西南交通大学学报2026，Vol.61Issue(1)：41-51,11.DOI:10.3969/j.issn.0258-2724.20240058
高温-干湿循环作用下混凝土分区抗硫酸盐的侵蚀性能
Resistance against Sulfate Erosion of Concrete Partition Under High Temperature and Dry-Wet Cycle
摘要
Abstract
To address the damage and deterioration of concrete materials in a sulfate environment in marine engineering,a concrete erosion test and microscopic test under different concentrations of sulfate solution and high temperature in the semi-immersed environment were carried out.By analyzing the mass change,dynamic elastic modulus,composition and content of eroded products,and sulfate ion content of concrete specimens and conducting the microscopic test,the damage and deterioration law of concrete under the high temperature and dry-wet cycle in semi-immersed and sulfate environment was revealed.The results show that in the early stage of sulfate erosion,sulfate invades the interior of concrete in the immersion zone and promotes hydration.The ettringite(AFT)and gypsum inside the concrete fill the initial gap,and the products play a filling and skeleton role.However,the continuous increase of the product amount in the later stage causes damage to the concrete,and the dynamic elastic modulus decreases by 12%-30%.The concrete in the adsorption zone is subjected to both the dry-wet cycle and the thermal cycle.The two cycles aggravate the capillary and diffusion effects so that the salt is easy to crystallize inside the concrete.Additionally,the thermal cycle accelerates the separation of aggregate and cement matrix,forming more pores,which is conducive to the continued intrusion of salt.The filling effect in the early stage of sodium sulfate crystallization improves the strength,and the mass increases by 0.5%-1.75%.However,the damage effect in the later stage is more serious.关键词
海工混凝土/硫酸盐侵蚀/半浸泡/热循环/干湿循环Key words
concrete in marine engineering/sulfate erosion/semi-immersion/thermal cycle/dry-wet cycle分类
建筑与水利引用本文复制引用
李福海,黄绍宁,肖赛,霍佳腾,范少轩,刘梦辉,丁玉乔,田杨..高温-干湿循环作用下混凝土分区抗硫酸盐的侵蚀性能[J].西南交通大学学报,2026,61(1):41-51,11.基金项目
国家重点研发计划(2021YFB2600900) （2021YFB2600900）
四川省自然科学基金项目(2023NSFSC0025) （2023NSFSC0025）
