Journal Published Online: 22 August 2019
Volume 48, Issue 3

Comparison of Hydration of Thermally Activated Water-Washed Kaolins in Cement Mortar

CODEN: JTEVAB

Abstract

This article investigated the hydration process, mechanical properties, and pore distribution of two kinds of thermally activated water-washed kaolin in cement-based materials. The metakaolin was obtained through the calcination process at 600°C–700°C for 3 h, and its pozzolanic activity was evaluated using the X-ray diffraction analysis of metakaolin-lime blends. The results indicated that the well-crystallized kaolinite in Maoming, China, had a higher pozzolanic activity than the poorly crystallized kaolinite from Beihai, China, when calcined at the same temperature. The highest pozzolanic activity was observed during the calcination at 650°C, which also indicated a turning point for the specific surface area and the particle size distribution of both kaolins. Furthermore, when mixed at a replacement level of 10 wt%, the metakaolin in Maoming showed the promotion of the hydration of cement to a greater extent, an effective reduction in harmful voids (>20 nm), and a higher compressive strength (i.e., an increase by 120–140 %).

Author Information

Wang, Guiming
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 China Railway Group, Ltd., Wuhan Bridge Science Research Institute Co. Ltd., Wuhan, China
Sun, Tao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China Wuhan University of Technology–University of Cailfornia Berkeley Joint Laboratory on Concrete Science and Technology, Wuhan University of Technology, Wuhan, China
Shui, Zhonghe
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Hu, Teng
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Jiang, He
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China
Wang, Ziyan
International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
Pages: 13
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Stock #: JTE20190128
ISSN: 0090-3973
DOI: 10.1520/JTE20190128