Effect of shear rate and duration change on the rheological properties of cementitious systems having different C 3 A content

Abstract

Time dependent rheological behavior of cementitious systems significantly affects pumpability, degree of compressibility and hydrostatic pressure. Rheological parameters are affected by cement type, amount and fineness, additive type and dosage, ambient conditions, measurement device, method and process. It was reported that the C3A content is important parameters affecting the rheological behavior of the cementitious systems. However, since the number of studies examining the effect of C3A and measurement methods on thixotropic behavior is limited. In this study, the effects of maximum shear rate, duration and shear rate increase ratio variation on thixotropy of cementitious systems having different C3A content (2.13 %, 3.60 %, 6.82 % and 9.05 %) were investigated. Rheological behavior of mixtures at beginning and 20th-minute was examined by using loop test. As a result of increase in C3A content and decrease in shear rate, the dynamic yield stress, apparent viscosity, structural build-up area and structure formation ratio values increased.