Expansive soils present significant challenges to infrastructure due to their tendency to undergo substantial volume changes with moisture variations. While traditional stabilization methods using lime and cement have been extensively studied for their effectiveness in mitigating these issues, the durability of expansive soils stabilized with alkaline activators remains underexplored. In this research, a highly expansive soil, the residual Bringelly shale (RBS) collected from Western Sydney area, was stabilized with lime, sodium hydroxide (NaOH) without any exogenous precursors, and a combination of both (the hybrid treatments). The treated samples were subjected to wetting and drying (W-D) cycles to assess the durability. Durability was investigated in terms of the Brazilian tensile strength (BTS), unconfined compression strength (UCS) and mass loss tests after the samples were subjected to the W-D cycles. The hybrid-treated samples withstood 11 full cycles before failing on the 12th, while lime-treated and exogenous precursor-free NaOH-treated samples endured 5 and 3 cycles before being fully disintegrated, respectively. UCS tests showed that lime-treated samples had higher strength at first, but their strength decreased more quickly with repeated cycles. On the other hand, hybrid-treated samples were more durable and resisted damage better under changing environmental conditions.