Author : Dewei Meng
Release : 2020
Genre : Concrete bridges
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Nondestructive Corrosion Evaluation of Reinforced Concrete Bridge Decks with Overlays by : Dewei Meng
Download or read book Nondestructive Corrosion Evaluation of Reinforced Concrete Bridge Decks with Overlays written by Dewei Meng. This book was released on 2020. Available in PDF, EPUB and Kindle. Book excerpt: Concrete corrosion induced by deicing agents can decrease the durability of concrete bridge decks by causing cross-sectional loss of reinforcement, concrete delamination, and spalling owing to the expansion of corroded reinforcement. The installation of overlays can extend the service life of the deteriorated decks. However, overlays present challenges in the evaluation of the corrosion condition of the underlying decks. This laboratory study employed three nondestructive testing (NDT) methods to assess the effects of seven types of overlays on corrosion evaluation for concrete bridge decks. The NDT methods were electrical resistivity (ER), ground-penetrating radar (GPR), and half-cell potential (HCP). The ER method could not evaluate the corrosive environment in the concrete decks through the overlays. The GPR method could detect the corrosive environment through four of the seven overlays. The HCP method could detect the decrease of electrical potential over the actively corroded reinforcement for all seven specimens; however, only two of the seven specimens could be identified as having active corrosion per ASTM C876-15, Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete . Overlay debonding did not affect GPR and HCP testing results in this study.
