Concrete modulus of elasticity assessment using digital image correlation

Abstract

This paper presents the use of the technique of digital image correlation for obtaining the elasticity modulus of concrete. The proposed system uses a USB microscope that captures images at a rate of five frames per second. The stored data are correlated with the applied loads, and a stress-strain curve is generated to determine the concrete compressive modulus of elasticity. Two different concretes were produced and tested using the proposed system. The results were compared with the results obtained using a traditional strain gauge. It was observed a difference in the range of 4% between the two methods, wherein this difference depends on some parameters in the case of the DIC results, as focal length and a video capture resolution, indicating that DIC technique can be used to obtain mechanical properties of concrete.

RCC Structural Deformation and Damage Quantification Using Unmanned Aerial Vehicle Image Correlation Technique

“…The data acquisition platforms, such as digital cameras and terrestrial laser scanners are fixed on tripods that remain immovable facing perpendicular (90 ± 7) to the object in a particular location [10]. The data obtained from different angles of the target object produces oblique images that abruptly end up yielding inaccurate displacement results [16,17]. In spite of its impressive accuracy and unique capabilities for investigating the structural strains under dynamic phenomena, DIC is limited to only a few applications in SHM due to a fixed platform [18].…”

Contribuição Dos Mecanismos Resistentes À Força Cortante Em Vigas De Concreto Armado Sem E Com Fibras De Aço

“…Em variadas aplicações em corpos-de-prova de concreto, a técnica óptica de CID tem se mostrado confiável (Choi & Shah, 1997;Fayyad & Lees, 2014;Santos et al, 2016;Cavagnis et al, 2015Cavagnis et al, e 2018aetc.). Uma das formas de se estimar de maneira aleatória a qualidade (precisão e acurácia) das informações geradas pelo software de correlação de imagens é por meio da comparação entre duas imagens O desvio de fase da imagem refere-se a movimentos da imagem que não correspondem à realidade, que podem chegar a ± 0,4 pixel (Luo et al, 2001).…”