%0 Journal Article %A HU Shao-wei %A XIE Jian-feng %A YU Jiang %T Fracture Toughness of Specimen with Different Initial Seam-Height Ratio under Wedge Splitting Test %D 2015 %R 10.3969/j.issn.1001-5485.2015.02.023 %J Journal of Yangtze River Scientific Research Institute %P 114-118 %V 32 %N 2 %X

The effect of initial seam-height ratio on concrete’s fracture performance was researched through wedge splitting test. Four groups including 32 specimens with different initial seam-height ratio were tested. The eigenvalues of parameters and the corresponding process curves of complete load, crack opening displacement and concrete surface strain were determined. Fracture parameters inclusive of effective crack length ac, initial fracture toughness KiniIC and unstable fracture toughness KunIC were calculated based on double-K fracture theory. Results indicate that along with the increase of seam-height ratio, the effective crack length ac increassd and the subcritical crack propagation length Δac reduces; KiniIC is not affected by the initial seam-height ratio, and KunIC increases with the reduction of seam-height ratio, but when a0/D≥0.5, it can be considered as a constant.

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