Dynamic Compression Behavior of Ultra-high Performance Cement-based Composite with Hybrid Steel Fiber Reinforcements
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https: //doi. org/10.1007/s11595-020-2336-z
Dynamic Compression Behavior of Ultra-high Performance Cement-based Composite with Hybrid Steel Fiber Reinforcements RONG Zhidan1,2, WANG Yali1,2, WU Shenping1,2
(1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China; 2. Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 21189, China) Abstract: Ultra-high performance cement-based composites (UHPCC) is promising in construction of concrete structures that suffer impact and explosive loads. In this study, a reference UHPCC mixture with no fiber reinforcement and four mixtures with a single type of fiber reinforcement or hybrid fiber reinforcements of straight smooth and end hook type of steel fibers were prepared. Split Hopkinson pressure bar (SHPB) was performed to investigate the dynamic compression behavior of UHPCC and X-CT test and 3D reconstruction technology were used to indicate the failure process of UHPCC under impact loading. Results show that UHPCC with 1% straight smooth fiber and 2% end hook fiber reinforcements demonstrated the best static and dynamic mechanical properties. When the hybrid steel fiber reinforcements are added in the concrete, it may need more impact energy to break the matrix and to pull out the fiber reinforcements, thus, the mixture with hybrid steel fiber reinforcements demonstrates excellent dynamic compressive performance. Key words: ultra-high performance cement-based composite; dynamic compression behavior; hybrid fiber reinforcements; split Hopkinson pressure bar
1 Introduction Since ultra-high performance cement-based composites (UHPCC) have excellent mechanical properties, durability and safety reliability[1-5], UHPCC would be more widely used in super-high-rise structures, hydraulic structures, offshore structures, military and protective structures that suffer impact and explosive loads with high impact velocity[6-8]. However, the expensive raw materials such as high content of silica fume and steel fiber reinforcements, the special curing regimes (heat and autoclave curing) result in high cost, low production efficiency and high energy consumption[9]. Nowadays, a lot of new pozzolanic materials (such as metakaolin, rice rusk ash etc) and hybrid fiber reinforcements are widely used to prepare high performance concrete (UHPC) and UHPCC[10-12]. © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 29, 2019; Accepted: May 18, 2020) RONG Zhidan(戎志丹): Assoc. Prof.; Ph D; E-mail: zdrong@ seu.edu.cn Funded by the National Key Research and Development Program of China (No. 2018YFC0705400), National Natural Science Foundation of China (No. 51678142) and the Fundamental Research Funds for the Central Universities
Research on the mechanical properties of hybrid fiberreinforced UHPCC has drawn a lot of attention, but the dynamic behavior is rarely explored in a statistical sense so far. The split Hopkinson pressure bar (SHPB) dynamic test system is the main
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