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Deformation behavior of high performance fiber reinforced cementitious composite prepared with asphalt emulsion

Journal of Central South University 2014年第2期21卷 811-816页

作者：何锐陈拴发孙文娟弓锐 Engineering Research Center for Transportation Materials of Ministry of Education (Chang’an University) School of Materials Science and Engineering Chang’an University Guangxi Transportation Research Institute Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University Xi’an Highway Research Institute

A novel engineered cementitious composite(ECC) was prepared with the complex binder of Portland cement and asphalt *** adjusting the amount of asphalt emulsion,different mixture proportions were adopted in experiments,including four-point bending test,compressive test,and scanning electric microscopy(SEM).The SEM observation was conducted to evaluate the contribution of polyvinyl alcohol(PVA) fiber and asphalt emulsion to the composite toughening *** tests results show that the most remarkable deflection-hardening behavior and saturated multiple cracking are achieved when the content of asphalt emulsion is 10%.However,excessive content of asphalt emulsion causes severe damages on the deformation behavior as well as loss in compressive strength of the *** observation indicates that the influence of asphalt emulsion on the fiber/matrix interfacial property changes the dominant fiber failure type from rupture into pull-out mode,and thus causes beneficial effects for strain-hardening behavior.

关键词： toughness deformation behavior engineered cementitious composite asphalt emulsion

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

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Frontiers of Structural and Civil Engineering 2015年第3期9卷 323-340页

作者： Jun WU Xuemei LIU College of Urban Railway Transportation Shanghai University of Engineering Science Shanghai 201620 China Department of Civil and Environmental Engineering National University of Singapore Singapore 119077 Singapore School of Civil Engineering and Built Environment Queensland University of Technology Brisbane QLD 4072 Australia

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 Both the numerical and field blast test indicated that the software LS-DYNA agrees closely with the experimental data SHS composite exhibited high resistance against blast loading

关键词： high strength concrete (SHS) engineered cementitious composite interface blast test strain rate effect

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