Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 45, Issue -, Pages 306-313Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.04.008
Keywords
Ceramic fiber; Split Hopkinson pressure bar (SHPB); Strain rate effects; Impact toughness; Constitutive model
Categories
Funding
- National Natural Science Foundation of China [51078350]
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Dynamic properties of ceramic fiber reinforced concrete (CRFRC) are investigated using a 100-mm-diameter split Hopkinson pressure bar (SHPB) system. Different ways of choosing strain rate were adopted to express the strain rate effects on dynamic compressive stress, elastic modulus and impact toughness of CRFRC. The results show that the dynamic compressive strength and impact toughness increase with strain rate, while the elastic modulus decrease with strain rate. The addition of ceramic fiber can significantly improve the dynamic strength and elastic modulus of concrete. 0.1% and 0.2% volume fraction of ceramic fiber improve the impact toughness at higher strain rate. And the optimum volume fraction of ceramic fiber is 0.2%. The dynamic damage model was established based on the improved parallel bar, system (IPBS) model. The result reveals that the model can well describe the relation between stress and strain of CRFRC. (C) 2013 Elsevier Ltd. All rights reserved.
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