Durability of Blended Cement Pastes Containing Ceramic Waste as a Pozzolanic Addition

摘要

Durability is one of the focal points of recent research on theudbehavior of new blended cement matrices in aggressive environments.udThe material selected for this study was ceramic wasteud(CW) rejected by Spanish manufacturers, primarily for reasonsudsuch as unsuitable kiln temperature or dimensional or mechanicaludfailure. The resistance of CW-containing cement pastes toudthree aggressive environments (SO4ud2 –, Cl– , and substitute seawater)udwas tested using the Koch–Steinegger method in thisudin-depth analysis of the effect of CW on the chemical resistanceudof new blended matrices. The samples were also testedudfor performance in freeze–thaw cycles. The reaction mechanismudwas analyzed using X-ray diffraction (XRD), pore-size distribution,udscanning electron microscopy (SEM), and backscatteredudelectron images (BSE) with energy-dispersive X-ray (EDX)udtechniques. The results showed that CW contributed to cementudresistance to such media; this enhancement of its mechanicaludproperties was the result of the pozzolanic reaction induced byudthe addition of CW.