Reinforcement of Broken Coal Rock Using Ultrafine Sulfoaluminate Cement–Based Grouting Materials
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 6
Abstract
A composite ultrafine sulfoaluminate cement–based grouting material (U-SAC) at a high water–cement (W/C) ratio was developed to reinforce broken coal rock for the safety of coal mines. The effects of the W/C ratio on the bleeding, bulk density, viscosity, setting behavior, and mechanical strength of U-SAC pastes were investigated. The phase assemblage, microstructure, and micromechanical properties of hardened U-SAC pastes in the crack of broken coal rock were also revealed by multiple technologies. The results indicated that when the W/C ratio was 1.0, the U-SAC pastes flowed well with a low bleeding rate and low viscosity. More importantly, the mixed pastes could harden within 20 min and reach strengths of 12.1, 17.8, 22.3, and 26.2 MPa at ages of 4 h, 3 days, 28 days, and 60 days, respectively. During the hydration process, a high volume of ettringite (AFt) and alumina gel () was rapidly generated, consuming water and filling the pores, which was responsible for the rapid setting and high early strength. Scanning electron microscope and nanoindentation results showed that the U-SAC can fill 8-μm microcracks in broken coal rock and the elastic modulus of the hardened U-SAC paste was 2.39 times higher than that of coal rock. These results provide an inexpensive and effective material for the rapid reinforcement of microcracks in structural engineering.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors appreciate the supports from the National Natural Science Foundation of China (Nos. U1905216, 52108208, and 51808196), the fellowship of the China Postdoctoral Science Foundation (2020M682290), the Science and Technology Project of Henan Province (212102310559), and the Doctor Foundation of Henan Polytechnic University (B2020-11).
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Journal of Materials in Civil Engineering
Volume 34 • Issue 6 • June 2022
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© 2022 American Society of Civil Engineers.
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Received: May 5, 2021
Accepted: Oct 1, 2021
Published online: Mar 17, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 17, 2022
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