期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 47, 期 -, 页码 419-430出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.05.063
关键词
Cement-based materials; Dynamic loading; Kolsky's bar; Strength
资金
- National Natural Science Foundation of China [51178162]
- Fundamental Research Funds for the Central Universities [2011B11047]
Understanding the strain rate effects on cement-based materials are important for accurately modeling concrete structure damage to high-velocity impact and blast loads. This paper reports experimental results of the strain rate effect on paste, mortar and concrete. A pulse-shaped split Hopkinson pressure bar (SHPB) was employed to determine the dynamic compressive mechanical responses and failure behavior of paste, mortar and concrete under valid dynamic testing conditions. Quasi-static experiments were conducted to study material strain rate sensitivity. Strain rate sensitivity of the materials is measured in terms of the stress-strain curve, elastic modulus, compressive strength and critical strain at peak stress. Empirical relations of dynamic increase factor (DIF) for the material properties are derived and presented. A compressive constitutive model with strain rate and damage effects was modified to accurately describe the dynamic compressive stress-strain curves of the materials. (C) 2013 Elsevier Ltd. All rights reserved.
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