Desenvolvimento preliminar de uma argamassa colante geopolimérica

Abstract

The advance of civil construction, linked to the growth of the ceramic products market, stimulates the production of adhesive mortars that are used in settling ceramic plates. NBR 14081-1 (ABNT, 2012) classifies mortars according to their application purpose, thus AC I is indicated for the application of internal covering and has an open time of 15 min and minimum adhesion resistance of 0, 5 MPa. As an alternative to the type of binder traditionally used for the production of these mortars, low environmental impact binders emerge, such as the alkaliactivated geopolymer class. Synthesis occurs through the chemical reaction of an amorphous aluminosilicate material that is activated by an alkaline solution. Therefore, the present work aims to preliminarily evaluate a trace of geopolymeric mortar without additives for settling ceramic tiles and compare its performance with a commercial industrialized adhesive mortar AC I. Metakaolin (MK) was used as the source of aluminosilicate and a commercially available sodium hydroxide and sodium silicate activating solution, 1: 1 ratio (MK: sand), Na2O = 15% Ms = 0.75 and water / binder ratio of 0.30. Samples were evaluated for open time, reduced slip and adherence tensile strength for normal, immersed in water and oven heating curing conditions. In the results, it was observed an open time (15 min) and adhesion resistance (1,51 MPa) superior to the industrialized adhesive mortar (reference material) and reduced slip (15 mm) within the norm values, which shows the feasibility of applying geopolymers for the production of adhesive mortars without additives.