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配置聚苯乙烯(Expanded Polystyrene,EPS)颗粒体积掺量分别为10%,20%,30%,40%,50%的EPS混凝土,采用Φ100 mm分离式霍普金森压杆(SHPB)试验装置,以动态抗压强度和临界应变为指标,研究EPS混凝土在冲击荷载作用下的动态性能,探索EPS颗粒对混凝土动态性能的改善机理。结果表明:由于应变率效应,相同体积掺量的EPS混凝土动态抗压强度与临界应变随应变率的增加而提高,具有显著的应变率相关性;以临界应变为变形性能指标,由于EPS颗粒的微结构效应,在EPS颗粒体积掺量0～40%范围内,其变形性能随EPS体积掺量的增加而提高,当EPS颗粒体积掺量达到50%时,其变形能力有所降低。EPS颗粒体积掺量为40%时对混凝土变形性能的改善效果最佳。
The EPS concrete with 10%, 20%, 30%, 40% and 50% of the volume fraction of expanded polystyrene (EPS) was designed. The Φ100 mm split Hopkinson pressure bar (SHPB) Taking dynamic compressive strength and critical strain as indexes, the dynamic performance of EPS concrete under impact load was studied, and the improvement mechanism of EPS particles on dynamic properties of concrete was explored. The results show that due to the strain rate effect, the dynamic compressive strength and critical strain of the same volumetric content of EPS concrete increase with the increase of strain rate, and have significant strain rate dependence. With the critical strain as the deformation performance index, The microstructure effect of the EPS particles increases with the increase of the volume fraction of EPS in the range of 0-40% of the volume fraction of EPS particles. When the volume fraction of EPS particles reaches 50%, its deformation capacity decreases. When EPS content is 40%, the deformation effect of concrete is best.