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Full-Scale Evaluation of Low Permeability High Volume SCM Bridge Deck Concrete
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2017-08-01
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By Knight, M.
[PDF-11.70 MB]
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Edition:Final Report, May 2014 to August 2017
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Abstract:This study sought further development of low permeability mix designs each using a different SCM including silica fume, slag cement, and metakaolin. A bridge repair project consisting of two different structures was selected for full scale study of the three low permeability designs. The repair project included four phases of deck construction that allowed the use of each of the low permeability designs along with a control. These projects remained unchanged from their original design except for the concrete mix design used for the deck. Objectives of the full-scale use of the new mix designs included identification of any problems encountered by the producer or contractor (placing and finishing). Plastic and hardened properties were evaluated to validate that Class D specification requirements were achieved, and permeability testing was completed to compare performance of the low permeability mixes with the control. Field testing was completed to understand in-place permeability performance. Finally, analysis was completed to better understand the viability of surface resistivity testing for evaluation of permeability on in-place structures. Full-scale construction and testing may lead to bridge decks with increased durability, lower repair demands, increased service lives, and overall reduced cost. Also, results of field testing of permeability may lead to in-service testing without need of a sample and providing better understanding of performance and change in performance over time.
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