Pozzolanic Reactivity and Hydration Products of Epidote

Chao Ren; Keqing Li; Wen Ni; Biyao Geng; Xiaowei Cui; Jiajia Wang

doi:10.18311/jmmf/2017/26970

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Authors

Chao Ren
University of Science and Technology Beijing, Beijing 100 083 ,CN
Keqing Li
University of Science and Technology Beijing, Beijing 100 083 ,CN
Wen Ni
University of Science and Technology Beijing, Beijing 100 083 ,CN
Biyao Geng
University of Science and Technology Beijing, Beijing 100 083 ,CN
Xiaowei Cui
University of Science and Technology Beijing, Beijing 100 083 ,CN
Jiajia Wang
University of Science and Technology Beijing, Beijing 100 083 ,CN

DOI:

https://doi.org/10.18311/jmmf/2017/26970

Keywords:

Epidote, Pozzolanic Reactivity, C-S-H Gel, Ettringite.

Abstract

The pozzolanic reactivity test was carried out on the finely ground powder of epidote. First, 91% of finely ground powder of epidote, 3% of natural gypsum and 6% of calcium hydroxide were mixed together, then during slurrying, 0.3% of PC water reducing agent was added and at last a neat paste test specimen was made at a water-binder ratio of 0.2. XRD, SEM, IR and DSC analysis was carried out on the hydration products of the neat paste specimen. According to the results, the neat paste specimen of finely ground epidote had a compressive strength of 5.50MPa, 6.039MPa and 6.27MPa at the age of 3d, 7d and 28d, respectively, which shows that the finely ground epidote has pozzolanic reactivity. Hydration products mainly include C-S-H gel and ettringite.