侵蚀方式对硫酸根离子在混凝土中传输的影响  

Influences of Erosion Modes on Sulfate-ion Transportation in Concrete

作　　者：李凤兰[1] 马利衡[1] 高润东[2] 赵顺波[1] 

机构地区：[1]华北水利水电学院土木与交通学院,郑州450011 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《长江科学院院报》2010年第3期62-65,共4页Journal of Changjiang River Scientific Research Institute

基　　金：河南省杰出青年科学基金(04120002300);国家自然科学基金委和雅砻江联合基金(50579096)

摘　　要：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。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.

关 键 词：混凝土 硫酸盐侵蚀 连续浸泡 干湿循环 硫酸根离子 传输 

分 类 号：TU528[建筑科学—建筑技术科学]