CAJ | 학술논문

对不同配合比混凝土试件在不同海洋区域内进行现场暴露试验,通过硫酸根离子含量测定\SEM 扫描电镜试验及 X 荧光试验,研究实际海洋暴露环境下混凝土内部硫酸盐侵蚀机理。试验结果表明,不同暴露环境下硫酸根作用机理不同,混凝土在不同暴露区域硫酸盐侵蚀程度为潮汐区﹥水下区﹥浪溅区；硫酸根离子由混凝土表层向内部传输,在表层范围内硫酸盐腐蚀产物主要是钙矾石,随着硫酸根离子传输深度增加以及内部游离 CaO 水化成 Ca(OH)2,混凝土硫酸盐损伤程度加剧；混凝土表层 SO42-和 Ca2+含量较高,而混凝土内部 Na+含量较高。
대불동배합비혼응토시건재불동해양구역내진행현장폭로시험,통과류산근리자함량측정\SEM 소묘전경시험급 X 형광시험,연구실제해양폭로배경하혼응토내부류산염침식궤리。시험결과표명,불동폭로배경하류산근작용궤리불동,혼응토재불동폭로구역류산염침식정도위조석구﹥수하구﹥랑천구；류산근리자유혼응토표층향내부전수,재표층범위내류산염부식산물주요시개반석,수착류산근리자전수심도증가이급내부유리 CaO 수화성 Ca(OH)2,혼응토류산염손상정도가극；혼응토표층 SO42-화 Ca2+함량교고,이혼응토내부 Na+함량교고。
Carrying on the exposure experiment of different concrete mix proportion under different marine environ-ment and testing the sulfate content, SEM experiment, XRF experiment, the sulfate corrosion mechanism in concrete is studied. The results show that the sulfate corrosion mechanism is different with the exposure environment varied, and the degree of concrete sulfate corrosion is littoral area > undersea area > splash area. The sulfate invaded from surface to in-ner, and the main corrosion products is ettringite. The concrete sulfate corrosion become serious with the depth increased and free CaO aqueous Ca(OH)2. The content of SO42- and Ca2+ higher in surface, the Na+ content is higher in inside.