Abstract In this paper, the rheological behavior of blended cements consisting of calcium sulphoaluminate clinker (CSA), ordinary Portland clinker (OPC) and anhydrite (C S ¯ ) were investigated. The shear stress-shear rate curves of OPC-CSA-C S ¯ blends with different OPC/CSA/C S ¯ ratios were analyzed. Several rheological models were used to fit the rheological curves of cement pastes. The evolution of static yield stress was also monitored to evaluate the structural build-up rate of the blends. Besides, zeta potential measurement, calorimetric test, XRD and TGA analysis were carried out to reveal the physico-chemical kinetics of the rheological evolution of fresh blends. It was found that not only CSH gel but crystals of AFt and gypsum formed at the early age make contributions to the rheological parameters, i.e. plastic viscosity, yield stress and structural build-up.