Abstract: To explore the effect of curing humidity on dynamic compressive failure characteristics and energy dissipation of rubber cement mortar, the split Hopkinson pressure bar (SHPB) tests of rubber cement mortar under 95% and 50% relative humidity curing were carried out. The results show that the specific energy absorption value of the specimens is a linear positive correlation with the incident energy and strain rate. Although increasing the rubber content will reduce the specific energy absorption value, it will significantly increase the average fragment size/decrease the fractal dimension. Reducing curing humidity will significantly reduce the specific energy absorption value and decrease the average fragment size/increase the fractal dimension, but with the increase of strain rate, the difference of the average fragment size and fractal dimension under dry and wet curing gradually decreases. When the specific energy absorption value is 1.0, the fragment size/fractal dimension of the specimens in each group has the smallest difference, mainly distributed in 10—25 mm/(1.85—2.20). When the incident energy is 600—800 J, the fragment size and fractal dimension distribution of the specimens are relatively concentrated. By discussing and analyzing the mechanism of the energy dissipation of rubber particles in the sample of the SHPB test, it was proved that rubber cement mortar has good impact cracking resis-tance. Through the discussion and analysis of the different energies accompanied by the experiment, it was explained that at the same incident energy level, due to the addition of rubber particles and the reduction of curing humidity, the reflected energy ratio increases, the transmitted energy ratio and the failure energy ratio decreases.
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2020, Vol. 34 
