硫酸盐侵蚀-冻融循环复合作用下混凝土力学性能研究  

Study on the mechanical property of concrete under the action of sulfate attack and freeze-thaw cycle

作　　者：徐存东[1] 田子荀 谢佳林[1] 程慧[1] 刘璐瑶[1] 王国霞[1] 

机构地区：[1]华北水利水电大学,河南郑州450011

出　　处：《混凝土》2017年第10期1-3,11,共4页Concrete

基　　金：国家自然科学基金资助项目(51579102;51279064);河南省教育厅科技创新人才支持计划(14HASTIT047);河南省高校科技创新团队支持计划(14IRTSTHN028)

摘　　要：针对西北旱寒区混凝土结构在冻融破坏及盐离子侵蚀作用下力学性能不断降低的问题,采用室内循环加速试验和理论分析相结合的方法,依据实际工程情况开展硫酸盐侵蚀-冻融循环复合作用下混凝土力学性能试验,分别考虑引气剂量、粉煤灰掺量及水胶比3个因素,探究硫酸盐侵蚀-冻融循环复合作用下混凝土材料抗压强度指标变化规律。结果表明:引气剂掺量及粉煤灰掺量对力学性能影响较大,水胶比影响较小;加入适量的引气剂和粉煤灰能提高混凝土的抗冻抗侵蚀能力。In the northwest cold and arid area of China, the concrete structures have been suffering the impacts of freeze-thaw cycles failure and salt ion erosion, leading to the declining of concrete mechanical properties.A study was used to conduct the mechanical proper- ties of concrete experiment with the complex functions of sulfate attack and freeze-thaw cycles what method combining indoor accelerated test and theoretical analysisbsaed on practical engineering.The experiment researches the change law of the concrete compressive strength indexunder the complex functions of sulfate attack and freeze-thaw cycles considered three factors including the content of air entrained a- gent,the content of fly ash and water-cement ratio.The results show that,the content of air entraining agent and the content of fly ash have a great influence on the concrete mechanical properties but the water-cement ratio has a little influence.It can improve the ability of con- crete anti-freeze and anti-erosion by adding the right amount of air entrained agdnt and fly ash.

关 键 词：水工混凝土 力学性能研究 冻融循环 硫酸盐侵蚀 

分 类 号：TU528.01[建筑科学—建筑技术科学]