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

Document Type: Research Article

Authors

1 Research Unit on Emerging Materials (RUEM), University Ferhat Abbas Setifl, Setif 19000, ALGERIA

2 Laboratory of Non Metallic Materials, Institute of Optics and Precision Mechanics, University Ferhat Abbas Setif1, Setif 19000, ALGERIA

3 Laboratory MATEIS (UMR CNRS 5510), Bat. Blaise PASCAL, INSA, Villeurbanne, FRANCE

Abstract

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.

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