Comparação da determinação da tenacidade do concreto reforçado com fibras de aço por meio do ensaio de abertura por encunhamento e da ASTM C1609

Abstract

The general objective of the research is to analyze the mechanical behavior, focusing on the tensile strength, of concrete reinforced concrete test bodies with steel fibers, by means of the Elmar K. Tschegg patented aperture test by comparing the results with The values obtained by the method of ASTM C1609. It is also desired to evaluate the influence of the steel fiber content and the compressive strength on the composite toughness. And also contribute with a regulation and control in the application of the material. The experimental program was composed of 112 test specimens (64 cylindrical characterization, 24 prismatic for ASTM C1609 and 24 cubic for encouragement) that were tested in the Structures Laboratory of the Faculty of Civil Engineering of the Federal University of Uberlândia. All specimens were molded and assayed at least 60 days old. After the tests and analysis of the results, it is concluded that the steel fiber gives the concrete an increase in tensile toughness. The strain-hardening behavior of the concrete with a fiber content of 0.64% was also observed. The Wedge Splitting Test presents indications of reproducibility and coherence, when compared with ASTM C1609 (2012), that is, there is a correlation and it is confirmed as an alternative procedure for the technological control of the composite.