Life Cycle Assessment of an Innovative Hybrid Highway Bridge Made of an Aluminum Deck and Glulam Timber Beams

• Published in: Buildings (Basel) 2022-10, Vol.12 (10), p.1616
• Main Authors: Beudon, Camille, Oudjene, Marc, Djedid, Amar, Annan, Charles-Darwin, Fafard, Mario
• Format: Article
• Language: English
• Subjects: Aluminum; aluminum deck; Atmospheric corrosion; Beams (structural); Bridge decks; Bridges; Competitive materials; Concrete; Concrete slabs; Construction; Costs; Decks & patios; Design; Environmental impact; Girder bridges; Girders; Glulam; glulam timber beams; Highway bridges; Impact analysis; Life cycle analysis; Life cycle assessment; Life cycles; Nonrenewable resources; Quebec climate; Recyclability; Rehabilitation; Reinforced concrete; Reinforcing steels; Renewable resources; Roads; Roads & highways; Steel; Steel bridges; Sustainable yield; Timber; Timber (structural); Wood; Wood construction; Wooden bridges
• ISSN: 2075-5309; 2075-5309
• DOI: 10.3390/buildings12101616

Reinforced concrete and steel are the most commonly used materials in bridge applications in Quebec (Canada). The production of these materials has a significant environmental impact and contributes to the scarcity of non-renewable resources due to the numerous maintenance requirements during the life of the structure. Consequently, there are governmental initiatives and efforts in the province of Quebec to promote the use of aluminum and engineered wood in the construction and rehabilitation of roadway bridges. Those two materials are not widely used due to the short-term vision of decision makers and the lack of technical knowledge for structural uses in highway bridge structures. However, they can be competitive materials due to their local production, durability and recyclability. The life cycle assessment method allows for an analysis of the use of complementary materials, considering all the stages of the life cycle of a structure. The comparison of a roadway bridge made of an aluminum deck on glulam timber beams against a bridge made of an aluminum deck on steel girders shows that, due to the local production and low environmental impact of glulam timber, the aluminum-to-timber bridge is economically and environmentally more advantageous than the aluminum-to-steel bridge. Similarly, a comparison of this alternative aluminum/wood solution to the conventional concrete slab-on-steel girder bridge solution shows a decrease in overall cost by 86% and a decrease in environmental impacts by 88% due to the ease of prefabrication and the relatively low number of interventions over its lifetime.