混凝土井壁受盐害侵蚀后的强度损伤试验研究  

Test Research on Strength Damage of Concrete Shaft Lining under Salt Disaster Corrosion

作　　者：李旭绒[1] 纪洪广[1] 王军[2] 宋承霖 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]山东理工大学建筑工程学院,山东淄博255049

出　　处：《金属矿山》2014年第10期157-160,共4页Metal Mine

基　　金：国家重点基础研究发展计划(973计划)项目(编号:2010CB226803);国家高技术研究发展计划(863计划)项目(编号:2008AA062104);国家自然科学基金项目(编号:51034001)

摘　　要：井壁混凝土结构在地下复杂环境中易受复合盐害侵蚀。为了研究混凝土受盐害溶液侵蚀后的抗压强度和抗折强度的变化规律,设计制作了C70标号的高强混凝土试块,配置了3种不同浓度的复合盐害溶液,测定试块经过多次复合盐害溶液浸泡后的抗压强度和抗折强度。试验结果表明:高强井壁混凝土在清水和复合盐害溶液浸泡后,抗压强度和和抗折强度的变化趋势不一样。在清水环境中,两者基本都是上升的趋势,抗压强度在初期其强度上升比较快,到后期逐渐趋于稳定,抗折强度在第6个月到第7个月之间有突变。在复合盐害溶液中,抗压强度和抗折强度整体上符合先增大后减小的变化趋势。腐蚀溶液浓度越大,后期下降的趋势越快。抗折强度的变化规律比抗压强度的变化规律复杂。The structure of concrete shaft lining is easily corroded in underground complex environment.In order to study the change of the compressive strength and the flexural strength after suffering composite salt disaster solutions corrosion,C70 high strength concrete test specimens were prepared and composite salt disaster solutions with three different concentrations were compounded.The compressive strength and the flexural strength of the concrete test specimens were tested after dipping them into mixture solution and drying them for many times.The test results showed that the change laws of the compressive strength and the flexural strength of the high strength concrete are different after dipping them into water and mixture solution.The compressive strength and the flexural strength are increased in the water,and the compressive strength raises faster in the early time but gradually keeps stable in the later time,while the flexural strength changes suddenly from the sixth month to the seventh month.The compressive strength and the flexural strength of high strength concrete increase in corrosion solutions and then decline.The higher corrosion solution concentration is in the mixture solutions,the quicker the strength declines in the later.The change law of the flexural strength is more complex than that of the compressive strength.

关 键 词：高强混凝土 复合盐害 损伤 

分 类 号：TD353[矿业工程—矿井建设]