摘要
To investigate the influence of dynamic loading and freeze-thaw cycles(F-T)on the energy evolution and damage characteristics of multi-walled carbon nanotubes(MWCNTs)reinforced concrete specimens,impact compression tests were conducted.These tests used a split-Hopkinson pressure bar(SHPB)apparatus with a diameter of 50 mm and were performed on MWCNTs concrete samples that had undergone different numbers of F-T cycles.The impact pressures applied were 0.40,0.50,and 0.60 MPa,respectively.The effects of impact pressure and F-T number on the fractal dimension(D_(f))of the fractured blocks and absorbed energy(W_s)of MWCNTs concrete were investigated.The results indicate that the D_(f) of the fractured blocks in MWCNTs concrete increases with the increase of impact pressure and F-T number,and under the same experimental conditions,the D_(f) of MWCNTs concrete is lower than that of ordinary concrete.The variation in W_s is different:the W_s of MWCNTs concrete under impact load increases with increasing impact pressure but decreases with increasing F-T number.Additionally,under the same experimental conditions,the W_s of MWCNTs concrete is greater than that of ordinary concrete.The incorporation of MWCNTs significantly enhances the impact resistance of the concrete.
基金
Funded by the Gansu Provincial Key Research and Development Plan-Industrial Project(No.25YFGA029)。
