Static and Dynamic Behaviors of Basalt Fiber Reinforced Cement-Soil after Freeze-Thaw Cycle

摘要

This study investigated the effects of freeze-thaw (f/t) cycles on the static and dynamic behaviors of plain cement-soil (PCS) sample and basalt fiber reinforced cement-soil (BRCS), with a series of laboratory experiments like split Hopkinson pressure bar (SHPB), unconfined compression strength test (UCT), and ultrasonic pulse velocity testing. The results showed that the incorporation of basalt fibers improved the wave velocity, unconfined compression strength (UCS), and dynamic compression strength (DCS), absorption energy (W_s) of cement-soil sample with f/t cycle. The UCS/DCS strength degradation was serious for both BRCS and PCS samples with 1 and 3 f/t cycle, after which the strength decreased slowly. With the strain rate increased from 150 s~(-1) to 190 s~(-1), the strength growth of BRCS against PCS gradually slowed down. Under different f/t cycle conditions, both power relationship and exponential relationship fitted well with the experimental data of wave velocity and UCS/DCS for the DCS of samples, but the UCS seems to be only suitable for the power relationship. The incorporation of basalt fibers changed the energy absorption mode of the sample under impact load and there was a positive correlation between the DCS and W_s.