United States Department of Transportation
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Fiber Reinforced Concrete for Bridge Deck Overlays
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2023-02-01
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Edition:Final Report (August 2021-September 2022)
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Abstract:This report reviews available research literature and reports on Fiber Reinforced Concrete (FRC) mixtures to recognize best practices of using FRC overlay mixtures and identify products with the potential of being successfully utilized in Missouri. State DOT representatives were surveyed to consolidate the current state of practice as it relates to the use of FRC, particularly for bridge decks. The survey shows that there are a variety of approaches and implementation methods from coast to coast. Also reported are the findings of a laboratory program involving evaluation of twelve fibers, representing a broad spectrum of available fiber types. Each fiber was intermixed into a representative concrete mixture at three different dosages to evaluate the performance of the recommended range. Testing was carried out for standard physical strength metrics, durability performance, and specialized FRC toughness. Additionally, the impact of fibers on restrained shrinkage cracking and tensile bond strength of FRC was evaluated. Results indicated that fibers can be introduced to concrete mixtures to obtain workable mixtures with little change to the underlying concrete mixture proportions. A generalized trend could not be established between fiber characteristics and mechanical or durability properties. Good correlation was observed between flexural toughness and fiber dosage. A noticeable difference was documented between the performance of synthetic and steel fibers when subjected to the ASTM C1609 test. The ASTM C1550 test indicated varying behaviors at different prescribed deflection levels. Restrained shrinkage testing showed the lower dosages recommended showed little improvement over the non-FRC control mixture; higher fiber dosages showed improvements in resistance to restrained shrinkage cracking. Many concerns regarding the inclusion of fibers in concrete were overcome and, if eliminated, FRC can result in mixtures with similar strength and durability characteristics to traditional non-FRC concrete with improved crack resistance. These are ideal characteristics of an overlay concrete that needs to be compliant with the underlying concrete while not reflecting through any existing cracks to prolong the life of the underlying structural concrete.
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[PDF-4.13 MB]
