Relationships between Rheological Constant of Cement Paste and Fluidity of High-Fluidity Concrete

In order to develop a method for evaluating the fluidity of high-fluidity concrete using cement paste, the relationships between the rheological properties of cement paste and the slump flow of the concrete were investigated, using several commercial Portland cements. The rheological constants of the cement paste were measured with a rotating viscometer changing the mixing procedure, dosage of superplasticizer, and the operation conditions of the viscometer. The yield values of cement pastes measured with a parallel-plate type rotating viscometer were found to show good correlation with the slump flows of concretes.