Complex Characterization and Behavior of Waste Fired Brick Powder-Portland Cement System

RAHHAL, VIVIANA FÁTIMA; TREZZA, MÓNICA ADRIANA; TIRONI, ALEJANDRA; CASTELLANO, CLAUDIA CRISTINA; PAVLÍKOVÁ, MILENA; POKORNÝ, JAROSLAV; IRASSAR, EDGARDO FABIAN; JANKOVSKÝ, ONDREJ; PAVLÍK, ZBYSEK

Materials

MDPI

Año: 2019 vol. 12

Two waste firedbrick powders coming from brick factories located in Argentine and Czech Republicwere examined as alternative mineral admixtures for the production of blended cements.In pastes composition, local Portlandcements (Argentine and Czech) were substituted with 8?40%, by mass, withpowdered ceramic waste. For the ceramic waste-Portland cement system, workability,the heat released, pozzolanity, specific density, compressive strength,hydrated phases, porosity, and pore size distribution were tested. Therelevance of the dilution e_ect, filler e_ect, and pozzolanic activity was analyzed to describethe general behavior of the pozzolan/cement system. The properties andperformance of cement blends made with finely ground brick powder depended onthe composition of ceramic waste and its reactivity, the plain cement used, andthe replacement level. Results showed that the initial mini-slump was not a_ected by a low ceramic waste replacement (8% and 16%),and then it was decreased with an increase in the ceramic waste content. Brickpowder behaved as a filler at early ages, but when the hydration proceeded, itspozzolanic activity consumed partially the calcium hydroxide and promoted theformation of hydrated calcium aluminates depending on the age and presentcarbonates. Finally, blended cements with fired brick powder had low compressive strengthat early ages but comparable strength-class at later age.