标题：Experimental Study of the Effect of RCC Specimen Size and Crack Depth Ratio on Double-K Fracture Parameters
作者：Cui, Xinzhuang; Zhang, Jiong; Hou, Fei; Gao, Zhijun; Wang, Zengtang; Sui, Wei
作者机构：[Cui, Xinzhuang; Zhang, Jiong; Hou, Fei; Gao, Zhijun; Sui, Wei] Shandong Univ, Sch Civil Engn, Jinan 250061, Shandong, Peoples R China.; [Wang, Zeng 更多
通讯作者地址：[Zhang, J]Shandong Univ, Sch Civil Engn, 17922 Jingshi Rd, Jinan 250061, Shandong, Peoples R China.
来源：JOURNAL OF TESTING AND EVALUATION
关键词：wedge splitting test; specimen size; crack depth ratios; double-K; fracture parameters
摘要：When the height of roller compacted concrete (RCC) specimen is less than 400 mm, the specimen size and crack depth ratio will affect the double-K fracture parameters. In this paper, two groups of RCC specimens with different specimen size and crack depth ratio were investigated and the wedge splitting method was employed. Double-K fracture parameters were calculated employing the double-K fracture theory of concrete. It is indicated that when the crack depth ratio, a, increased from 0.4 to 0.6, the unstable fracture toughness, Kun IC, increases, while the initial fracture toughness, Kini IC, decreases. The crack depth ratio, a, has a continuous effect on Kini IC, however the effect on Kun IC decreases with the increase of a. When the height of the specimen, h, is less than 300 mm, the effect of specimen size on Kun IC is significant, but it decreases when h is greater than 300 mm and less than 500 mm.