CAJ | 학술논문

以混凝土强度、氯盐种类、氯盐浓度、侵蚀方式为评价指标，研究干湿循环条件下混凝土所受到的盐胀劣化机理。研究表明，氯离子侵蚀混凝土表面的量随强度等级的提高而减小；经多次干湿循环后，由于盐结晶作用，混凝土会发生膨胀；干湿循环比长期浸泡的混凝土表面氯离子浓度高；随浸泡龄期的增长，混凝土表层氯离子浓度不断增长，但后期增长缓慢。分析混凝土经干湿循环后表层XRD图谱以及混凝土在氯盐溶液中浸泡后SEM图谱，得出氯盐融雪剂对混凝土的盐胀破坏是物理结晶腐蚀和化学腐蚀综合作用的结果。
이혼응토강도、록염충류、록염농도、침식방식위평개지표，연구간습순배조건하혼응토소수도적염창열화궤리。연구표명，록리자침식혼응토표면적량수강도등급적제고이감소；경다차간습순배후，유우염결정작용，혼응토회발생팽창；간습순배비장기침포적혼응토표면록리자농도고；수침포령기적증장，혼응토표층록리자농도불단증장，단후기증장완만。분석혼응토경간습순배후표층XRD도보이급혼응토재록염용액중침포후SEM도보，득출록염융설제대혼응토적염창파배시물리결정부식화화학부식종합작용적결과。
The deterioration mechanism of concrete for the salt expansion under wet-dry cycles were studied by using concrete strength , the types of chloride,concentration and attack ways as evaluation index.Results show that the amount of chloride ion decreases with the improvement of concrete strength on the surface.After multiple wetting drying cycles,due to salt crystallization,concrete expansion will occur.The surface chloride ion concentration of concrete under wet-dry cycles is higher than long-term immersion.The content of chloride ion on the concrete surface increases rapidly with the growth of immersion ,while slowly in the late stage.The salt expansion is the result of integration effect of physical and chemical resistance through the analysis of XRD under wet-dry cycles and SEM after immersion.