Effect of a Carboxylic Acid on Rheological Properties of a High Alumina Cement Mortar

In this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (CH۴۵) produced by the Algerian firm REFRACTAL.The investigated properties are setting time, water consumption, electrical conductivity, pH, density and the compressive strength. The results show a setting time of about ۲۰۰ min for the acid free, ۱۸۰ min with ۰.۱ % of carboxylic acid and ۱۸ hours with ۲ % of this acid. A significant reduction in water consumption was noticed. The water/cement ratio of the acid free-mortar is reduced from ۰.۲۴ to ۰.۱۶ with ۲% acid. The rheological investigations carried out on the mortar-water mixtures with and without carboxylic acid show a Newtonian behavior. The setting of hydrated mortar-water with acid mixtures shows an increase in the apparent density leading to an improvement of the compressive strength.

کلیدواژه ها:

C: CaO ، S: SiO۲ ، H: H۲O ، A: Al۲O۳ ، CAC: Calcium Aluminate Cement