The effective utilization of phosphogypsum (PG) and industrial waste soil is of paramount importance in the real world. The combination of phosphogypsum and soil in a single mixture can simultaneously utilize both materials. In this study, a novel green road material was developed according to the concept of synergistic utilization of multiple solid wastes, which is based on conventional cement stabilized soil. The GGBS was employed to gradually replace cement to stabilize PG-soil mixtures. The curing effect of GGBS replacing cement and the modification effect of PG on stabilized soil were evaluated in three aspects: mechanical properties, water stability, and environmental performance. This evaluation was conducted using the unconfined compressive strength (UCS), softening coefficient, and ionic concentration of heavy and trace metals. Furthermore, microscopic characterization techniques, including a pH meter, UV-visible spectrophotometer, FTIR, XRD, SEM, and EDS, were used to perform further analyses of the curing mechanism. The objective was to enhance the UCS of stabilized soil by incorporating an optimal amount of PG, avoiding the necessity for a complex and costly pretreatment process for PG. The UCS reached approximately 8 MPa in 7 days without immersion in water curing and 4 MPa in 7 days with 1 day immersion in water curing. Despite the decline in water stability resulting from the incorporation of PG, the stabilized soil exhibits superior mechanical properties compared to the majority of studies on the application of PG to stabilized soils. The monitoring of contaminant ions in the stabilized soil over a period of 28 days demonstrated compliance with EPA requirements, indicating that PG-based stabilized soil does not negatively impact the surrounding environment in the presence of water. Additionally, the optimal ratio of GGBS to cement is 1:1. Meanwhile, excessively high or low cement content has a detrimental impact on the properties of stabilized soil. Lastly, the practical engineering application of this novel green road material was achieved, and its mechanical properties and economic benefit were demonstrated to be superior to those of conventional cement stabilized soil. The study of PG in stabilized soil was transformed into the utilization of realworld projects without the necessity for a complex pretreatment process for PG. Concurrently, the replacement of GGBS for cement results in a reduction in both carbon emissions and economic costs, due to an enhanced utilization of solid waste. Additionally, it offers a more detailed analysis of the curing mechanisms in stabilized soils with respect to strength, water stability, and harmful ions.

来源平台：CONSTRUCTION AND BUILDING MATERIALS