Mechanical Properties of Polymer Reinforced Concrete at High Strain Rate and Analysis of Its Micro-mechanism

In order to expand the application range of polymer reinforced concrete (PRC) and explore the effect of polymer on the impact resistance of concrete, the dynamic compression test on PRC with polymer content (by volume) of 0, 4%, 8% and 12% was carried out. The effects of polymer content and strain rate on the mechanical properties of PRC were studied, and relevant micro-mechanism was analyzed by SEM and MIP tests. The results show that the polymer can improve the dynamic mechanical properties of concrete, and the dynamic mechanical properties of PRC with polymer content of 4% is the best. With the increase of polymer content, the peak strain of PRC increases, the dynamic compressive strength of PRC first increases and then decreases, and the fractal dimension of fragments of PRC first decreases and then increases. The impact toughness of PRC is larger than that of plain concrete, and the impact toughness of PRC with polymer content of 4% is the maximum. Polymer can improve the interfacial transition zone of concrete through filling and bridging, and optimize the pore structure of concrete, thus improving the mechanical properties of concrete at high strain rate. Polymer can be used to improve the impact resistance of concrete.