Experimental Study on the Road Performance of High Content of Phosphogypsum in the Lime–Fly Ash Mixture

Phosphogypsum (PG), as a by-product of the production phosphoric acid, faces problems large annual output and difficult treatment. There is demand for fillers in process road paving, which may be an effective method utilization PG resources. In this study, three proportions phosphogypsum–lime–fly ash (PLF) mixture were designed, first, according to orthogonal tests. The comprehensive performance PLF was tested by compression rebound modulus test, unconfined compressive strength flexural tensile dry shrinkage temperature respectively. results show that adding crushed stone can effectively improve modulus, strength, strength. high content also properties mixture. According layer requirements, optimum proportion recommended, benefit construction