Synthesis of DOT Use of Beam End Protection for Extending the Life of Bridges

Synthesis of DOT Use of Beam End Protection for Extending the Life of Bridges

15 Pages · 2014 · 899 KB · English

that have been proven to extend the life of new and existing concrete and steel bridge beams. A comprehensive along with online surveys and phone interviews of State department of transportations (DOTs) and coating manufacturers was Bridges, and Transit: Conditions and Performance (2010)).

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Synthesis of DOT Use of Beam End Protection for Extending the Life of Bridges Aleksandra Radlin´ ska 1),*, Leslie Myers McCarthy 2), James Matzke 2), and Francis Nagel 2) (Received October 28, 2013, Accepted May 3, 2014) Abstract:As the national transportation infrastructure ages and deteriorates, many existing bridges require frequent and costly maintenance and repairs The objective of this work was to synthesize new and existing types of beam end coatings and treatments that have been proven to extend the life of new and existing concrete and steel bridge beams A comprehensive literature review, along with online surveys and phone interviews of State department of transportations (DOTs) and coating manufacturers was conducted to gather information about existing and recently developed technologies The study revealed that while many promising coatings and treatments are offered on the market, there is a lack of readily available laboratory results that would enable direct comparison of the available methods This finding applies in terms of the coatings’ durability and the potential for extending the service life of existing bridges Most of the interviewed State DOTs’ personnel assessed the products listed in respective DOT’s Qualified Products Lists as performing ‘well’ However, there was significant variability between states in the type of the products used Among the agencies contacted, none was able to suggest the most promising or advanced products, either for concrete or steel bridge beam end treatments This suggests that comprehensive laboratory evaluation would be necessary for selecting the best available beam end treatments and coatings Keywords:bridge beam ends treatments, structural deterioration, coatings 1 Introduction The condition of aging infrastructure in the United States has been an elevated concern for many years The National Academy of Engineering included the restoration and improvement of urban infrastructure on the list of the top 14 Engineering Challenges facing society (Grand Challenges for Engineering2012) The condition of the infrastructure could be significantly improved if restoration and repairs on the existing infrastructure components, and especially bridges, were implemented A review of recent National Highway System (NHS) Bridge Deficiencies data that span over the recent decade (Table1) reveals that approximately 82 % of NHS bridges were classified as structurally defi cient with the number consistently recorded to be above 8 % over the recent decade (Status of the Nation’s Highways, Bridges, and Transit: Conditions and Performance (2010)) The cost of repairs of existing prestressed concrete Ibeams has been reported to range from 35 to 69 % of thecost of a superstructure replacement and is expected to extend the service life of a structure, along with replacing the deck joint (Needham and Douglas2000) Bridge beam ends are specifically prone to corrosion and premature deteriora tion, typically due to bridge deck joint leakage (Ahlborn et al2002) As such, one way to enhance the current con dition of bridges is to provide coatings or treatments to the existing and newly constructed bridge beams ends The objective of this work was to evaluate existing methodolo gies and materials that have been proven to extend the life of new and existing concrete and steel bridge beams The first part of the paper discusses protection systems of concrete bridge element, while the second part of the paper focuses on steel beam end treatments Since majority of bridge beam constructed in the US are made out of concrete, more emphasis is placed on concrete protection systems 2 Literature Review of Products and Systems to Protect Concrete Bridge Elements Among the existing systems that extend the service life of concrete structures, coatings, sealers, overlays, electro chemical methods, corrosion inhibitors, admixtures, patch ing, reinforcing steel protection, membranes, and a combination of treatments can be mentioned The ACI Concrete Repair Guide (ACI Committee 546 Concrete Repair Guide ACI 546R961996), for example, 1)Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA *Corresponding Author; Email: [email protected] 2)Department of Civil and Environmental Engineering, Villanova University, Villanova, PA 19085, USA CopyrightThe Author(s) 2014 This article is published with open access at Springerlinkcom International Journal of Concrete Structures and Materials Vol8, No3, pp185–199, September 2014 DOI

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