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The Effects of Nano-Silica Additions on the Local Bond of Ultra High Performance Concrete and Steel Reinforcing Bar

Ahad Amini Pishro and Xiong Feng
Western China Earthquake and Hazards Mitigation Research Center, College of Architecture and Environment, Sichuan University, China
Abstract—Micro-silica is widely used as an additive to cement in producing high performance concrete. This matter is used to enhance the strength and efficiency of concrete. Recently, due to the development of advanced nano-technology, nano-silica has been produced with particle sizes smaller than micro-silica and higher pozzolanic activity. Studies show that addition of nano-silica into cement-based materials improves their mechanical properties. Considering the unique characteristics of nanosilica, it seems that this material can be used in ultra-high performance concrete (UHPC). Therefore, further studies are needed on how the local bond and bond stress of steel reinforcing bar and UHPC containing nano-silica would be effected. In the present study, after preparing the mix designs and proposed specimens, the effects of various parameters on the local bond of steel reinforcing bars and UHPC containing nano-silica were examined by pullout experiments. Then four of the specimens were analyzed by a finite element software, ABAQUS.

Index Terms—ultra-high performance concrete, nano-silica, local bond, bond stress, pullout experiment

Cite: Ahad Amini Pishro and Xiong Feng, "The Effects of Nano-Silica Additions on the Local Bond of Ultra High Performance Concrete and Steel Reinforcing Bar," International Journal of Structural and Civil Engineering Research, Vol. 7, No. 2, pp. 99-106, May 2018. doi: 10.18178/ijscer.7.2.99-106
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