Laboratory testing of early age bond strength of shotcrete on hard rock |
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| Affiliation: | 1. School of Highway, Chang’an University, Xi’an 710064, China;2. College of Civil and Architecture Engineering, Xi’an Technological University, Xi’an 710032, China;3. School of Civil Engineering, Chang’an University, Xi’an 710061, China;1. Department of Civil Engineering, Kangwon National University, Chuncheon 200-701, South Korea;2. Department of Civil and Environmental Engineering, Gachon University, Seongnam 461-701, South Korea;1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China;2. College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3. National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | This study investigates early age bond strength of shotcrete (sprayed concrete), in the case of shotcrete sprayed on hard rock. Shotcrete differs from ordinary, cast concrete through the application technique and the addition of set accelerators which give immediate stiffening. The bond between shotcrete and rock is one of the most important properties. During the very first time after spraying the physical properties and the bond to the rock depend on the set accelerator and the micro structure that is formed. In this work a laboratory test method for measuring early bond strength for very young or early age shotcrete is presented. The newly developed method was tested and evaluated and proved that it can be used for bond strength testing already from a couple of hours after shotcreting. |
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| Keywords: | Shotcrete Granite Bond strength Compressive strength Pull-out testing Failure modes |
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