Study on stress-strain-resistivity and microscopic mechanism of red mud waste modified by desulphurization gypsum-fly ash under drying-wetting cycles

•The mechanical and electrical properties of red mud waste modified by desulphurization gypsum-fly ash are studied, and the feasibility of using resistivity to reflect stress is confirmed.•The influence of drying-wetting cycles on the strength and resistivity properties of the mixture are analyzed.•Mechanism of red mud-desulphurization gypsum-fly ash mixture under drying-wetting cycles is revealed through a series of XRD and SEM analysis.