高浓盐侵蚀与冻融循环耦合作用下混凝土耐久性劣化规律研究  

Study on Durability Deterioration of Concrete under Coupling Action of High Concentration Salt Attack and Freeze-thaw Cycles

作　　者：楚建勋 贺建国 孙勋 胡晋荣 CHU Jianxun;HE Jianguo;SUN Xun;HU Jinrong(Xinjiang Road and Bridge Construction Group Co.,Ltd.,Urumqi 830063,Xinjiang,China;Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]新疆路桥建设集团有限公司,新疆乌鲁木齐830063 [2]长安大学,陕西西安710064

出　　处：《建筑施工》2024年第10期1592-1595,共4页Building Construction

基　　金：新疆维吾尔自治区交通运输厅行业科技项目(2022-ZD-001)。

摘　　要：通过对比清水冻融与高浓盐侵蚀—冻融耦合作用下混凝土外观变化、质量及动弹性模量的变化,研究了高浓盐侵蚀—冻融耦合作用对混凝土耐久性能的影响及劣化机理。结果表明:相比清水冻融作用,10%(质量分数)Na2SO4侵蚀与冻融循环耦合作用下混凝土在冻融循环前期的劣化速度较为缓慢,但在循环后期劣化速度明显加快,盐蚀—冻融循环作用下,虽然混凝土试样破碎颗粒感较弱,但会产生较为明显的裂缝。By comparing the changes in appearance,mass,and dynamic elastic modulus of concrete under freezing-thawing and high concentration salt erosion-freezing-thawing coupling actions,the influence of high concentration salt erosion-freezing-thawing coupling on the durability of concrete and the deterioration mechanism is studied.The results show that the deterioration rate of concrete under the combined action of 10%(mass fraction)Na2SO4 corrosion and freeze-thaw cycles is slower in the early stages of freeze-thaw cycles,but it significantly accelerates in the later stages.Under the action of salt corrosion-freeze-thaw cycles,although the granular sense of concrete samples is weaker,the cracks are more pronounced.

关 键 词：混凝土 盐蚀—冻融 硫酸盐侵蚀 耐久性能 

分 类 号：TU528[建筑科学—建筑技术科学]