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 (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.