Proposta de um metodo de dosagem para concreto leve/Mix desing method lightweight concrete/Propuesta de un dosificacion method for ligero concrete

There are several methodologies for Portland cement concrete dosage, among these, the method recommended by the Technological Research Institute of the State of Sao Paulo--IPTUSP, which is widespread in Brazil. Although it does not present dosage factors for lightweight concrete, this paper proposes 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%, to each "m"). The properties of the concretes were evaluated in the fresh state, through the slump test [1] and specific mass through the known volume method, and, in the hardened state, by the specific mass test [2] and compressive strength [3]. 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. Keywords: Lightweight Concrete. EPS. Mix Desing Concrete. Existem varias metodologias de dosagem de concreto de cimento Portland, entre estas, o metodo recomendado pelo Instituto de Pesquisas Tecnologicas do Estado de Sao Paulo IPT/EPUSP- bastante disseminado no Brasil. Porem este metodo nao apresenta fatores de dosagens para o concreto leve, sendo assim, este trabalho teve por objetivo propor um metodo de dosagem baseado no metodo IPT, para concretos leves com EPS. O concreto foi dosado com cimento CPV ARI, areia, EPS e agua, sendo executados dois volumes de agregados (m) fazendo-se assim um traco rico e um traco pobre, sendo eles: 1:1, 1:2 (tracos dos agregados em volume real (L) por kg de cimento), respectivamente. Em seguida, cada traco (1:m) foi dosado com tres teores diferentes de EPS (25, 50 e 75%, em relacao a cada "m"). As propriedades dos concretos foram avaliadas no estado fresco, atraves do ensaio de abatimento do tronco de cone (ABNT NBR 16889:2020) e massa especifica atraves do metodo do volume conhecido, e, no estado endurecido, pelo ensaio massa especifica (ABNT NBR 9778:2005) e resistencia a compressao (ABNT NBR