USE OF DIGITAL IMAGE CORRELATION FOR THE TESTS OF FRAGMENTED MATERIALS

An important feature in road construction is the behaviour of materials under applied load, which consequently determines the mechanisms of material degradation and the permissible range of stresses and strains to prevent a premature failure of road layers in the pavement structure.

Materials bound with binders or various non-cohesive materials are most often applied to build the structural layers of road surfaces. The nature of the used materials is crucial for the durability of a pavement structure composed of layers with different properties. Advanced measurement methods are applied to determine the properties of these materials. The article presents the results of laboratory tests on a non-cohesive material placed in a large-sized box that was gradually loaded. In order to optimize design solutions, the behaviour of the tested material under load was analysed using a modern digital image correlation technique.