摘要
本文提出了一种称为表面改性粉煤灰的制备方法,阐述了粉煤灰表面改性的工艺原理,研究了表面改性粉煤灰的矿物组成和胶凝性质,认为这种粉煤灰的特点是,其颗粒外层为水硬性矿物β-C_3S和C_(11)A_2·CaX_2所覆盖,而其核心仍是无定形铝硅玻璃体,它既可作为一种胶结材料,又是一种活性很高的水泥混合材,兼有一定的早期强度和后期强度。
A new method of utilizing fly ash is presented in this paper. A mixture of fly ash and limestone powder is heated at 960℃ in the presence of CaX_2-CaSO_4 (here X is F or Cl) mineralizers. In the process, a newly formed lime is combined with fly ash and a coating is formed on the fly ash surface. XRD and SEM analyses indicate that this coating is mainly composed of tiny β-C_3S and C_(11)A_7.CaX_2. Because of the surface reconstruction of fly ash and retention of some of its features such as shape, fineness and grading in the process, it is therefore considered by the author that the surface of fly ash has been denatured. This denatured fly ash has its own structural characteristics. The outer layer of DFA is covered by cementitious materials and its core remains originally as alumina silicate glass. Consequently it plays the role both as a binder and a pozzolan and it possesses adequate strength during both early and long ages.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1989年第1期82-87,共6页
Journal of The Chinese Ceramic Society
关键词
粉煤灰
表面改性
水泥
水硬活性
fly ash
mineralizer
hydraulicity
surface reconstruction
