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Clays and Clay Minerals

, Volume 67, Issue 3, pp 209–216 | Cite as

EFFECT OF MECHANICAL ACTIVATION ON THE POZZOLANIC ACTIVITY OF MUSCOVITE

  • Geng Yao
  • Haoyu Zang
  • Junxiang Wang
  • Peng Wu
  • Jun Qiu
  • Xianjun LyuEmail author
Article
  • 24 Downloads

Abstract

In order to provide a theoretical foundation for the utilization of tailings as supplementary cementitious materials, the pozzolanic activity of muscovite—a typical mineral phase in tailings—before and after mechanical activation was investigated. In this study, significant pozzolanic activity of muscovite was obtained as a result of the structural and morphological changes that were induced by mechanical activation. The activated muscovite that was obtained after mechanical activation for 160 min satisfies the requirements for use as an active supplementary cementitious material, and the main characteristics of the pozzolana were as follows: median particle size (D50) of 11.7 μm, BET specific surface area of 28.82 m2 g−1, relative crystallinity of 14.99%, and pozzolanic activity index of 94.36%. Continuous grinding led to a gradual reduction in the relative crystallinity and an increase in the pozzolanic activity index due to the dehydroxylation reaction induced by mechanical activation, which occurred despite the fact that the specific surface area showed a decreasing trend when the grinding time was prolonged. Mechanically activated muscovite exhibited the capacity to react with calcium hydroxide to form calcium silicate hydrate, which is a typical characteristic of pozzolana. This experimental study provided a theoretical basis for evaluating the pozzolanic activity of muscovite using mechanical activation.

Keywords

Mechanical activation Muscovite Pozzolanic activity Supplementary Cementitious Material 

Notes

ACKNOWLEDGMENTS

This work was supported by the National Natural Science Foundation of China (nos. 51674161 and 50774050) and the Major Program of the Shandong Province Natural Science Foundation (no. ZR2017ZC0735).

Compliance with ethical standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Clay Minerals Society 2019

Authors and Affiliations

  1. 1.College of Chemical and Environmental EngineeringShandong University of Science and TechnologyQingdaoChina

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