Study on direct tensile fracture of fully-graded concrete / basalt interface

Abstract

[Objective] Based on the seismic stability analysis of the foundation surface of concrete dam built on bedrock, the experimental study on static and dynamic fracture of fully graded concrete/basalt interface is carried out. [Methods] The tests were conducted in the form of cylindrical composite specimens subjected to direct tension containing preset cracks. Two loading rates were considered in the range of typical strain rates for seismic loading. The load-displacement curves of the specimens were measured, from which the fracture parameters of the full-graded concrete/basalt interface were calculated and the fracture toughness was obtained in combination with numerical simulations. [Results] The results show that the composite specimens under quasi-static loading expanded along the preset cracks, whereas the specimens under dynamic loading were deflected towards the location of the natural diagonal cracks contained in the basalt during expansion. [Conclusion] Compared with the quasi-static loading, the fracture parameters of the composite specimen are all increased. Furthermore, t the fracture parameters of composite specimens under quasi-static loading were significantly reduced compared to fully-concrete. The present study can provide a reference for the fracture properties of the fully-graded concrete/basalt interface under quasi-static and dynamic loading.

Keywords

dynamic direct tensile fracture / fully-graded concrete/basalt interface / displacement extrapolation method / coupled experimental-numerical approach / deformation / concrete / influencing factors