Effect of novel calcium sulfate compositions and lignosulfonate admixture on cement hydration and rheology
Keywords:
phosphogypsum, gypsum, lignosulfonate, hydration, rheologyAbstract
This research examines the effects of different calcium sulfate combinations—natural gypsum (NG), untreated phosphogypsum (PG), and lime-treated phosphogypsum (NPG)—on the hydration and rheology of Portland cement with a lignosulfonate admixture. Three novel calcium sulfate compositions (SU I, II, III) were evaluated as setting regulators in Portland cement types CEM I, II, and III, focusing on setting times, compressive strength, heat release, hydration products, and rheological behavior. The compositions are: SU I (30% PG, 70% NG), SU II (50% NPG, 50% NG), and SU III (100% NPG). Results showed that CEM III had lower early strength and longer setting times than CEM I and II, effects amplified by the lignosulfonate admixture. Rheological differences among cements were attributed to PG's delayed hydration, reducing yield stress and viscosity. The study highlights how cement composition, alternative calcium sulfates, and admixtures interact to affect fresh and hardened cement properties.
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