Experimental investigations of strain localization in concrete using Digital Image Correlation (DIC) technique

The paper presents results of experimental investigations of strain localization in concrete using a non-destructive method called Digital Image Correlation (DIC) technique. This technique measures surface displacements from digital images. The model tests were carried out with notched concrete specimens under three-point bending. Three dierent beam sizes and two dierent concrete mixes were used. During experiments, load‐deflection curves and evolution of fracture process zone were determined. The measured size eect in strength was compared with the deterministic size eect law by Bazant (1984) and experimental results by Le Bell´ ego et al (2003).