Evaluation of Corrosion Degradation Law of Recycled Reinforced Concrete in Saline Soil Under Electrified Environment

Abstract

In order to investigate the corrosion mechanism of recycled reinforced concrete (RRC) under harsh environments, four recycled coarse aggregate (RCA) contents were selected, and saline soil was used as an electrolyte to perform electrified accelerated corrosion experiments. The relative dynamic elastic modulus and relative corrosion current density were considered to describe the deterioration law of the RRC in saline soil. The results indicated that as the energization time increased, the corrosion current density, corrosion potential, and polarization resistance of the steel bar decreased gradually. Compared with ordinary reinforced concrete, when the RCA content was 30%, the ability of the RRC to resist corrosion was improved slightly; however, when the RCA content exceeded 30%, the corrosion resistance of the RRC deteriorated rapidly. Scanning electron microscopy revealed that for a dense RRC, less corrosion products were generated in the pores inside the concrete and on the surface of the steel bar. X-ray diffraction results indicated that SO₄ ²⁻ can generate ettringite and other corrosion products, along with volume expansion. The main corrosion products generated on the surface of the steel bars included Fe₂O₃, Fe₃O₄ and FeO(OH), which were the corrosion products generated by steel bars under natural environments. Therefore, using saline soil as an electrolyte is more consistent with the actual service environments of RRC. Both the relative dynamic mode and relative corrosion current density of the degradation parameters conform to the Weibull distribution; furthermore, the relative dynamic mode is more sensitive and the corresponding reliability curve can better describe the degradation law of RRC under saline soil environments.

Keywords

recycled aggregate concrete / corrosion mechanism / saline soil / accelerated corrosion / durability evaluation parameters

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