Influence of steel corrosion to flexural behavior of coral aggregate concrete beam

To study the flexural behavior and calculation model, 8 coral aggregate concrete (CAC) beams with different types of steel were designed. The flexural behavior of CAC beam was tested. The failure mode, bearing capacity, the maximum crack width ( w s ) and average crack spacing ( l m ) were studied. A calculation model for the bearing capacity of CAC beam was proposed. The results indicated that with the steel strength increased, the cracking moment ( M cr ) and ultimate moment ( M u ) of CAC beam increased, and the development of the w s gradually slowed, which effectively inhibited the formation of cracks and improved the flexural behavior of CAC beam. For CAC structures in the ocean engineering, it is recommended to use organic new coated steel to extend its effective service life. In addition, considering the influence of steel corrosion, a calculation model for the M cr , M u , l m and w s of CAC beam was established.