Long Guangcheng

Dynamic mechanical properties of CRTS II type CA mortar for high-speed railway based on SHPB test

Dynamic mechanical properties of CRTS II type cement and asphalt mortar (CA mortar) for high-speed railway was studied by split Hopkinson pressure bar (SHPB), and the corresponding dynamic constitutive model was established in present paper. The experimental results show that the peak strength of CA mortar increases gradually with the increasing of strain-rate. However, the increasing rate of peak strength of CA mortar deceases with the further increasing of strain-rate. The increasing rate of peak strength is 52.28% for the strain-rate ranging from 44.17 s-1 to 54.79 s-1 and 7.5% for the strain-rate from 54.79 s-1 up to 108.47 s-1, respectively. The dynamic Youngs modulus of CA mortar increases by 3~25 times of initial value in this investigated strain-rate. The larger the strain rate is, the more serious the cracking is when CA mortar specimen damaged. The specific energy absorption of CA mortar increases with the increase of strain rate. The fitting curves of the established dynamic constitutive model agree well the experimental curves.