Uniaxial Compressive Damage Comparison of Concrete under Sulfate Salt and Dry-Wet Cycles,Freeze-Thaw Cycles
In order to study the damage characteristics of concrete under typical service environment in Ningxia,common action and coupled action of three factors,such as sodium sulfate,dry-wet cycle and freeze-thaw cycle were used to investigate different stress-strain curves of concrete uniaxial compressive.Mass loss rate,relative dynamic elastic modulus and stress-strain curves of samples under different concentrations of sodium sulfate solution and different corrosion times were measured.The results show that with the increase of corrosion times,the mass loss rate and relative dynamic elastic modulus of coupled action increase first and then decrease,and that of the common action gradually decreases.With the increase of the concentration of sodium sulfate solution,the slopes of upward section of stress-strain curves of samples under the two corrosion systems are gradually decreasing,and the peak stress is gradually decreasing,as a result,the common action deteriorates more than coupled action.With the increase of corrosion times,the slope of rising section of stress-strain curve of specimen under both corrosion regimes decreases gradually,and the peak stress under the coupled action increases first and then decreases,that under the common action gradually decreases.The peak strain under both corrosion systems increases gradually,and the common action deteriorates faster than the coupled action.The prediction models of concrete stress-strain curve under two corrosion systems are established,which can provide a basis for the life prediction of concrete structure under service environment in Ningxia.
sodium sulfatedry-wet cyclefreeze-thaw cyclecommon actioncoupled actionstress-strain prediction model
万方数据
维普
