Rheological behavior as influenced by plasticizers and hydration kinetics

In the calcium aluminates cement – Portland cement – calcium sulfate based self leveling underlayments, the influence of raw materials on the properties such as rheology and hydration kinetics was considered. It was confirmed that calcium aluminates cement system formulation is suitable in cases where a short open time is required, and Portland cement system formulation is suitable in cases where a long open time is required with the result of flowability or rheology. And, in order to thin the viscosity of slurry, it turned out that the application of MF 2651F as a plasticizer and tartaric acid as a retarder were effective. Moreover, MF 2651F seldom delayed the hydration reaction compared with other plasticizers. The flow value and the yield stress showed correlation, without being dependent on the difference in formulation or a water powder ratio. This was considered to be because for the yield stress to relate to the fragility of the aggregation structure of slurry.