Experimental Development of the Use of Sodium Lignosulfonate as a Superplasticizer Additive in Mortars Used in Civil Construction

Abstract

The use of stabilized mortar has increased in Brazil in recent years, as it provides greater productivity and rationality on construction sites. One of the greatest technological advances in the mortar business has been the development of new additives, which have been of great help to the civil construction industry. The main objective of this work was to analyze the influence of sodium lignosulfonate on the properties of self-leveling mortars using white cement, limestone and other additives. The repercussions from the addition of sodium lignosulfonate into the prepared mortar were evaluated by mass consistency assays, tensile strength and compression tests. The addition of sodium lignosulfonate negatively influences the fluidity of the mortar for addition values higher than 0.6% compared to white cement. However, for concentrations equivalent to 0.2% and 0.4% there is an increase in fluidity. There is a progressive increase in the compressive and tensile strength of the analyzed mortar, as it approaches its 28th day of mortar hydration, for additions of sodium lignosulfonate, respectively, at concentrations of 0.2, 0.4 and 0.6%, except for the concentration of 0.8%.