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利用分离式霍普金森压杆系统,分别对常温下、400℃、600℃及800℃高温过火后的RPC试样进行单轴冲击压缩实验。研究混杂纤维对高温过火后RPC材料抗冲击性能的影响规律。结果表明:常温下混杂纤维对RPC材料动态抗压强度和韧性均产生负混杂效应,但韧性指标降低幅度没有动态抗压强度明显。高温过火后,混杂纤维RPC材料出现了塑性强化现象,动态抗压强度和韧性增加明显,抗冲击性能及材料完整性均优于单掺钢纤维RPC材料,出现正混杂效应。在研究范围内纤维最优体积掺量为:钢纤维2.0%、PVA纤维0.1%。
The uniaxial impact compression tests were carried out on the RPC samples after being heated at 400 ℃, 600 ℃ and 800 ℃ under normal temperature respectively by using split Hopkinson pressure bar system. The effect of hybrid fiber on the impact resistance of RPC material after overheating was studied. The results show that hybrid fiber has negative mixed effect on the dynamic compressive strength and toughness of RPC at room temperature, but the dynamic compressive strength is not obviously reduced by the ductility index. When the temperature is too high, the hybrid fiber RPC has plastic strengthening phenomena, the dynamic compressive strength and toughness increase obviously, and the impact resistance and material integrity are better than the single-doped steel fiber RPC material, and there is a positive hybrid effect. Within the scope of the study, the optimal volume content of fibers was 2.0% for steel fibers and 0.1% for PVA fibers.