Performance of soft-hard-soft (SHS) cement based composite subjected to blast loading with consideration of interface properties

Abstract

This paper presents a combined experimental and numerical study on the damage and performance of a soft-hard-soft (SHS) multi-layer cement based composite subjected to blast loading which can be used for protective structures and infrastructures to resist extreme loadings, and the composite consists of three layers of construction materials including asphalt concrete (AC) on the top, high strength concrete (HSC) in the middle, and engineered cementitious composites (ECC) at the bottom. To better characterize the material properties under dynamic loading, interface properties of the composite were investigated through direct shear test and also used to validate the interface model. Strain rate effects of the asphalt concrete were also studied and both compressive and tensile dynamic increase factor (DIF) curves were improved based on split Hopkinson pressure bar (SHPB) test. A full-scale field blast test investigated the blast behavior of the composite materials. The numerical model was established by taking into account the strain rate effect of all concrete materials. Furthermore, the interface properties were also considered into the model. The numerical simulation using nonlinear finite element software LS-DYNA agrees closely with the experimental data. Both the numerical and field blast test indicated that the SHS composite exhibited high resistance against blast loading.

Keywords

high strength concrete (SHS) / engineered cementitious composite / interface / blast test / strain rate effect

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Acknowledgements

This research was supported by Grant No. CN0700 1904 from the Defence Science and Technology Agency (DSTA), Singapore, through the Centre for Protective Technology, National University of Singapore. Part of this research was also sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China (Grant No. E262021514), Youth Teacher Training Scheme from Shanghai Education Committee (Grant No. ZZGCD15053), and foundation from Shanghai University of Engineering Science (Grant No. E10501140170). The assistance of Dr. He Zhiwei and Dr. Tan Hong Wei Andy for the experiment work is appreciated

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg