Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 30, Issue 4, Pages 752-757Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-015-1223-5
Keywords
split Hopkinson press bar (SHPB); steel fiber; reactive powder concrete (RPC); impact compression
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Funding
- National Natural Science Foundation of China [51478128, 51278135, 50708022]
- Scientific and Research Developing Project of Ministry of Housing and Urban-Rural Development of China [2010-K3-27]
- Guangzhou Government Higher Vocational Colleges & Schools Yang Cheng Scholar Funded Scheme [10A043G]
- Foundation for Fostering the Scientific and Technical Innovation of Guangzhou University
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The impact behaviour of three types of reactive powder concretes (RPC) was studied using the split Hopkinson press bar (SHPB) testing method. These RPC were prepared with steel fiber volume fraction of 0%, 3%, and 4%, respectively. The stress-strain relationship, strain rate sensitivity threshold value, dynamic strength increase factor, modulus of elasticity and failure pattern of these RPC specimens subjected to impact load were investigated. From the tests, the strain rate sensitivity threshold value of 50 s(-1) was obtained. The experimental results showed that when the strain rate increased from the threshold value to 95 s(-1), the maximum stress of RPC increased by about 20% and the modulus of elasticity of RPC increased by about 30%. The failure pattern of RPC specimens with steel fiber reinforcement was very different from that of the RPC matrix specimen when subjected to impact loading. Under similar impact loading rate, cracks developed in the steel fiber reinforced RPC specimens, whilst the RPC matrix specimens were broken into small pieces.
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