ternary Blended Cement with limestone filler and kaolinitic calcined clay

ALEJANDRA TIRONI, ALBERTO N. SCIAN, EDGARDO F. IRASSAR

Lausanne

Congreso; 1st International Conference on Calcined Clays for Sustainable Concrete; 2015

AbstractThe use of calcined clays providing from low grade kaolinitic clays combined with thelimestone filler in ternary blended cement formulation has received considerable attention inrecent years. This paper describes the results of a research project to study the behavior ofkaolinitic calcined clays (CC) in combination with limestone filler (F). Blended cements wereobtaining replacing CC (0 to 30%) and F (0 to 10 %) by mass by Portland cement (PC). Thepozzolanicity of blended cement was assessed by the Frattini tests at 2, 7 and 28 days. Theresponse of the system was evaluated in terms of flow, and the compressive strength at 2, 7 and28 days. The hydration progress was determined by the type and amount of hydration compoundsat 2, 7 and 28 days using the Rietveld method. The change in pore size distribution wasdetermined by mercury intrusion porosimetry (MIP). Hydrated phases obtained correspond to thepozzolanic reaction (contribution CC) and phase stabilization (contribution F) modifying the porestructure and all factors contribute to develop acceptable mechanical properties with a largereduction of energy consumption and CO2 emission.