Effects Of Simulated Acid Rain Environment Stress And Strain Rate On Compressive Performance Of Concrete

The concrete structures that are eroded by the acid rain environment will be attacked by H⁺and SO₄^2-plasma in the acid rain,which will directly affect the bearing capacity and durability of the concrete structure.In this study,the compressive performance of concrete under different stress corrosion levels and different strain loading rates under different corrosion days in simulated acid rain environment was studied,and the macroscopic mechanical properties and microstructure changes of the corroded concrete were studied.The specific research content is as follows:1.The influence of different strain rates on the anti-pressure properties of corroded concrete.The main researches are:the appearance change of concrete,the change of mass,the change of strength,the influence of strain rate on strength,the change of stress-strain curve and the depth of neutralization at different corrosion time.Changes and other performance indicators.The results showed that the concrete was seriously damaged by the corrosion of the acid rain solution,and its surface was eroded,and the surface color changed,the corrosion phenomenon,and the leakage of the aggregate occurred.As the corrosion time increases,the concrete quality increases first and then decreases.The compressive strength of concrete increases with the increase of corrosion time and then decreases,but with the increase of strain rate,the compressive strength gradually decreases.As the strain rate increases,the peak stress of the concrete increases and the peak strain decreases.As the corrosion time increases,the neutralization of the concrete increases,but the increasing speed gradually decreases.2.The effect of different stress corrosion levels on the anti-pressure properties of concrete.The main research is to investigate the effect of damage,quality change,strength change,stress level on strength,stress-strain curve change,neutralization depth of loaded concrete under different corrosion time loading stress.Changes and other performance indicators.The results of the study show that the appearance of concrete damage change is the same as that of the unloaded stress concrete surface.The quality of the concrete before and after erosion first decreased,then slightly increased,and finally continued to decrease the law of change.The compressive strength of concrete appears to increase first and then decrease with the increase of corrosion time.The strength loss of high-stress concrete is greater than that of low-stress concrete.As the stress level increases,the peak stress of the concrete decreases and the peak strain increases.The trend of neutral growth of load-stressed concrete and unloaded-stressed concrete is the same,but the degree of neutralization depth of load-stressed concrete is less than that of unstressed concrete.3.The microscopic changes of the corroded concrete,exploring the inherent intrinsic relationship between the microscopic damage and the macroscopic fracture process,found that the change of the macroscopic properties of the concrete is related to the effect of changes in the internal generated material on the concrete internal matrix after erosion by the acid rain solution.