Formation of a complete stress-strain curve of concrete using digital image corellation

This paper reports the development and verification of a new procedure for formation complete stress-strain curve concrete with downward region strain by using digital image correlation method. A technique to build spectle patterns on surface is described. That makes it possible accurately enough reproduce perform high-quality analysis strains involving correlation. The advantages this research have been established when predicting internal cracks in followed their propagation. In addition, methodology obtain entire studied plane sample at each stage loading. provides an opportunity investigate change movement individual points or areas studying surfaces. relevant issue as enables more detailed diagnostics existing reinforced structures. To check accuracy application, mechanical gauge 0.001 mm was additionally installed. 2 high-speed monochrome CCD cameras different lenses were used determining technique. deformations controlled period time every 250 ms. load additional third camera speed 50 frames/second. result experimental study formed full destruction diagram strain. deviation results based base 200 from those acquired mainly up 10 %, which confirms reliability results. work allow accurate calculation structures practice design, inspection, reinforcement