Experimental research on performance of high dosage phosphogypsum used as subgrade filler
In order to explore the resource utilization path of phosphogypsum,high dosage phosphogypsum subgrade fillers are prepared with self-made curing agent and cement as cementitious materials.The compaction test,unconfined compressive strength test and hydrophobic modification test of high dosage phosphogypsum mixture are carried out to analyze the adaptability,compaction characteristics,strength and water resistance.The results show that the compaction curve of phosphogypsum modified by cement or self-made curing agent shows a single peak change trend,and the low moisture content has little effect on the dry density of high dosage phosphogypsum mixture.At the same proportion,the 7-day unconfined compressive strength of high dosage phosphogypsum mixture in the curing agent system is more than 1.5 times that of the cement system,and the adaptability of the phosphorus tailings and the self-made curing agent is better than that of the clay.The 7-day unconfined compressive strength of high dosage phosphogypsum mixture with the proportion of 90%phosphogypsum and 10%curing agent reaches 3.4MPa,and the strength is further improved to 4.2MPa after hydrophobic modification.The combination of hydrophobic agent and self-made curing agent improves the hydrophilic properties of phosphogypsum and its water stability.
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