混凝土抗硫酸盐浸蚀试验方法分析

Analysis of Test System for Concrete Sulfate Erosion

针对国内混凝土抗硫酸盐试验存在不同试验方法的现象,分析了试验中试件尺寸、评价指标、循环方法的变化对试验结果的影响。分析结果表明:小尺寸试件的耐硫酸盐腐蚀评价指标容易出现离散现象,但试验时间较短;大尺寸试件需要较长的浸蚀时间,但耐硫酸盐腐蚀评价指标一致性较高。采用相对动弹模量作为耐硫酸盐腐蚀评价指标,可以减少初期成型大量试块的不便,也利于检测。规范中推荐的干湿循环方法较为合理,若要进一步加速腐蚀速度以达到缩短试验时间的目的,可以适当缩短浸蚀和烘干时间,但烘干时的温度不宜大于80℃。

In view of the different testing methods on the anti-sulfate erosion, this paper analyzes the influence of different specimen sizes, evaluation indexes and circulation systems on concrete sulfate resistance test. Research shows that the small size specimen often cause sulfate corrosion evaluation index discretized, but the test time is short. On the other side, the large specimen sizes need longer test time, but the evaluation index often shows consistency. The relative dynamic elas- tic modulus as the evaluation index for the sulfate corrosion can reduce inconvenience of forming large blocks at initial stage and easy to test. The dry-wet cycling system recommended by the standard is reasonable. In order to further accelerate the corrosion speed and shorten test time, the etching and drying time can be shortened appropriately, but the drying tempera- ture should not be higher than 80 ℃.