrete
Keyword:  sedimentary fly ash; physical performance; chemical composition; mineral composition; microstructure;
Abstract: With the fast-developing of the fly ash aerated concrete,new fly ash of power plants exceed the supply.Therefore,it is impor-tant to product the aerated concrete by employing the sedimentary fly ash.Physical performance of the sedimentary fly ash used to aerated concrete is analyzed by chemical composition,mineral composition and microstructure.Chemical composition:All of the sedimentary fly ashes in three power plants are low calcium fly ash.Loss of ignitions for sedimentary fly ash in Qing-Zhen Power Plant,Gui-Yang Power Plant and Qian-Xi Power Plant are 10.14%,9.35% and 6.32%,respectively,and the reason is that the sedimentary fly ash is serious damp and causes hydration reaction when long-term stockpiling in the open yard.Mineral composition:It reveals that the mineral composition sedimentary fly ash is the same with ones of the new fly ash by X-ray diffraction.Microstructure:The result of laser scanning confocal mi-croscopy is that particle surface of sedimentary fly ash is uneven,because reaction product is generated on the surface of sedimentary fly ash when the sedimentary fly ash in the rain.