荷载与环境耦合作用下再生骨料混凝土梁内部开裂模式

his paper presents the experimental results of the cracking patterns inside the reinforced concrete beams with recycled aggregates (RA), under long-term coupled effects of sustained loads and chloride ion ingress. Three groups of reinforced beams were prepared with different RA replacement ratios, i.e., 0%, 50%, and 100%. Sustained loads were applied by paired anchorage of these beams, meanwhile the drying-wetting cycles with NaCl solution was applied onto these beams in pair, in order to simulate the service conditions of components serving in splash zone in marine environment. Test results show that cracks induced by both loads and steel bar corrosion occourred under the coupled effects of sustained loads and chloreide ion ingress. The width of load-induced cracks decreased linearly from the tension face of the beam towards the interior of the beams, and decreased faster in the recycled aggregate concrete (RAC) beams than in the natural aggregate concrete (NAC) beams. The width of the corrosion-induced cracks were found to increase linearly from the surface of the corroded longitudinal steel bars towards the surface of the beams, and to develop more quickly in the RAC beams.