Geotinta com adição de bentonita e resíduo de tijolo cerâmico para uso em construções rurais.

Abstract

Soil is an essential natural resource that plays various ecosystem functions. In non-agricultural contexts, it stands out as a supplier of mineral material for construction, ceramics, and ecological paints, whose uses date back to human history, from rock inscriptions and artifact crafting to the body paintings of native peoples across different continents. Currently, the pursuit of innovation has driven the resurgence of soil-based paint production in response to the increasing demand for sustainable solutions. In this context, soil-based paint, known as geopaint, has been widely used. This study aimed to evaluate the performance of geopaint produced with two types of soil of different colors, combined with bentonite and brick residue, under accelerated aging conditions. The experiment used three types of ecological materials for geopaint preparation: crushed brick, grayish bank soil, and yellowish bank soil. Different formulations were developed, replacing 10% and 30% of the soil or brick residue with bentonite. The paints were applied to cement test specimens measuring 19 x 15 cm, totaling 100 samples, which were subjected to weathering resistance evaluation (directed rain exposure) and accelerated aging in an oven for 24 hours. Data were statistically analyzed using Analysis of Variance (ANOVA) and Tukey's test at a 5% significance level. The results indicated that the addition of bentonite influenced the durability of the paint, causing wear in some samples and altering its composition. However, the geopaint demonstrated satisfactory performance in terms of adhesion, finish, and durability, proving to be a sustainable and cost-effective material that adds value to rural constructions without compromising human well-being and the environment.