循环流化床粉煤灰加气混凝土制备研究

利用X射线荧光光谱仪、XRD等检测手段对循环流化床粉煤灰进行化学成分定性和定量分析,然后确定其质量配合比:粉煤灰65%,水泥12%,石灰20%,石膏3%.主要研究了在蒸压养护条件下,不同水料比、不同铝粉添加量、不同无机添加剂硫酸钠、氯化钙添加量对加气混凝土砌块容重和强度的影响,研究发现最佳水料比为0.65,最佳铝粉掺量为0.1%,无机添加剂硫酸钠对加气混凝土砌块的容重和强度影响不大,而添加0.25%的氯化钙比无添加剂条件下强度提高了40%,达到4.55 MPa,容重为900 kg/m3,随着氯化钙量的增加,强度反而下降.

Study on Production of Aerated Concrete by Circulating Fluidized Bed Fly ASH

In this article, chemical compositions of circulating fluidized bed fly ash were gualitative and guantitative analyzed by using X-ray fluorescence spectrometry and X-ray diffraction, then determined the suitable match ratio: fly ash 65%, cement 12%, lime 20%, gypsum 3%. Primarily studied on autoclaved condition, the effects of different amounts of water-binder ratio, AI powder addi-tion, inorganic admixture (sodium sulphate, calcium chloride) addition on volume weight and compression strength. The result show that the best water-binder ratio was 0.65, the best Al powder addition was 0.1%, sodium sulphate was less effect on volume weight and compression strength of aerated concrete, however compare with non-admixture, compression strength raised by 40% while adding 0.25% calcium chloride, it reached 4.55 MPa and 900 kg/m3, with increasing of addition of calcium chloride, the compression strength of aerated concrete decrease.