Creep in expanded clay concrete at different levels of stress under compression and tension

Abstract

The paper analyzes the results of experimental studies of the creep of light concrete and the influence of various factors on it. A method for determining the boundary of linear creep of expanded clay concrete has been developed. Experimental studies have been carried out to determine the boundary of linear creep. Experimental creep data and the kinetics of the change in the creep measure of expanded clay concrete over time under axial compression at different levels of long–term load (0.2 - 0.7)Rb are obtained. The limiting values of the relative creep deformation and shrinkage of expanded clay concrete are determined. Empirical formulas for determining and describing the relative deformation of the nonlinear creep of expanded clay concrete, measures of the linear creep of expanded clay concrete under axial tension and compression (if there are no direct experimental data), and the nature of the change are proposed λ(t;τ1)═Cbt(t;τ1)/(t;τ1), depending on (t;τ1) according to the linear law at each site, the nature of the influence of previous loading on the strength and modulus of elasticity of concrete, the limit values of the relative creep deformation and shrinkage of expanded clay concrete.