2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Mr. Kevin Williams, Atlantic Industries Ltd
Mr. Phil Carroll, Atlantic Industries Ltd
Buried bridges constructed of corrugated aluminum structural plate are a lightweight, economical and environmentally friendly solution to traditional bridges in many applications up to spans of 16 m. Aluminum structural plate resists corrosion, impact and scratches as a result of the spontaneously forming oxide layer. This oxide layer, alumina (Al2O3), is dense and adheres well to the aluminum alloy substrate when exposed to oxygen carrying environments, such as water or atmosphere. While aluminum structural plate has been on the market for over 50 years, there are many uncertainties in industry regarding appropriate environments, capabilities and durability. The objective of this paper is to address those uncertainties by building on previously published literature with conducted laboratory testing and field inspections of existing structures. Results of the laboratory testing on aluminum structural plate substantiated previously documented claims of resistance against salt spray and abrasion. These results were again reflected during the field inspections in various environments (soft water, brackish water, applications utilizing deicing salts, low to moderate abrasion, etc.). While not appropriate for all applications, aluminum structural plate is suitable for roadways utilizing deicing agents in winter months, soft water, brackish water and moderately abrasive conditions. The outcome of this paper is a best practices guideline for the use of aluminum structural plate. The guideline quantifies appropriate environments for aluminum structural plate as well as design and installation practices for various applications.