硫酸盐侵蚀-冻融循环复合作用下混凝土材料耐久性研究  

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

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

机构地区：[1]华北水利水电大学水资源高效利用与保障工程河南省协同创新中心,河南郑州450011

出　　处：《混凝土》2017年第6期21-23,27,共4页Concrete

基　　金：国家自然科学基金资助项目(51279064;31360204);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：针对我国西北寒旱地区水工混凝土结构长期遭受冻融及盐离子腐蚀等侵蚀破坏造成混凝土结构耐久性衰减问题,结合工程实际采用理论分析与室内加速试验相结合的方法开展硫酸盐侵蚀-冻融循环复合作用下混凝土耐久性试验,探究硫酸盐侵蚀-冻融循环作用下混凝土材料动弹性模量、质量以及抗压强度等耐久性指标变化规律。结果表明:混凝土材料在硫酸盐侵蚀-冻融循环作用下,其动弹性模量、质量以及抗压强度等耐久性指标显著下降,选用水胶比为0.35的混凝土材料能更好地抵抗硫酸盐侵蚀-冻融循环复合作用破坏。试验结果与实际工况相吻合,为硫酸盐侵蚀-冻融循环环境下混凝土材料的耐久性研究提供参考依据。In northwest the cold and arid area of China,the concrete structures have been suffering the long-term erosion impacts of freeze-thaw cycles and salt ion erosion,leading to the attenuation of concrete durability.Bsaed on practical engineering, a study method combining indoor accelerated test and theoretical analysis, was used to conduct the durability of concrete experiment with the complex functions of sulfate attack and freeze-thaw cycles.The experiment researches the change law of concrete durability index including dynamic modulus, quality and compressive strength under the complex functions of sulfate attack and freeze-thaw cycles.The results show that, the concrete durability index including dynamic modulus,quality and compressive strength has decreased significantly under the complex functions of sulfate attack and freeze-thaw cycles.The concrete what water binder ratio is 0.35 can better resist damage of he complex func- tions of sulfate attackand freeze-thaw cycles.The experimental results coincide with actual working conditions.It provides a reference for the study on durability of concrete under the sulfate attack and freeze-thaw cycles environment.

关 键 词：混凝土材料 冻融循环 硫酸盐侵蚀 耐久性研究 

分 类 号：TU528.01[建筑科学—建筑技术科学]