Análise do chapisco com areia de britagem para sistema de revestimento argamassado: estudo de caso

Abstract

This study analyzes the feasibility of using roughcast with gravel powder in mortar coatings as a sustainable alternative to natural sand, based on a case study conducted in a residential construction project in Jataí, Goiás. The research is justified by the abundance of gravel powder in Brazil and the need to enhance sustainability practices in the construction industry. The main objective was to assess the effectiveness of roughcast with gravel powder in coating adhesion, comparing it to conventional roughcast. The methodology involved applying coatings on a wall using different roughcast mixtures: one conventional and another with partial replacement of natural sand by gravel powder. Tensile bond strength tests, conducted in accordance with NBR 13528-2 (2019), quantitatively and qualitatively evaluated the performance of the coatings, along with a detailed analysis of the execution methods employed. The results showed that neither the conventional roughcast nor the roughcast with gravel powder met the adhesion strength required by NBR 13749 (2013), indicating the need for improvements. However, gravel powder was not responsible for the unsatisfactory results, as its performance was similar to that of conventional roughcast. Additionally, a higher number of adhesive failures were observed in the roughcast with gravel powder, emphasizing the importance of further research to assess the influence of this material on such failures.