Influence of Gluconate, Lignosulfonate, and Glucose Admixtures on the Hydration of Tetracalcium Aluminoferrite in the Presence of Gypsum with or without Calcium Hydroxide

Abstract

The influence of 0.3 wt% gluconute, lignosulfonate, or glucose on the hydration of 4CaO·A1 2 O 3 ‐Fe 2 O 3 in the presence of gypsum with or without Ca(OH) 2 , was examined. In the absence of Ca(OH) 2 all the admixtures retard both ettringite production and subsequent conversion of ettringite into the monosulfate in the decreasing order glucose >lignosulfonate >gluconate. In the presence ofCa(OH) 2 all the admixtures accelerate early ettringite production but do not affect subsequent conversion of ettringite into the monosulfate, at least up to 28 d.