基于电通量法的HFRPC抗氯离子渗透性能研究及微观分析

摘要

为了研究混杂纤维活性粉末混凝土（HFRPC）抗氯离子渗透能力，通过在活性粉末混凝土（RPC）体系中混掺或单掺玄武岩纤维、聚丙烯纤维，采用ASTM C1202的电通量法分析研究了纤维对RPC抗氯离子渗透性能的影响。结果表明，单聚丙烯纤维掺量为0.8 kg/m3时，RPC抗氯离子渗透性能最高，混掺纤维RPC的抗氯离子渗透性能低于单掺纤维的RPC，但均高于素混凝土的抗氯离子渗透性能。通过扫描电子显微镜（SEM）从微观上分析了基体内部微细裂纹对RPC抗氯离子渗透性能的影响，证实了基体内部、纤维与基体的黏结界面处微细裂纹为影响RPC抗氯离子渗透性能的关键因素。%In order to study the resistance to chloride ion penetration of the hybrid fiber reactive powder concrete(HFRPC),by mixing with basalt fiber,polypropylene fiber together or single in reactive powder concrete(RPC)system,ASTM C1202 electric flux method is used to study the fiber's impact on RPC ability to resist chloride ion penetration.Result shows that permeability of RPC resistance to chloride ion is the highest when the single polypropylene fiber content is 0.8 kg/m3,penetration resistance mixed with fiber RPC chloride ion will be lower than single doped fiber RPC,but higher than the resistance to chloride ion permeability of concrete.By scanning electron microscope,matrix could be analyzed from the micro internal tiny cracks which will affect the performance of RPC barrier.The matrix inside,the bonding interface of fiber and matrix microcrack are confirmed to be the key factors which influence the RPC chloride ion penetration resistance barrier.