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, α, increased from 0.4 to 0.6, the unstable fracture toughness, KICun, increases, while the initial fracture toughness, KICini, decreases. The crack depth ratio, α, has a continuous effect on KICini, however the effect on KICun decreases with the increase of α. When the height of the specimen, h, is less than 300 mm, the effect of specimen size on KICun is significant, but it decreases when h is greater than 300 mm and less than 500 mm.
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