Influence of Sub-zero Temperatures on the Dynamic Behaviour of Foam Concrete with Sand

The mechanical properties of foam concrete with sand at different low temperatures and different strain rates were studied. Foam concrete with sand at low temperatures (-10, -20, and -30 degrees C) were tested using a split Hopkinson pressure bar (SHPB) apparatus with different impact pressures (0.15, 0.20, 0.25, 0.30, and 0.35 MPa). The experimental results show that the porosity of sand containing foam concrete with a density of 1,000, 1,200, 1,400 kg/m(3) decreases with increasing density. In the same strain rate range, the lower the temperature of the same density foam concrete with sand, the greater the ultimate compressive strength. The change in strength was caused by the presence of pore water or ice in the foam concrete with sand in low-temperature conditions. The dynamic compressive strength of foam concrete with sand decreases with increasing strain rate. The macroscopic failure of foam concrete was closely related to the energy absorption and dependent on the rate. The total dissipated energy of the low-temperature foam concrete with sand increased linearly as the temperature decreased. The research results provide the low-temperature mechanical properties of foam concrete with sand, which provides a reference for the application of foam concrete with sand.