Shape of corrosion-induced cracks in recycled aggregate concrete

This study investigated four groups of reinforced concrete specimens with different replacement percentages of recycled aggregate (RA). The corrosion-induced crack development in the concrete cover was investigated with a digital microscope, and the total circumferential crack widths at different radii were measured. A linear model was adopted to describe the variation of the crack width along the radial direction in the recycled aggregate concrete (RAC). The corrosion-induced crack shapes of normal concrete and RAC were schematically described. The employment of RA in the concrete mixture results in a wider-opening crack shape.