WANG Yonggui1, 2, LI Shuaipeng1, HUGHES Peter1, FAN Yuhui1, GAO Xiangyu3
1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. Henan Province Engineering Laboratory for Eco-architecture and the Built Environment, Henan Polytechnic University, Jiaozuo 454000, China;
3. College Architecture and Civil Engineering, Beijing University of Technology, Beijing 100122, China
Abstract：In order to improve the mechanical properties of recycled concrete, basalt fiber and nano-silica are used as the reinforcing materials to improve the recycled concrete to form the composite modified recycled concrete. Through static compressive strength test and split Hopkinson pressure bar test, the influence of basalt fiber and nano-silica on the destruction form and compressive strength of recycled concrete. The results show that, as the strain rate increases, the destruction form transitions from fracture to crushing, and the dynamic compressive strength, dynamic increase factor, and specific energy absorption all increase. The replacement rate has no regular effect on the destruction form, dynamic compressive strength, peak strain and specific energy absorption, but the static compressive strength decreases with the increase of the replacement rate. Basalt fiber is conducive to enhancing the integrity of the specimen during failure, and improves the static compressive strength, dynamic compressive strength, peak strain and specific energy absorption of the recycled concrete. Nano-silica can improve the static compressive strength, dynamic compressive strength, peak strain and specific energy absorption of the recycled concrete. Studies have shown that basalt fiber and nano-silica have a good reinforcement effect on the mechanical properties and energy dissipation of recycled concrete.
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