United States Department of Transportation
i
Long-term Performance of HES Class 50AF Concrete with Polypropylene Fibers as Field-Cast Connection between Deck Bulb-T Girders in SH-36 Bridge over Bear River
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2022-09-01
[PDF-12.67 MB]
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Edition:Final Report 3/1/220 - 8/31/2022
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Abstract:Idaho Transportation Department (ITD) has been using High-Early Strength (HES) concrete Class 50AF with Polypropylene fibers in several parts of the bridge in Accelerated Bridge Construction. This material is only slightly more expensive than conventional concrete, but speeds up the construction. ITD is interested in the suitability of HES concrete in closure pours between bridge Deck Bulb-T Girders. In the first phase, an optimum HES concrete mix was identified through a series of laboratory experiments. In the second phase, field performance of the HES concrete mix was examined by placing the material in the closure pour joints between Deck Bulb-T Girders in a bridge in Idaho. The objective of the current phase (Phase 3) was to determine the 20-month field performance of the closure pour concrete in the same bridge. Tasks included six visits to the bridge site every four months to: (a) measure strain data under ITD’s Under the Bridge Inspection Truck (UBIT), (b) measure strain data under the commercial truck traffic, and (c) inspect the closure pour concrete. Based on the UBIT loading data and inspection results, it is concluded that there are no changes in the closure pour concrete in the last 20 months. Recommendations are provided.
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