CAJ | 학술논문

对连续浸泡和干湿循环2种侵蚀方式下硫酸根离子在混凝土中的传输过程进行了比较研究.选取混凝土强度等级为C40,采用室温下自然干燥方式,硫酸钠侵蚀溶液的浓度为800,6 000,50 000 mg/L.当侵蚀龄期分别达到30,90,180,360,580 d时,采用钻芯、分层切片、研磨提取水泥石粉末样本进行化学分析,测定不同深度处混凝土的硫酸根离子含量.结果表明:总体上看干湿循环与连续浸泡相比更具有加速硫酸根离子向混凝土内传输的作用,使同深度处硫酸根离子含量增加;浓度较低的侵蚀溶液硫酸根离子具有更易于向混凝土深处传输的趋势,使较深处硫酸根离子含量增加;浓度较高的侵蚀溶液更偏于按着由表及里破坏的方式对混凝土产生侵蚀,使高含量的硫酸根离子聚集在浅层混凝土中.
대련속침포화간습순배2충침식방식하류산근리자재혼응토중적전수과정진행료비교연구.선취혼응토강도등급위C40,채용실온하자연간조방식,류산납침식용액적농도위800,6 000,50 000 mg/L.당침식령기분별체도30,90,180,360,580 d시,채용찬심、분층절편、연마제취수니석분말양본진행화학분석,측정불동심도처혼응토적류산근리자함량.결과표명:총체상간간습순배여련속침포상비경구유가속류산근리자향혼응토내전수적작용,사동심도처류산근리자함량증가;농도교저적침식용액류산근리자구유경역우향혼응토심처전수적추세,사교심처류산근리자함량증가;농도교고적침식용액경편우안착유표급리파배적방식대혼응토산생침식,사고함량적류산근리자취집재천층혼응토중.
The erosion modes of both continuous immersion and wetting-drying cycles were selected to study their effects on the transportation process of sulfate-ion in concrete. The strength grade of concrete was C40, the natural dry mode in room temperature was used. The concentration of sodium sulfate solutions were 800 mg/L, 6000 mg/L and 50 000 mg/L respectively. With the erosion ages of 30 d, 90 d, 180 d, 360 d and 580 d, the samples were made by drilling core, cutting into slices and grinding into powder, and tested by the chemical analysis method. In comparison with continuous immersion, the wetting-drying cycles can generally accelerate the sulfate-ion transportation into concrete in deep, and increase the sulfate-ion content in the same depth of concrete. The sulfate-ions in erosion solution of lower concentration tend to be transported into deep place of concrete where the sulfate-ion content will be increased. The erosion solution of high concentration tends to generate concrete failure from the exterior to the interior, so much more sulfate-ions are gathered in the shallow layer of concrete.