1Research Unit on Emerging Materials (RUEM), University Ferhat Abbas Setifl, Setif 19000, ALGERIA
2Laboratory of Non Metallic Materials, Institute of Optics and Precision Mechanics, University Ferhat Abbas Setif1, Setif 19000, ALGERIA
3Laboratory MATEIS (UMR CNRS 5510), Bat. Blaise PASCAL, INSA, Villeurbanne, FRANCE
In this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (CH45) 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 200 min for the acid free, 180 min with 0.1 % of carboxylic acid and 18 hours with 2 % of this acid. A significant reduction in water consumption was noticed. The water/cement ratio of the acid free-mortar is reduced from 0.24 to 0.16 with 2% 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.