活性粉末混凝土高温后冲击压缩特性研究  

INVESTIGATION OF DYNAMIC COMPRESSION PROPERTIES OF REACTIVE POWDER CONCRETE AFTER EXPOSURE IN HIGH TEMPERATURE

作　　者：王立闻[1] 庞宝君[1] 盖秉政[1] 贾斌[1] 

机构地区：[1]哈尔滨工业大学空间碎片高速撞击研究中心,黑龙江哈尔滨150080

出　　处：《工程力学》2012年第9期245-251,共7页Engineering Mechanics

基　　金：国家空间碎片专题研究基金项目(kjsp06211)

摘　　要：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%。Uniaxial-compression split Hopkinson pressure bar experiments were performed for reactive powder concrete samples. Both the untreated specimens and after-exposure concretes in high temperature （400℃, 600℃ and 800℃） were tested in order to investigate the influences of hybrid fibers on dynamic mechanisms for RPC concrete after exposure in high temperature. The results show that： without burnt, a negative-mixed effect occurs on dynamic compression strength and ductile for hybrid fibers RPC material, but less evidence decreasing rate of ductility than strength. After exposure in high temperature, a positive-mixed effect occurs on dynamic compression strength and ductility. The material shows a better impact resistant and integrity than steel fiber reinforced by RPC. And hybrid RPC behaves a plastic strengthen effect character. The sample with steel fiber of 2.0% volume rate and PVA fiber of 0.1% volume rate shows a optimal dynamic mechanical property.

关 键 词：活性粉末混凝土 分离式霍普金森压杆 混杂纤维 高温过火 抗冲击性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]