Soil shrinkage characteristic curve (SSCC) is the relationship between gravimetric water content (w) and void ratio for a soil drying under zero external stress. It is mandatory for determining the soil-water characteristic curve and modeling water transport in high plastic soils, which exhibit significant volume change. The knowledge of SSCC is required for calculating the degree of saturation or volumetric water content from the known w. However, the measurement of SSCC is extremely tedious and time consuming, particularly for highly plastic clays like bentonite. Therefore, this study attempts to develop a predictive model for SSCC of highly plastic soils based on easily measurable index property, plasticity index (PI). Four bentonites and nine bentonite–fly ash mixes were used to encompass soils with a wide range of PI. The results were used to study the influence of plasticity characteristics on SSCC. The key parameters of SSCC; minimum void ratio, water content at air entry
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