Expanding the Informational Catalog of TDOT Low Permeability Bridge Deck Mixtures
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2015-01-04
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Edition:May 15, 2013 to May 14, 2018
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Abstract:Building on the success of RES 2011-09 Development of a TDOT Class D-LP (Lower Permeability) Concrete Mixture, a study was conducted to expand the Tennessee Department of Transportation (TDOT) informational catalog of concrete mixtures that have a high probability of meeting the proposed new 1,200 coulomb specification. Four examples of lower rapid chloride permeability (RCP) concrete mixture designs for Tennessee bridge decks were developed and tested. All materials used in the new lower RCP mixtures are widely available in Tennessee. The four mixtures were: 1. 5% silica fume and 25% Class C fly ash substitution for portland cement 2. 5% metakaolin and 25% Class C fly ash substitution for portland cement 3. 35% slag and 15% Class F fly ash substitution for portland cement 4. 3% metakaolin and 35% Class F fly ash substitution for portland cement Eleven batches of each mixture were produced. The plastic and hardened properties of all batches of all mixtures met TDOT 604.03 Class D requirements. Further, the hardened properties of all mixtures were similar to, or superior to, a typical TDOT Class D mixture from RES 2010-07. The mean RCPs of all four mixtures were significantly lower than 1,200 coulombs at 56 days at the 5% significance level. The authors further recommend that TDOT continue the development of an informational catalog that provides examples of concrete mixtures that have a high probability of meeting the proposed new specification. The catalog would not be a recipe book or a complete list of mixtures that could meet the specification, but would rather provide laboratory-tested ideas for experienced mixture designers attempting to produce concrete mixtures that meet the proposed new specification.
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