Strength, Permeability, and Micromechanisms of Industrial Residue Magnesium Oxychloride Cement Solidified Slurry
Publication: International Journal of Geomechanics
Volume 20, Issue 7
Abstract
The solidification of construction waste slurry draws much attention today due to the increasing awareness of environmental protection. Magnesium oxychloride cement (MOC) was first incorporated to solidify slurry in combination with industrial residue, which has the potential to be used as roadbed material. Three types of binding materials including MOC, industrial residue, and industrial residue modified MOC were proposed to evaluate their performance in the solidification of construction slurry with high water content. The unconfined compressive strength (UCS) and coefficient of permeability were investigated, taking into account factors including MOC content, molar ratio of MgO/MgCl2, mass ratio of MOC to industrial residue, industrial residue content, and curing time. The microstructure was identified to reveal the intrinsic mechanisms by scanning electron microscopy (SEM). The results showed that the mechanical behavior of solidified slurry was largely influenced by these factors, and the industrial residue proved effective in improving the strength and permeability of MOC solidified slurry by impeding the decomposition of phase 5 and phase 3 and absorbing a certain amount of water. The industrial residue modified MOC solidified slurry showed higher water resistance and a lower coefficient of permeability due to the generation of amorphous calcium silicate hydrate (C-S-H) gels, phase 5 and phase 3 that could form a much stronger interlocking network.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51879202), Key Basic Research Foundation of the Higher Education Institutions of Henan Province (No. 18B560006), Program for Science and Technology Development of Henan Province (No. 182102310800) and Science and Technology Program of Wuhan (No. 2018060402011257).
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Published In
International Journal of Geomechanics
Volume 20 • Issue 7 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jul 8, 2019
Accepted: Nov 18, 2019
Published online: Apr 22, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 22, 2020
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