Experimental Investigation of the Compressive Behavior of RCC under High Strain Rates: Considering the Rolling Technique and Layered Structure

Roller-compacted concrete (RCC) is widely used in civil engineering, and its compressive behavior is commonly agreed to be affected by thin layers and the vibration rolling technique, which is different from conventional concrete, especially under high strain rates. However, experiments on RCC material under intermediate to high strain rates are relatively limited. In this paper, new empirical relations are proposed for dynamic compressive parameters of RCC specimens based on testing data via phi 100-mm split Hopkinson pressure bar (SHPB). Additionally, the damage patterns under different strain rates are described, and strain-rate sensitivity, aggregate-grade effects, and size effects are tested and analyzed. The results indicate that heterogeneity and thin layers in the specimen composites play apparent roles in the dynamic compressive characteristics of RCC material. The stress-strain curve of RCC has a plateau at approximately +/- 30% of the critical strain, and the dynamic compressive strength, critical strain, and specific energy absorption (SEA) all increase with increasing strain rate, indicating fine ductility and effective energy absorption compared with conventional concrete.