Experimental Study On Durability Of Recycled Concrete Structure Exposed In Corroded Environment

Compared with conventional reinforced concrete structure, recycle aggregate concrete (RAC) structure has the potential huge advantage on saving natural building stones resources, protecting environment and good economy because of effective usage of the waste concrete material in RAC structure. The degradation of material properties of RAC and steel bar exposed to corrosive environment will certainly lead to gradual decline in resistance and reliability of RAC structure. From the domestic and overseas research literatures nowadays, the relative research on durability of RAC structure has been rarely reported. So, the study on durability of RAC structure has a vital realistic and engineering significance for us.In order to investigate the damage evolution process and laws of RAC structure, the experiment was performed. The focus was the RAC durability and bond durability between RAC and steel bar in sulfate or freeze-thaw cycles corrosive environment. Considering the factors of corrosion condition and RAC material, the durability decay models were established by the application of damage theory and attenuation function, which is effective to achieve the initial the goal of damage prediction of RAC structure. Meanwhile, based on the time-variant reliability theory and the testing results, the time-variant reliability model of bending capacity of RAC beam was established, considering the changes of RAC strength, bond performance and geometric parameter. This conclusion can provide some effective references for the application and reliability assessment of RAC structure in road, bridge, tunnel and housing construction.