Research on the relative stable time and stable value of concrete creep

The safety coefficients of structures change due to the creep behavior of concrete, which causes increased deformation and cracks in structures, redistribution of internal stresses, and the loss of prestress. It is an important and significant problem to determine when concrete creep is stable and how much of the creep will occur once it is stable over the projected life of the structure. The relationship between compressive concrete creep and time was obtained during creep experiments, which were conducted using the compressive concrete cube with stress levels of 0.160, 0.261, 0.370, 0.470, 0.568, and 0.668, a loading age of 126 days, and a time under loading of 589 days. The creep compliance function model of linear and non-linear compressive concrete creep under stress levels lower than 0.8 was unified by introducing a creep compliance function amplification coefficient A_J. Relative stable time and relative stable value of concrete creep, with different stress levels, were obtained according to the creep model and regular relative stable time.