EXPERIMENTAL RESEARCH ON BOND BEHAVIORS OF CORRODED REBAR AND ULTRA HIGH TOUGHNESS CEMENTITIOUS COMPOSITES (UHTCC)

J Chin Soc Corr Pro

2012, Vol. 32

Issue (3): 228-234 DOI:

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EXPERIMENTAL RESEARCH ON BOND BEHAVIORS OF CORRODED REBAR AND ULTRA HIGH TOUGHNESS CEMENTITIOUS COMPOSITES (UHTCC)

CAI Xinhua¹ XU Shilang², YIN Shiping³, HE Zhen¹

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,Wuhan 430072
2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058
3. School of Architecture and Civil Engineering, China University of Mining and Technology, Xuzhou 221116

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Abstract Ultra high toughness cementitious composites (UHTCC), featured with its strain hardening characteristic and outstanding crack controlling under tensile conditions, could greatly enhance the durability of reinforced concrete structures and prolong the service life of infrastructures. By means of accelerated corrosion test and direct pulling test, bond properties between corroded rebar with different corrosion ratio(0, 1%, 2%, 3% and 5%) and UHTCC were investigated, did the same for corroded rebar and ordinary concrete while other things being equal. The relationships between average bond stress and end slip with different corrosion ratio were presented. A constitutive model for bond slip relation between rebar and UHTCC was applied for simulating the test results, and fit well. The relationship between maximum average bond stress and corrosion ratio indicated that UHTCC could restrict the corrosion expansion. The maximum average bond stress of rebar and UHTCC increased linearly before corrosion ratio up to 3%, then remained constant till to 5%, while the maximum average bond stress between rebar and concrete decreased rapidly when the corrosion ratio exceeded 2%.

Key words: rebar corrosion ultra high toughness bond behavior bond-slip strain hardening

Received: 18 October 2011

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CAI Xinhua, XU Shilang, YIN Shiping, HE Zhen. EXPERIMENTAL RESEARCH ON BOND BEHAVIORS OF CORRODED REBAR AND ULTRA HIGH TOUGHNESS CEMENTITIOUS COMPOSITES (UHTCC). J Chin Soc Corr Pro, 2012, 32(3): 228-234.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I3/228

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