硫酸盐侵蚀作用下混凝土动弹性模量的退化

关键字：硫酸盐,侵蚀,作用,混凝土,弹性模量

（1. 吉林大学 建设工程学院，吉林 长春  130021；2.冻土工程国家重点实验室，甘肃 兰州  730000）

    摘要：试验研究了混凝土在硫酸盐侵蚀与不同环境因素（干湿交替、冻融循环）耦合作用下混凝土动弹性模量的退化规律，进一步解释了硫酸盐侵蚀-干湿循环和硫酸盐侵蚀-冻融循环2种工况下混凝土的破坏机理。结果表明，混凝土在双因素作用下的损伤程度远远大于单一因素作用，且硫酸盐-干湿循环作用对混凝土动弹性模量的影响是硫酸盐-冻融循环作用的1.4倍。另外，低水胶比以及加入适量引气剂能在一定程度上提高混凝土抗硫酸盐侵蚀的能力。
    关键词：混凝土；相对动弹性模量；硫酸盐；冻融循环；干湿循环
    中图分类号：TU528        文献标识码：A        文章编号：1001-702X（2018）01-0088-04
 

Degradation of dynamic elastic modulus of concrete under the sulfate attack
PENG Honglu1，WANG Boxin1，2，MA Yi1，CHANG Zheng1，WANG Yufeng1，GUO Han1
（1.College of Construction Engineering，Jilin University，Changchun 130021，China；
2.State Key Laboratory of Frozen Soil Engineering，Lanzhou 730000，China）

    Abstract：In the test，the damage degradation law of dynamic elastic of concrete under the sulfate attack and environments multiple factors（freezing-thawing cycles、dry-wet cycles） was studied，and mechanism of failure of concrete by double factors of sulfate attack and dry-wet cycles or freezing-thawing cycles were explained further. Based on the testing results，the damage degree of concrete under the action of multiple factor at the same time is much larger than a single factor，and in the situation of sulfate attack and dry-wet cycles，the effect on dynamic elastic of concrete is 1.4 times that of sulfate attack and freezing-thawing cycles. In addition，with low water cement ratio and appropriate air-entraining agent，the ability of concrete resisting to erosion can be improved to a certain extend.
    Key words：concrete，relative dynamic elastic modules，sulfate，freezing-thawing cycles，dry-wet cycles