Residuos cerámicos: Una adicion mineral alternativa para sistemas con cemento portland

Autores UPV
Año
CONGRESO Residuos cerámicos: Una adicion mineral alternativa para sistemas con cemento portland

Abstract

Construction and demolition wastes (C&D) represent the most voluminous inorganic solid residue produced by human activity together to the mining processes. An important part of C&D waste is ceramic in nature. Additionally, the manufacturing of ceramic elements (bricks, roof tiles, porcelain wall and floor tiles, sanitary stoneware, porcelain stoneware) also produces huge amounts of ceramic wastes. Some wastes contains amorphous (by thermal decomposition of clays) and vitreous (by melting at high temperatures) phases which could react in Portland cement (PC) mixtures, due to pozzolanic reaction between these phases and the portlandite produced in the hydration of PC constituents (specifically dicalcium and tricalcium silicates). In this study, two ceramic wastes were selected: ceramic floor/wall tiles (GP) and sanitary stoneware (SP). Both materials were ground and then physico-chemical characterized (chemical composition, X-ray diffraction, granulometric analysis, termogravimetry, scanning electron microscopy). Their compatibility with PC was assessed. Pastes and mortars (GP/PC and SP/PC systems) were prepared by replacing 25% of PC by ceramic powder. Evaluation of pozzolanic reaction was measured by means of thermogravimetric analysis in pastes. Compressive strength development was evaluated in mortars cured at 20ºC for different curing times. The obtained results demonstrated the feasibility on the use of these types of ceramic wastes in the design of new cements with less CO2 emissions (by reducing the clinker proportion) and then the contribution to the sustainability in the construction sector.