Waste marble dust and recycled glass valorization in the production of ternary blended cements

Abstract

The purpose of the present investigation is to examine the physicomechanical properties and the hydration development of ternary blended cements, composed by waste marble dust (WMD) and soda lime recycled glass (SLRG). Both wastes characteristics were investigated by means of chemical analysis, laser particle size analyzer and X-ray diffraction (XRD). Prior to their addition as substitutes for Ordinary Portland Cement (OPC), they were grounded to a specific surface area of 4000 cm²/g. Twelve different cement mixtures were produced, containing up to 20% of the above-mentioned wastes, in various proportions. The produced cements mixtures were evaluated, examining their setting times, standard consistency, soundness and compressive strength at 2, 7, 28, 56 and 90 days. The resistance to the alkali-silica reaction of the cement mixtures contained SLRG and the corresponding expansion was determined in prismatic mortar bars, at 38 °C, after 14, 28, 60, 90 and 180 days. The determination of their hydration evolution was accomplished by X-ray diffraction and thermogravimetric and differential thermal (TG/DTG) analyses. According to the results, WMD could be readily valorized together with SLRG as cementitious additions for cement replacement.

Keywords: Blended cements; Hydration; Soda lime recycled glass; Waste marble dust.