Bearing capacity of reactive powder concrete reinforced by steel fibers.pdf

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Bearing capacity of reactive powder concrete reinforced by steel fibers.pdf

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Bearing capacity of reactive powder concrete reinforced by steel fibers

Construction and Building Materials 48 (2013) 1179–1186Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier .com/locate /conbui ldmatBearing capacity of reactive powder concrete reinforced by steel fibers0950-0618/$ - see front matter Crown Copyright 2013 Published by Elsevier Ltd. All rights reserved. /10.1016/j.conbuildmat.2013.07.103 ? Corresponding author. Tel.: +86 451 fax: +86 451 E-mail addresses: zhouwei-hit@163.com, eminentmorey@ (W. Zhou).Wei Zhou ?, Haibo Hu, Wenzhong Zheng School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, PR China h i g h l i g h t s Nine SFR-RPC prismatic blocks were tested under local load to emulate anchorage zone. Steel fibers added in RPC mixture improve local bearing capacity and stiffness. Duct weakens local wedge zone of SFR-RPC and decreases of bearing capacity. An equation of SFR-RPC local bearing capacity is proposed.a r t i c l e i n f o Article history: Received 7 January 2013 Received in revised form 19 July 2013 Accepted 25 July 2013 Available online 26 August 2013 Keywords: Steel fiber Reactive powder concrete (RPC) Steel fiber-reinforced reactive powder concrete (SFR-RPC) Bearing capacity Post-tensioned anchorage zone Duct Local pressure Cracking Failurea b s t r a c t Steel fiber-reinforced reactive powder concrete (SFR-RPC) improves the behavior of steel fiber post-ten- sioned anchorage zones by enhancing the fiber’s tensile strength. As part of this study, nine SFR-RPC pris- matic blocks, each with a central longitudinal duct, were subjected to pressure testing to simulate the anchorage zone. The pressure testing results indicate that cracking loads are close to failure loads. Although expansion occurred in the middle of the blocks at failure, integrity was maintained for all of specimens. A local SFR-RPC wedge zone, ahead of the bearing plate, was weakened by a duct. A compar- ison of the SFR-RPC samples, w