Study on Carbonation and Corrosion Resistance of Reinforced Recycled Concrete

Abstract

By processing waste into recycled aggregate concrete, and producing recycled concrete aggregate with 50 percent of it replacing natural gravel, we make a study of different curing conditions on the carbonation of recycled concrete as well as the resistance capacity of steel corrosion. The experiment results indicate that the depth of carbonation of recycled concrete increases sharply with the standard curing period lowering. The recycled concrete steel corrosion resistance rate decreases as standard maintenance ages. The recycled concrete steel corrosion rate is much lower than the general concrete steel. The steel corrosion weight loss rate of general concrete is less than 0.3%, with no rusting of the steel. The steel corrosion weight loss rate of recycled concrete is mostly more than 0.3%, with apparent rusting.

Unraveling the Interplay of Physical-Chemical Factors Impacting the Carbonation Performance of Recycled Aggregate Concrete

“…The presence of SF also lessened the negative influence of the RCA, offering more similar results in RAC with respect to NAC. A similar but more moderate contribution from GGBFS was described in [ 89 , 90 , 91 ], where the carbonation rate of an RAC was reduced (about 15–25%) with the incorporation of low contents of GGBFS. In the case of GGBFS, the limited portlandite consumption of this SCM for developing microstructure seems to be an advantage over other SCMs concerning carbonation.…”