Experimental and numerical study on nonlinear basic and drying creep of normal strength concrete under uniaxial compression

The material behavior of concrete is highly nonlinear and time-dependent. In particular, the evolution of deformation due to creep is crucially dependent on the acting stress and the environmental conditions. Numerous experimental campaigns for determining the complex material behavior of concrete in various loading conditions and environmental conditions can be found in the literature. However, the experimental investigation of the time-dependent deformation due to high sustained loading, i.e., nonlinear creep, has received less attention. Especially, the evaluation of the impact of different environmental conditions on nonlinear creep is still pending. In this contribution an experimental study on basic and drying creep under moderate and high uniaxial compression is presented. The experimental results indicate that the nonlinearity of the deformation due to creep in high uniaxial compression is dependent on the environmental conditions. Additionally, the capability of selected constitutive models for representing nonlinear creep is assessed in a numerical study based on the novel experimental results.