Accelerated Corrosion Test of Ceramic Recycled Gradient Concrete in Saline Soil Environment

In view of the problem that steel bar corrosion easily causes cracking of recycled concrete in saline soil area of western China,a kind of ceramic recycled gradient concrete is proposed.The polarization curves of steel bars were measured after cracking.The corrosion products of steel bars were analyzed by scanning electron microscopy (SEM) and X-ray energy spectrometry (XPS).The mass fraction of corrosion products was calculated.The volume expansion rate of corrosion products was calculated by Eighted-Averaging method.The results show that N-60 group ceramic regenerated gradient concrete has the best resistance to corrosion and expansion.The main components of steel corrosion products are Fe₃O₄,FeOOH and Fe₂O₃,which are consistent with the products under natural conditions,and the content of Fe₂O₃ in the products is the highest.Based on the polarization curves and corrosion expansion rate of steel bars after corrosion,it can be inferred that in saline soil environment,the corrosion products are mainly composed of Fe₃O₄,FeOOH and Fe₂O₃.The electric accelerated corrosion steel bar can simulate the corrosion condition in natural environment,and has good applicability.