不同侵蚀溶液耦合冻融作用下混凝土力学性能差异  

Mechanical properties of concrete under different erosion and freeze-thaw cycling

作　　者：张健[1,2] 刁波[1,2] 袭杰[1,2] 李艳东[1,2] 

机构地区：[1]北京航空航天大学土木工程系,北京100191 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《混凝土》2012年第3期4-7,14,共5页Concrete

基　　金：国家自然科学基金(51078015);北京市自然科学基金(8092020);华南理工大学亚热带建筑科学国家重点实验室重点课题资助

摘　　要：以清水、质量分数为5%的硫酸钠溶液、5%硫酸钠+3%氯化钠的混合溶液为侵蚀介质,采用慢冻法及干湿交替环境,对强度为54.71 MPa、水胶比为0.4的高强混凝土进行0、100、200、300次冻融循环,观察各组试件表面剥蚀情况,测定质量损失和抗压强度。试验结果表明:随着冻融循环及侵蚀次数增加,混凝土试块表面剥蚀趋于严重,质量损失率增加,抗压强度减小。侵蚀介质为5%硫酸钠+3%氯化钠溶液的混凝土试件,各参数的变化幅度最大。The mechanical properties of high strength concrete （54.71 MPa at 28 days of age） whose water-cement ratio was 0.4 were experi- mentally investigated under different erosion and freeze-thaw cycling.Three kinds of erosion solutions were water, solution by weight of 5% sodi- um sulfate and solution mixed by weight of 3% sodium chloride and 5% sodium sulfate,respectively.The surface scaled was observed,mass loss and compressive strength of specimens were measured as well.Results showed that,with the increase of freeze-thaw cycles,the surface scaled more seriously, the mass loss rate increased and the compressive strength decreased.The parameters of specimens thawed in mixed solution of 3% sodium chloride and 5% sodium sulfate changed most obviously.

关 键 词：混凝土 慢冻法 冻融循环 溶液侵蚀 抗冻耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]