Study of impact performance of rubber reinforced concrete

This paper reported a study on impact resistant performance of rubber reinforced and rubber/steel-fiber reinforced concrete, which involved the use of selected rubber particles of 0.178 mm, 1.11 mm and 2 mm, and the steel fiber of 30 mm in length and 0.5% in volume fraction. The dynamic performance of the concrete containing the rubber particles with weight fraction of 5%, 10%, 15% and 20% were investigated under the impact loads of 0.2 MPa, 0.3 MPa, 0.4 MPa and 0.5 MPa, respectively. As a result, the stress-strain curves related to the rubber reinforced concrete under different impact loads were obtained and used to reflect the associated strain rate levels. Based on the investigation results, the influence of the strain rates, rubber sizes and rubber contents on the impact resistance of the rubber reinforced concretes were discussed. The methods of determining the parameters of improved Holmquist-Johnson-Cook constitutive model were presented, and the improved Holmquist-Johnson-Cook dynamic constitutive model was obtained. The constitutive model of rubber reinforced concrete was developed and the parameters at different strain rates were suggested correspondingly. (C) 2012 Elsevier Ltd. All rights reserved.