碳酸盐侵蚀-冻融循环条件下混凝土抗压性能试验研究  

Experimental study on the compressive property of concrete under CO_(3)^(2-)attacks and freeze-thaw cycles

作　　者：刘佳奇 王伯昕[1] 汪飞[1] LIU Jiaqi;WANG Boxin;WANG Fei(College of Construction Engineering,Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学建设工程学院,吉林长春130021

出　　处：《混凝土》2021年第11期21-23,28,共4页Concrete

基　　金：国家自然科学基金项目(42072296,41627801);冻土工程国家重点实验室开放基金(SKLFSE201514)。

摘　　要：在吉林西部盐渍土地区,混凝土结构同时遭受冻融循环破坏及盐类侵蚀,严重影响了结构的服役性能。为了探究苏打盐渍土地区混凝土抗压性能劣化规律,对混凝土试件进行了5%Na_(2)CO_(3)溶液侵蚀试验及快速冻融循环试验。结果表明:在CO_(3)^(2-)溶液侵蚀及冻融循环耦合作用下,会明显降低混凝土抗压强度,加剧混凝土损伤。建立了CO_(3)^(2-)溶液侵蚀与冻融循环耦合作用下混凝土抗压强度的损伤演化方程,与试验结果吻合较好。In the saline soil area in the west of Jilin Province,the concrete structure is subjected to both freeze-thaw cycles and salt erosion,which seriously affects the service performance of the structure.In order to study the deterioration law of concrete compressive property in saline soil area,tests of 5%Na_(2)CO_(3) solution attacks and rapid freeze-thaw cycles were carried out on concrete specimens.The results show that the compressive strength of concrete will be significantly reduced and the damage of concrete will be aggravated under the coupling effects of CO_(3)^(2-) solution attacks and freeze-thaw cycles.Meanwhile,the damage evolution equation of concrete compressive strength under the coupling action of CO_(3)^(2-) solution erosion and freeze-thaw cycle is established,which is in good agreement with the experimental results.

关 键 词：混凝土 抗压性能 Na_(2)CO_(3)溶液侵蚀 冻融循环 损伤 

分 类 号：TU528.01[建筑科学—建筑技术科学]