Análise de imagens para determinação da quantidade de fibras presentes no concreto

Abstract

This work aims to estimate the amount of fibers present in cylindrical concrete specimens, 100 mm in diameter and 200 mm high, reinforced with steel fibers, using the digital image processing of the cross sections of the specimens. The experimental program consisted of the production of 192 specimens from three different levels of steel fibers (20 kg / m³, 30 kg / m³ and 40 kg / m³). fiber content. Of these, 32 were still demoulded in the fresh state and the fibers were separated and 32 were cut crosswise to obtain images of the sections. The estimation of the amount of fibers present in the concrete was carried out using a programming routine developed in MatLAB environment, which allows the analysis of the digital image of the cross section of the specimen, identifying and segmenting the fibers present. The estimated values for the amount of fibers using the image processing were compared with the quantities obtained in the demoulding of the specimens in the fresh state. The results for the estimation using the PDI were satisfactory, there was no significant variation for the two forms of fiber volume estimates.