PORTLAND CEMENT PRODUCTION FROM RAW MATERIALS
Abstract
In the production of third-type cement, a mixture of limestone and clay was replaced with Recycled Concrete Aggregates (RCA) at 24%, 49%, 74%, and 86% by mass. The klinkerization was carried out at temperatures of 1450°C, 1400°C, 1350°C, and 1300°C. The produced cements were analyzed in terms of physical-mechanical properties, expansion ability, hydration (calorimetry), and phase formation (XRD and thermogravimetry). Compared to the reference cement, the amount of alite (C3S) increased in the cements produced with Ground Granulated Blast Furnace Slag (GRF). For cements with 50% and 100% GRF in the clinker, similar mechanical strength values to the reference cement were observed, although there was no impact on CO2 emissions. It was also found that cements produced at 1350°C with 74% clay-limestone mixtures replaced by ACW had mechanical strength comparable to the reference cement without ACW, contributing to the reduction of CO2 emissions and energy consumption.
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