United States Department of Transportation
i
Evaluation of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests
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2023-12-01
[PDF-2.41 MB]
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Edition:Final Report
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Abstract:The aim of this document is to evaluate and compare concrete mixture designs using a granitic aggregate and employing mitigation measures. Specific measures include polypropylene fibers and shrinkage reducing admixture (SRA). Four different mixture designs were evaluated: control, addition of 8 lb/yd3 (4.75 kg/m3) of polypropylene fibers, dosage of 2% SRA by weight of cementitious material, and the combination of both mitigation methods. Two experimental approaches were carried out to assess restrained shrinkage: single-ring and dual-ring. Mechanical properties such as compressive and tensile strength were studied for each mixture. Results indicated that incorporating fibers into the mixture roughly doubles the time to cracking. Adding SRA into the mix increased the cracking age by 90%. The combination of 8 lb/yd3 (4.75 kg/m3) of fibers with 2% of SRA replacement proved to be the most effective measure for extending cracking time—improving it by an average of five times the original cracking.
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