[4] PONGSIVASATHIT S, HORPIBULSUK S, PIYAPHIPAT S. Assessment of mechanical properties of cement stabilized soils［J］. Case Studies in Construction Materials, 2019, 11: e00301.

[5] AZZAM W R. Utilization of polymer stabilization for improvement of clay microstructures［J］. Applied Clay Science, 2014, 93/94: 94-101.

[16] FARROUKH H, MNIF T, KAMOUN F, et al. Stabilization of clayey soils with Tunisian phosphogypsum: effect on geotechnical properties［J］. Arabian Journal of Geosciences, 2018, 11(23): 760.

[20] CAPOTOSTO A, RUSSO G. Effects of pore-water pH and calcium concentration on the microstructure of kaolin［J］. Géotechnique Letters, 2020, 10(1): 38-44.

[26] RAJKOVIC M, TOSKOVIC D V. Phosphogypsum surface characterisation using scanning electron microscopy［J］. Acta Periodica Technologica, 2003(34): 61-70.