![]() It is established as a robust and highly precise tool for fracture measurements such as crack opening and crack length. ![]() Digital Image Correlation (DIC) technique is adopted in this study to measure the cracking in concrete on the surface of the concrete specimen. ![]() Two types of concrete mixes are used with varying aggregate sizes in order to further investigate the effect of aggregate size on fracture behaviour. In the experimental study, RILEM size effect method is adopted to test geometrically similar concrete beams of various sizes. In this work, attention is paid to investigate experimentally and numerically, the relationship between crack openings and length, and the size of the specimens. Among them, we find the deterministic theory of Bazant where fracture energy is considered independent of the size and it is assumed that at peak load, the crack length is proportional to the size of the specimen. Different theories exist in the literature to describe the size effect. These parameters are frequently used to study the behaviour of concrete and to characterize the durability of structures. This effect must be taken into account in the design of the ultimate behaviour of concrete structures in order to avoid damage and crack openings. It is commonly accepted that there is a size effect on the nominal resistances of quasi-brittle materials such as cementitious materials.
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