United States Department of Transportation
i
Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa [Tech Transfer Summary]
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2016-05-01
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[PDF-736.89 KB]
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TRIS Online Accession Number:1603601
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Abstract:Using saturated lightweight fine aggregate (LWFA) in concrete mixtures can replenish water that is depleted during cement hydration without influencing the water-to-cement (w/c) ratio. This process, known as internal curing (IC), can contribute to a more sustainable infrastructure by reducing shrinkage, increasing strength, lowering permeability, and providing other benefits. As a result, the service life of concrete structures can be increased and the required cement content may be reduced. These benefits are most useful in bridge decks that are exposed to aggressive environments and are at a high risk of cracking. It is reported that inclusion of about 20 to 30% LWFA will not only improve strength development and potential durability, but, more importantly, will significantly reduce shrinking, thus reducing cracking risk. The aim of this work was to investigate the feasibility of such an approach in a bridge deck. The objectives of this work were as follows: Evaluate the performance of LWFA concrete through laboratory and field testing; Evaluate the structural performance of a concrete bridge deck made using LWFA through live load tests of the finished structure at the time of construction and after one year and two years of service; Conduct a lifecycle cost and service life prediction.
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