Study on Strength and Water Stability Characteristics of Phosphogypsum Stabilized Red Clay Under Dry and Wet Cycles
Aiming at the problems of red clay roadbed in the process of dry and wet cycle operation as well as the waste and pollution phenomenon of phosphogypsum solid waste resources,this paper designs the mix ratio as lime:phosphogypsum:red clay=8∶46∶46,with 10%admixture of OTS-02,and prepares the specimens of the mixes of compaction degree of 90%,93%and 96%under optimal water content,and carries out the unlimited compressive strength test,triaxial test and water stability test under dry and wet cycles.The results showed that the unlimited compressive strength decayed the fastest in the first 2-3 dry and wet cycles,and then slowly decayed and stabilized.The unlimited compressive strength of the mix with 10%OTS-02 admixture was obviously larger than that of the mixtures without admixtures,and the difference became smaller and smaller with the increase of the number of cycles.The unlimited compressive strength increases with age,and the unlimited compressive strength at 7 d of maintenance reaches more than 80%of that at 28 d.With the increase of the number of wet and dry cycles,the internal friction angle of the mix decreases slowly and the cohesion decreases significantly.The water stability of the mixtures without admixtures is very poor,the water stability performance is significantly improved by mixing 10%OTS-02 admixture,and the water stability coefficient decreases with the increase of the number of wet and dry cycles.
wet and dry cyclered clayphosphogypsumstrength characteristicswater stability
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