Experimental Study of the Flow Behaviour of Superplasticized Pastes with Cement-Calcined Clay-Limestone Blends

The superplasticizer demand and evolution of flow in cement pastes with time are significantly affected by the mineral admixtures. It is well known that there could be compatibility issues that arise due to the addition of higher dosages of mineral admixtures. Further, superplasticizers that function satisfactorily in portland cement pastes may not provide good performance in pastes with blended cements. It is, therefore, necessary to study the flow behaviour of pastes with new blends of cement. This paper describes an experimental investigation of the variation of the Marsh cone flow time with superplasticizer dosage in cementitious systems that include: (i) ordinary portland cement (OPC), (ii) portland pozzolana cement (PPC —i.e. OPC with 25% Fly Ash Type F), (iii) Calcined Clay—Limestone—Cement ternary blends. The superplasticizer demand and the evolution of the flow will be discussed. © RILEM 2015.