Compression Constitutive Behaviour of Concrete under Coupled Load and Sulfate Attack
In order to study the compression constitutive behaviour of concrete subjected to long-term axial compression of various stress levels in sulfate environment, the uniaxial compression experiments of concrete under coupled loads and sulfate attack at different ages were carried out.The effects of the coupling effects of environmental and mechanical damage factors on the concrete compressive performance were investigated, and the evolution law of stress-strain curves was compared and analyzed.The results show that the variation law of elastic modulus and peak stress of concrete is basically consistent.Under the stress level of 0%, 15% or 30%, the elastic modulus and peak stress increases first and then decrease.While under the stress level of 45% they decrease monotonously.The peak strain shows an increase trend with the increase of erosion time.The high-stress level load accelerates the deterioration of the mechanical properties of concrete, while the lower-stress level load inhibits that, and the stress level threshold is between 30% ~ 45%.The overall change tendency.of concrete compressive stress-strain curve is basically similar under different stress levels, the curve appears flat and the whole moves to the right with the increase of erosion time, and the trend is most obvious when the stress level is 45%.Moreover, through regression analysis, the uniaxial compression stress-strain curve equation of concrete under coupling action of load and sulfate attack was established,and the relationship between the parameter a, b and the erosion time and stress level was obtained.The obtained law can provide reference for calculation of bearing capacity of concrete structures under combined action of load and sulfate attack.
J.Z.Lu L.Q.Tong F.X.Tian L.Z.Tian
School of Civil Engineering, Yantai University-China
国际会议
福州
英文
527-531
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）