Hits:

Indexed by:期刊论文

Date of Publication:2012-01-01

Journal:CONSTRUCTION AND BUILDING MATERIALS

Included Journals:SCIE、EI

Volume:26

Issue:1

Page Number:21-31

ISSN No.:0950-0618

Key Words:Fibre reinforced self compacting high performance concrete (FRSCHPC); High temperature; Residual strength; Flexural toughness; Failure pattern

Abstract:This paper analyzed the effect of different fibres on the residual compressive strength, the ultimate load and flexural toughness, the failure pattern and the fracture energy of self compacting high performance concrete (SCHPC) after exposure to various high temperature. The micro polypropylene fibre (PP fibre) could mitigate the spalling of SCHPC member significantly, but did not show clear effect on the mechanic properties of concrete. The macro steel fibre (SF) reinforced SCHPC showed higher flexural toughness and ultimate load before and after high temperatures. The mechanical properties of hybrid fibre reinforced SCHPC (HFSCHPC) after heating were better than that of mono fibre reinforced SCHPC. The failure mode changed from pull-out of steel fibres at lower temperature to broken down of steel fibres at higher temperature. The use of hybrid fibre can be effective in providing the residual strength and failure pattern and in improving the toughness and fracture energy of SCHPC after high temperature. (C) 2011 Elsevier Ltd. All rights reserved.