ADIÇÃO DE PLUMBAGINA EM PÓ EM BLOCOS DE CONCRETO ESTRUTURAL - ANÁLISE DAS PROPRIEDADES FÍSICAS E MECÂNICAS

Abstract

Structural masonry is a widely used constructive method, this system consists of using walls as the main support structure of buildings and where loads are resistant to the foundations. The main component of this construction is the concrete block and it is extremely important that they meet the minimum quality requirements, proposed by the technical standard NBR 6136 (ABNT 2016), in order to provide safety. However, there are still many factories that, due to various factors, do not operate blocks that meet the requirements of the aforementioned standard. In view of this, the aim of this study was to analyze the quality of the blocks produced in a factory in the city of Rio Verde Goiás, and compare them with the results found with blocks with the addition of plumbagine (PG), a relatively cheap and easy access. Three traits were made, the first being a reference, with the trends originally adopted by the factory and the other two, with the addition of 0.5 and 1% of PG. Axial resistance tests, dimensional analysis and absorption were carried out, which were used to classify the blocks according to quality standards. The indices found for the blocks without addition are compared with the results found for the other traits, in order to analyze the effectiveness of the additions of PG and finally the Tukey test was performed in order to verify the difference for the results averages found in the environment resistance test. The results show that the values found for dimensional analysis and absorption are all within the requirements demanded by NBR 6136 (ABNT 2016), and the values found for these tests, the traits do not present significant differences between them. However, for the 28-day therapy resistance test, averages of 3.36 MPa were found for the reference trait (TR); 4.03 MPa for the mix with 0.5% addition of PG (T0.5) and 3.08 MPa for the mix with 1% addition (T1). At the age of 90 days, the averages of 3.23 MPa, 4.43 MPa and 3.59 MPa were found for the traits TR, T0.5 and T1, in this way TR, and T1, reached averages that fit them as Class C, already T0.5, as Class B. Despite having been proven through this study the strength of the resistance of 0.5% in the improvement of the mechanical resistance to the resistance of the blocks, it can also be verified that the increase of increment from 1% of PG reduces the mechanical strength gains. New studies must be carried out in order to detect the extent to which the addition of PG is proven to scientific materials and the reasons for the loss of resistance when the increment is used in larger proportions.