Abstract
Bending tests were performed on concrete beams reinforced with large-sized deformed bars, designated as D64, having nominal diameter of 64mm and screw-type rolled deformation. Crack-control reinforcement D29 were arranged near the concrete surface for D64 in order to control crack widths. It was shown that the crack-control reinforcement near the concrete surface was effective for crack control of the beams. At the tensile stress of 1800kgf/cm2 of main tension reinforcement, the number of crack in the bottom surfaces of the beams increased by 1.6-1.8 times and the maximum bottom-surface crack widths of beams decreased by about 0.40 times those of the beams without crack control reinforcement. These maximum surface crack widths can be estimated by the calculation equation given in J S C E Standard Specification for Concrete Structures.
