硫酸盐侵蚀-冻融循环复合作用下混凝土材料耐久性研究

发布时间：2018-05-06 14:50

本文选题：混凝土材料 + 冻融循环　；参考：《混凝土》2017年06期

【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。
[Abstract]:Aiming at the problem of durability attenuation of concrete structure caused by long-term erosion such as freeze-thaw and salt ion corrosion in the cold and dry area of northwest China, the problem of durability attenuation of concrete structure is discussed in this paper. The concrete durability test under the combined action of sulfate erosion and freeze-thaw cycle is carried out by combining theoretical analysis with indoor accelerated test in combination with engineering practice. The dynamic elastic modulus of concrete under the action of sulfate erosion and freeze-thaw cycle is explored. Quality and compressive strength and other durability index changes. The results show that the durability indexes such as dynamic modulus of elasticity, mass and compressive strength of concrete materials decreased significantly under the action of sulphate erosion and freeze-thaw cycle. The concrete material with water-binder ratio of 0.35 can better resist the combined damage of sulfate erosion and freeze-thaw cycle. The experimental results are in agreement with the actual working conditions, which provides a reference for the durability study of concrete materials under sulphate erosion-freeze-thaw cycle environment.
【作者单位】：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;
【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)
【分类号】：TV431

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