大掺量矿渣水泥抗硫酸盐侵蚀性能测试方法研究

Test Method for Resistance to Sulfate Attack of Cement with High Volume of Slag

对通过化学激发自制的大掺量矿渣水泥的抗硫酸盐侵蚀性能进行评定:首先采用长期浸泡方法进行测定,评判指标为线膨胀率和抗折强度比,结果表明该矿渣水泥具有优异的抵抗高浓度硫酸盐侵蚀的性能;其次采用GB/T 749—2001规定的快速试验方法进行测定,测定结果与长期浸泡方法有异.采用改进的快速试验方法,并以线膨胀率差(掺石膏粉试体14 d线膨胀率-正常试体14d线膨胀率)来评定矿渣水泥的抗硫酸盐侵蚀性能,可避免矿渣水泥水化过程中微膨胀所带来的附加干扰,从而使其测试结果与长期浸泡方法相同.

The cement with high volume of slag was made by chemical activation,then its resistance to sulfate attack was evaluated. Firstly,the resistance to sulfate attack of slag cement was tested by long term immersion method,and line expansion rate and flexural strength ratio were taken as evaluation index. The results show that the slag cement has outstanding resistance to high concentrated sulfate attack. Second, according to GB/T 749 2001, the resistance to sulfate attack of slag cement was tested by quick testing method,but the result is different from that of long term immersion method. Therefore, the modified quick testing method was used and the resistance to sulfate attack of slag cement was evaluated by line expansion rate difference （line expansion rate difference=line expansion rate of specimen with gypsum after 14 d-line expansion rate of normal specimen after 14 d）. As a result the interference of slight expansion in hydration of cement could be eliminated,and the test result is as the same as that of long term immersion method.