钢渣微粉—水泥复掺固化硫酸盐渍土盐胀特性试验

Experiment on Salt Swelling Characteristics of Steel Slag Micropowder-Cement Compounding Solidified Sulfate Soil

本文研究和讨论了土体在钢渣微粉、水泥不同掺加方式、不同掺量下单次降温过程中的变化规律以及不同的冻融周期循环下土体的盐胀率变化情况,并对单掺钢渣微粉、单掺水泥以及复掺下进行了分析,发现以下规律:①在未掺加固化材料的土样中,其土样的盐胀量为最大,且明显高于掺加固化材料的试样,对比掺加固化材料的土样,以混掺钢渣微粉和水泥土样中的盐胀量为最小;②对比在数次冻融周期下,掺加钢渣微粉和水泥两种材料的土样,其盐胀累计变化量更小;③钢渣微粉和水泥两种材料复掺时的掺量为2%+2%,第4冻融周期其累计盐胀率开始趋向于平稳,此时达到累积盐胀率0.17%。

This studies and discusses the variation law of soil in the single cooling process of steel slag powder and cement under different mixing methods and amounts,and the change of soil salt expansion rate under different freeze-thaw cycles.The steel slag micropowder,cement alone and mixing of the two materials were analyzed in detail,and the following rules were found:①In the soil samples without solidified materials,the salt swelling of the soil samples was the largest,and Significantly higher than the samples mixed with solidified materials,compared with the soil samples mixed with solidified materials,the amount of salt swelling in the soil samples mixed with steel slag powder and cement is the smallest;②Compared with several freeze-thaw cycles,after mixing For soil samples with two materials,steel slag powder and cement,the cumulative change in salt swelling is smaller;③When the steel slag powder and cement are mixed,the content of the two materials is 2%+2%,and the cumulative amount of the fourth freeze-thaw cycle is 2%+2%.The salt expansion rate began to tend to be stable,and at this time,the cumulative salt expansion rate reached 0.17%.