活性粉末混凝土断裂性能的试验研究

Experimental Study on Fracture Properties of Reactive Powder Concrete (RPC)

摘要:

采用虚拟裂缝模型结合线弹性断裂力学,分析了掺与不掺纤维活性粉末混凝土(RPC)的断裂特性.结果显示,RPC中掺入钢纤维后,其裂缝的扩展受到限制,而断裂韧度、裂缝尖端亚临界扩展量和裂缝尖端张开位移(CTODc)大大提高,韧性得到显著改善.另外还给出了掺与不掺纤维RPC各断裂参数随纤维掺量的变化规律,分析了其断裂破坏的机理.

Abstract:

The fracture properties of RPC and fibre reinforced RPC are analyzed with Fictitious Crack Model(FCM) in combination with linear-elastic fracture mechanics.The results show that the crack propagation is controlled and the fracture parameters such as fracture toughness,pre-critical propagation length and CTOD_c are greatly influenced by fibre volume fraction in RPC.The paper presents the relationship between fracture parameters and the fibre volume fraction,and probes into its fracture failure mechanism.