The properties of cementitious materials superplasticized with two superplasticizers based on aminosulfonate–phenol–formaldehyde

Two kinds of aminosulfonate–phenol–formaldehyde condensate superplasticizers AS based on sodium p-aminobenzenesulfonate and SDMAS based on sodium p-N,N-dimethylaminobenzenesulfonate were synthesized. The properties of cementitious materials superplasticized with the synthesized superplasticizers such as the hydration heat and viscosity of cement pastes, compressive strength and flexural strength of cement mortars was assessed. The results showed that the SDMAS has the stronger ability of inhibiting cement hydration than AS, the initial viscosity of paste with AS is lower than that with SDMAS, the mechanical strength of superplasticized mortars are higher than those of plain mortars at 7 and 28 days, and the mechanical strength of mortars with SDMAS are higher than with AS at 28 days and lower than with AS at 7 days.