模拟酸雨环境下C40混凝土抗压性能试验研究  

Experimental Study on Compressive Performance of Concrete C40 in Simulated Acid Environment

作　　者：张英姿[1] 范颖芳[1] 刘江林[1] 曹小祥[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《建筑材料学报》2010年第1期105-110,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50708010);辽宁省博士启动基金资助项目(1050259)

摘　　要：利用实验室加速腐蚀方法模拟了3种pH值(分别为1.5,2.5和3.5)的酸雨环境,将246个C40混凝土棱柱体试块分为3组,分别在3种pH值酸雨溶液中进行侵蚀,并与108个同期未受腐蚀的试件作对比,得到了不同酸雨环境中混凝土腐蚀不同时期的抗压性能(轴心抗压强度、静力受压弹性模量等).结果表明:经模拟酸雨溶液中H+和SO42-的共同腐蚀作用,3组试件的外观、质量等均随时间的延长而发生变化,且其轴心抗压强度和弹性模量在腐蚀初期都有短暂的上升,而随着腐蚀时间的延长,其轴心抗压强度和弹性模量发生明显劣化,且酸性较强的酸雨溶液对混凝土力学性能的劣化促进作用比酸性弱的酸雨溶液更加显著.To investigate compressive performance of concrete corroded in the environment of acid rain,3 kinds of mixed solutions of sulfuric acid and nitric acid with pH of 1.5,2.5 and 3.5 were prepared to simulate the environment of acid rain in the laboratory.Concrete C40 specimens were corroded by the mixed solutions.3 series of accelerated corrosion tests were executed on concrete,including 246 concrete prisms and 108 control prisms specimens.Axial compressive strength,elastic modulus,mass and appearance of the corroded specimens were determined.It is shown that,under combined action of H~＋ and SO^（2-）_4,elastic modulus and axial compressive strength have a significant increase at the initial corrosion stage,however,the compressive performance of the concrete becomes worse with the increasing of corrosion duration,and the higher the concentration of the corrosive solution is,the more severe the specimens is damaged.

关 键 词：混凝土 酸雨 抗压性能 腐蚀 弹性模量 

分 类 号：TU528[建筑科学—建筑技术科学]