Effect of Clay Mineralogy, Particle Size, and Chemical Admixtures on the Rheological Properties of CCIL and CCI/II Systems

A major challenge of calcined clay cements is the flow properties. This research addresses binary and ternary CCIL (calcined clay blended with an ASTM C595 Type IL cement at the ready-mixed plant) and CCI/II systems and the effect of particle size and chemical admixtures on rheological characteristics. The effects of six different calcined clays and a superplasticizer and viscosity reducing admixture on the static and dynamic yield stress and viscosity of the blended paste were measured. While calcined clay systems alter the cementitious system flowability, modern chemical admixtures can custom-tailor the concrete rheological properties for robust placement and consolidation.