A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Concrete Bridge Deck Overlays and HMA Bridge Deck Overlays with Waterproof Membranes
When a bridge deck is in need of rehabilitation, a concrete overlay, an HMA overlay, or an HMA overlay with an underlying waterproof membrane are all rehabilitation options. The purpose of the latter system is to prevent water and other deleterious materials from seeping through cracks in the concrete bridge deck. In 1994, the Wisconsin DOT began an evaluation of bridge decks overlaid with concrete and with HMA over a waterproof membrane. Both types of overlays demonstrated good performance and remained in service for up to 20 years. Proper installation of the waterproof membrane and HMA overlay was critical to long‐term performance. In the time since this research study was initiated, Wisconsin guidelines have evolved, and use of HMA overlays with waterproof membranes is no longer specified for bridge deck rehabilitation on the Wisconsin State Trunk Network. Concrete bridge deck overlays are typically constructed. Polymer modified asphaltic overlays and micro‐silica overlays are also constructed as experimental alternatives to concrete overlays. Standard special provisions for construction of HMA overlays with waterproof membranes exist if this rehabilitation option is reinstituted in the future.
Evaluation of Concrete Bridge Deck Overlays and HMA Bridge Deck Overlays with Waterproof Membranes
When a bridge deck is in need of rehabilitation, a concrete overlay, an HMA overlay, or an HMA overlay with an underlying waterproof membrane are all rehabilitation options. The purpose of the latter system is to prevent water and other deleterious materials from seeping through cracks in the concrete bridge deck. In 1994, the Wisconsin DOT began an evaluation of bridge decks overlaid with concrete and with HMA over a waterproof membrane. Both types of overlays demonstrated good performance and remained in service for up to 20 years. Proper installation of the waterproof membrane and HMA overlay was critical to long‐term performance. In the time since this research study was initiated, Wisconsin guidelines have evolved, and use of HMA overlays with waterproof membranes is no longer specified for bridge deck rehabilitation on the Wisconsin State Trunk Network. Concrete bridge deck overlays are typically constructed. Polymer modified asphaltic overlays and micro‐silica overlays are also constructed as experimental alternatives to concrete overlays. Standard special provisions for construction of HMA overlays with waterproof membranes exist if this rehabilitation option is reinstituted in the future.
Evaluation of Concrete Bridge Deck Overlays and HMA Bridge Deck Overlays with Waterproof Membranes
I. Battaglia (author) / J. Peters (author)
2012
17 pages
Report
No indication
English
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