Experimental study on improvement of water stability of phosphogypsum stabilized red clay

In order to improve the water stability characteristics of phosphogypsum-stabilized red clay and make full use of industrial waste phosphogypsum, cement was used as a curing agent to prepare samples, the optimal proportions of three groups of phosphogypsum cement stabilized red clay were obtained through the unconfined compressive strength test, and then the water stability test of the mixture was carried out. The research results show that the water stability of the phosphogypsum stabilized soil mixture is poor and needs to be further improved; the water stability of the mixture can be improved by adding water glass alone, and the more water glass content, the better the water stability of the phosphogypsum mixture. The unconfined strength of the sample reinforced with water glass + calcium chloride after immersion is reduced by about one-third, and the proportion can be increased in the later stage. This experiment can provide a reference for improving red clay, utilizing industrial waste residue and studying the water stability characteristics of red clay in Guizhou.