应力作用下受酸雨腐蚀混凝土的力学性能研究

Study of Mechanical Properties of Concrete Corroded by Acid Rain Under Stress

通过配制pH=2.0的模拟酸雨溶液,采用浸泡加速腐蚀的方法,研究了不同压应力水平(28 d抗压强度的15%、20%、25%、30%)作用下混凝土不同腐蚀龄期内的力学性能变化规律。结果表明:在腐蚀初期,试件的质量与抗压强度呈现增加的趋势,而到腐蚀中后期,其质量和抗压强度均逐渐减小;随着应力水平的增加,试件的强度损失和峰值应变增大,而质量损失、峰值应力和吸能能力均减小;应力作用会加速酸雨对混凝土的腐蚀,且应力水平越高,加速腐蚀作用越显著。

By preparing the pH=2.0 simulated acid rain solution and adopting immersion accelerated corrosion method,the change law of mechanical properties of concrete under different compressive stresses(15%,20%,25%,30%of 28 d compressive strength)in different corrosion times was discussed.The results show that the mass and compressive strength of specimens increase in the early stage of corrosion,but decrease gradually in the middle and late stage of corrosion.With the increase of stress level,the strength loss and peak strain of concrete increase,while the mass loss,peak stress and energy absorption capacity decrease.The compressive stress will accelerate the corrosion of acid rain on concrete,and the higher the stress level,the more significant the acceleration effect.