Journal Published Online: 06 June 2019
Volume 48, Issue 3

Influence of Clinker and SCMs on Soluble Chemicals and Expansion of Phosphogypsum-Based Cementitious Materials

CODEN: JTEVAB

Abstract

This article investigates the effects of the type and content of alkaline materials (AM) on the impurities and expansion of phosphogypsum-based cementitious materials. It is concluded that the selection of AM (clinker, clinker–ground-granulated blast-furnace slag, clinker–fly ash, and clinker-lime) has little effect on the of soluble phosphorus removal rate but has significant influence on the soluble fluorine removal rate (FRR). A higher FRR (74–83 %) is obtained by using clinker–fly ash as the AM compared with groups using other types of AM. In addition, it can be observed that the addition of AM can reduce the expansion rate of mortar. However, as the AM continuously increases, the effect is not significant. In terms of expansion ratio, the optimal amount of AM is approximately 4 % of phosphogypsum by weight. Furthermore, delayed ettringite formation is greatly affected by the temperature and humidity when the elements needed to form ettringite are sufficient.

Author Information

Sun, Tao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China Wuhan University of Technology–University of California Berkeley Joint Laboratory on Concrete Science and Technology, Wuhan University of Technology, Wuhan, China
Hu, Teng
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
Wang, Guiming
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
Shui, Zhonghe
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Ge, Keyu
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Dai, Qiantian
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Xie, Yifan
International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
Pages: 12
Price: $25.00
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Stock #: JTE20190127
ISSN: 0090-3973
DOI: 10.1520/JTE20190127