Experimental study on dynamic splitting of recycled concrete using SHPB
1 Ministry of Education Key Laboratory of Technology for Manufacturing Process, Southwest University of Science and Technology, 621010 Mianyang, Sichuan, China
2 College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, PR China
a Corresponding author: email@example.com
Published online: 7 September 2015
To study the recycled concrete splitting tensile properties and fracture state with various recycled coarse aggregate replacement percentage (i.e. 0%, 25%, 50%, 75% and 100%), the dynamic splitting test of recycled concrete was carried out using large diameter (75 mm) split Hopkinson pressure bar (SHPB). The results show that the recycled concrete splitting tensile strength increases with the increase of loading rate, and the loading rate also affects the recycled concrete fracture state, which indicates that the recycled concrete has obvious rate sensitivity. The damage state of the recycled concrete is not only the destruction of the interface between coarse aggregate and cement mortar, but also associates with the fracture damage of aggregates. Under the same water cement ratio, when the replacement percentage of coarse aggregates is around 50%–75%, the gradation of natural and recycled coarse aggregate is optimal, and thus the splitting tensile strength is the largest. This study offers theoretical basis for the engineering applications of recycled concrete.
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