The effects of styrene-butadiene copolymer emulsion with different particle sizes on the physical properties and hydration characteristics of sulfoaluminate cement-gypsum mortar were investigated at a high dosage(15％).The results show that small particle size of styrene-butadiene copolymer emulsion was more beneficial to improve the fluidity,flexural strength,tensile adhesive strength of sulfoaluminate cement-gypsum mortar,and reduced the compressive strength,capillary water absorption and porosity of sulfoaluminate ce-ment-gypsum mortar.In addition,small particle size styrene-butadiene copolymer emulsion accelerated the hydration of sulfoaluminate ce-ment-gypsum and promoted the growth of AFt than large particle size styrene-butadiene copolymer emulsion.
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