Materials Performance

NOV 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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27 MATERIALS PERFORMANCE: VOL. 57, NO. 11 NOVEMBER 2018 Continued on page 29 COATINGS & LININGS ESSENTIALS D eFelsko Corporation l O gdensburg, N ew Yor k USA Tel: + 1-315-393-4450 l Email: techsale@defelsko.com LPD 1-800-448-3835 www.defelsko.com Low voltage Pinhole Detector D etects holidays, pinholes and other discontinuities on metal and concrete substrates n Lightweight, ergonomic design to fit comfortably in t he hand with a balanced weight distribution n 4 voltage outputs conform to international standards n Automatic self-test verifies voltage calibration n G roundSense™ visibly reassures the user that the instrument i s properly grounded n Weatherproof, dustproof and shockproof — meets or exceeds IP65 n Long For m Certificat e of Calibrat ion included Select from 2 Kit options: B asic — includes everyt hing needed for detecting pinholes using a rectangular sponge wand C omplete — includes the Basic Kit , adapt able sponge hardware and extension accessories C omplete Kit NEW NEW Australia's Darlington Upgrade Project Roads and bridges are threatened by corro- sion and degradation as they are continu- ously exposed to climatic elements and vi- bration from vehicle movements. e cost of corrosion mitigation to national econo- mies around the world is estimated to be billions of dollars every year. e impact can be both economic through the cost of repairs and maintenance as well as a physi- cal threat to workers, the public, and even other nearby structures. One of the two main ways to protect an asset from corro- sion is to physically isolate a structure from the environment by applying a protective coating. Protection of the various structural ele- ments was integral to the design of Austra- lia's Darlington Upgrade Project. e proj- ect is another important stage in the delivery of Adelaide's North-South Corridor and will deliver an upgrade of ~3.3 km of the existing Main South Rd. e $620 mil- lion project is jointly funded by Australian and state governments ($496 million feder- ally funded and $124 million state funded) and is due to be completed in 2019. ree of the eight bridges constructed for the project consisted of a steel box- girder design with reinforced concrete decks. Half of the girder sections for these structures were constructed by Haywards Engineering in Tasmania, with McElligott's then responsible for applying a protective corrosion-resistant coating to the girders. e 22 coated bridge girder sections weighed more than 1,300 tons in total. e other half of the girders were constructed and coated by Bowhill Engineering in South Australia. According to Ivan Berry, general man- ager at McElligott's, each girder was manu- factured and delivered to the company's workshop. "Our facility is a continuous cov- ered line where structures to be coated are profiled, primed, and coated," Berry says. Each girder section was abrasive blasted to blasting standard NACE No. 2/SSPC-SP 10/ Sa 2 1/2. 1 Profiling a substrate produces an even-textured surface that increases the adhesion of a coating. Once profiled, the girders moved down the line where they were primed and then had two layers of topcoat applied. Jeremy Hawkes, managing director of Bowhill Engineering, concurred that mov- ing the 48-m by 4-m high units of open top box girder within their facility was a chal- lenge. Abrasive blasting and painting in the same facility produced its own difficulties. "For that size structure, we used a lot of abrasive garnet to profile the steel. e used

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