Abstract：Sulphoaluminate cement was added into Portland cement, and styrene butadiene latex was used as polymer modified agent to prepare the patching materials with high performance. The influence and mechanism of sulphoaluminate cement and styrene butadiene latex on compressive strength, setting time and viscosity of patching materials were studied. The results show that sulphoaluminate cement can obviously increase the early strength,shorten the initial setting time and final setting time, and increase the viscosity of the composite cement. The styrene butadiene latex can form a network structure and increase the compressive strength of the composite cement. The carboxyl groups can slow the hydration rate of 3Ca O·Al₂O₃, 3CaO·SiO₂ and 2CaO·SiO₂, so the initial setting time and final setting time increase obviously and the viscosity decreases.

Keywords: composite cement; sulphoaluminate cement; styrene butadiene latex; property