Anchorage Performance of Geopolymer-Grouted Rock Bolts
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 4
Abstract
This study investigated anchorage behavior of geopolymer-grouted rock bolts. Pull-out tests were conducted on rock bolts grouted by geopolymer mortar (GM), geopolymer paste (GP), and cement mortar (CM), respectively. The effect of grout, type of bolts, spacing of bolts, and anchorage depth on anchorage performance was examined. Experimental results have shown that GM achieves better bond than GP and CM under a constant water binder ratio of 0.4. Deformed bolts grouted by GM and GP exhibit a nominal bond strength 2.4 and 1.6 times higher than the plain round ones, respectively. Bolt spacing of more than 150 mm exerts little influence in the anchorage performance. Increasing anchorage depth contributes to both loading capacity and ductility, while reduces nominal bond strength of deformed bolts. The critical anchorage depth ensuring tensile failure of bolts is for both GM-grouted and GP-grouted bolts. GM-grouted deformed bolts with minimum anchorage depth of and bolt spacing of 150 mm are proposed for practical application.
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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 research presented in this paper is supported by Science and Technology Project of Guangdong Communications and Transportation Department (Grant No. Technology-2016-02-008) and Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology (No. 2021B1212040003). All the sources of support are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 4 • April 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 1, 2021
Accepted: Sep 2, 2021
Published online: Jan 22, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 22, 2022
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