Control of Concrete Cracking in Bridges (2017) / Chapter Skim
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Pages 88-100
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88 Appendix B Summary of Responses to Survey Questionnaire This appendix contains a summary of the responses to the questionnaire. Only those agencies that submitted responses to the questions are listed.
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89 2. Which of the following types of concrete cracking has your agency experienced in the past five years on bridges with steel beams?
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90 Agency Lessons Learned Oklahoma ODOT participated in the University of Kansas pooled research on crack free bridge decks http://www.concretebridgeviews.com/i78/Article2.php Oregon OSU State Research Report 728. This research developed shrinkage limits to reduce deck shrinkage.
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91 If your agency has modifications or design practices to supplement Article 5.7.3.4, what are they?
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92 Agency Other Strategy or Special Use Iowa Require retarding admixture to maintain concrete plasticity during beam/girder deflection when continuous placement. Kansas A minimum strength and cement content is not intended to limit cracking.
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93 8. What strategies to minimize cracking in full-depth cast-in-place concrete bridge decks have been least effective?
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94 11. What is the frequency of use of the following admixtures for cast-in-place concrete bridge decks?
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95 Wisconsin 502.3.8.2.3 Decks (1) For structures under 100 feet in length, cure the concrete in decks, medians, and sidewalks for at least 7 days with polyethylene-coated burlap or other coated material conforming to 501.2.9.
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96 State Effect California None Iowa We have only built a handful of bridge with galvanized reinforcing. Most of the bridges were built in the 1970s.
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97 18. Has your agency used ASTM A1035 reinforcement in bridge decks based on a yield strength of 100 ksi for design?
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98 If "No," what criteria are used for substructures? Agency Criteria Florida See SDG 3.10.A vs.
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99 Agency Type of Cracking New Hampshire We normally have 4" weep holes in our abutments 10' on center and have experienced vertical shrinkage cracking at those locations. New York NYSDOT is experiencing some shrinkage and temperature cracking on abutments and wing walls.
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100 Agency Research in Progress Utah Contact UDOT Research Virginia Study of decks cast using special "low cracking deck concrete" specification Wisconsin WHRP Project 0092-15-01Precast/Prestressed Concrete Bridge Girder Cracking Phase II Ontario Our agency is funding research at University of Toronto to look at evaluating the cracking potential of high performance concrete mixes. We would like to be able to prequalify high performance mixes for use in bridge deck applications, to avoid excessive cracking.
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