Proposta de um método de dosagem para concreto leve

Abstract

There are several methodologies for Portland cement concrete dosage, among these, the method recommended by the Technological Research Institute of the State of São Paulo - IPTUSP, this is widespread in Brazil. Although it does not present dosage factors for lightweight concrete, therefore this paper aims to propose a dosage method based on the IPT method for lightweight concrete with EPS. The concrete was dosed with CPV ARI cement, sand and EPS, and two volumes of aggregates (m) were made, thus making a rich and a poor trace, For this, two aggregate contents (m) were executed, thus making a rich and a poor mix, being them: 1:1, 1:2 (aggregates mix in real volume (L) per kg of cement), respectively. Then, each mix (1:m) was dosed with three different levels of EPS (25, 50 and 75%, in relation to each "m"). The properties of the concretes were evaluated in the fresh state, through the slump test (ABNT NBR 16889:2020) and specific mass through the known volume method, and, in the hardened state, by the specific mass test (ABNT NBR 9778:2005) and compressive strength (ABNT NBR 5739:2018). With the results obtained from this study, it was possible to elaborate a dosage diagram for each “m” analyzed, obtaining the values of the EPS content, projection of compressive and slump resistance, indicated in a dosage abacus made from the test results, these parameters are essential for the determination of the concrete mix.