应力和干湿循环共同作用下硫酸根在混凝土中传输试验研究  

Experiment on Sulfate-ion Diffusion in Concrete under Combined Actions of Stress and Wetting-Drying Cycles

作　　者：潘丽云[1] 杨普[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,河南郑州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：《港工技术》2009年第5期30-32,共3页Port Engineering Technology

基　　金：国家自然科学基金委员会和雅砻江水电开发联合研究基金(50579096);河南省杰出青年科学基金(04120002300)

摘　　要：对混凝土试件施加应力后,按一定周期将其在硫酸钠溶液中浸泡,再风干形成干湿循环作用。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;研究在干湿循环作用下,混凝土受到的拉应力、压应力对硫酸根离子在混凝土内传输的影响规律。结果表明:拉应力对硫酸根离子由外部侵蚀溶液向混凝土内的传输具有加速效果,且随拉应力水平的增加而增大;压应力对硫酸根离子在混凝土内的传输具有一定的抑制作用,但与压应力水平没有确切的相关性。After the concrete specimens were exerted in stress states, they were immersed into suifate sodium solution and then air dried according to certainly period. That forms the action of wetting-drying cycles. The samples were made by drilling,cutting into slices and grinding into powder,and tested by the chemical analysis method. The sulfate-ion content in different depth of the concrete specimens were measured, the effects of tensile stress and compressive stress on diffusion of sulfate-ion in concrete were studied. It is proved that the sul- fate-ion diffusion from outer solution into concrete is accelerated by the tensile stress ,and tends to be quicker with the increase of stress level. Oppositely, it is confined by the compressive stress, but no certain relationships with the level of it.

关 键 词：混凝土 硫酸盐侵蚀 干湿循环 应力水平 硫酸根离子 传输规律 

分 类 号：TU528[建筑科学—建筑技术科学]