Applicability of cathodic protection to reinforced concrete subjected to chloride induced deterioration and ASR

研究了电流作用于钢筋混凝土对碱含量分布和ASR膨胀的影响，得出了以下结果。(1)随着试件中电流密度的增加，钢筋周围的碱性金属离子浓度增加，离子迁移量取决于累积电流密度。(2)当前促进了ASR的扩展。悲观值与电流密度的关系也得到了证实。(3)约5 mA/m2的电流密度对ASR的扩展没有很大的促进作用。(4)ASR展开量可以表示为电流密度和电流持续时间的函数。(5)采用大电流密度(1a/m2、2a/m2)进行阴极保护时，可以抑制阴极保护过程中ASR的膨胀。

Investigation of the effects of electrical current applied to reinforced concrete on alkali content distribution and ASR expansion produced the following results. (1) An increase in the current density in the specimen was accompanied by an increase in the concentration of alkaline metal ions around the reinforcing steel, and the amount of ion migration is considered to depend on the cumulative current density. (2) The current promoted ASR expansion. The dependence of the pessimum value on the current density was also confirmed. (3) A current density of about 5 mA/m2was not found to promote ASR expansion to a large degree. (4) ASR expansion can be expressed as a function in terms of the current density and current duration. (5) By supplying a large current densities(1A/m2, 2A/m2) before application of the cathodic protection, ASR expansion during application of the cathodic protection could be restrained.