Development Of A Shrinkage Performance Specifications And Prediction Model Analysis For Supplemental Cementitious Material Concrete Mixtures

As concrete cures and dries, tensile stresses are created due to hydration and loss of moisture. This article reports on a study that assessed the unrestrained shrinkage and the restrained cracking tendency of concrete mixtures typically used by the Virginia Department of Transportation (VDOT). The authors were trying to establish an appropriate limit on drying shrinkage for use in a performance specification. Five existing shrinkage prediction models were assessed to determine the accuracy and precision of each model as it pertains to the VDOT mixtures used in this study. The five models assessed were the ACI 209 Code Model, Bazant B3 Model, CEB90 Code Model, Gardner/Lockman Model, and the Sakata Model. The authors conclude that the Gardner/Lockman Model performed best for the supplemental cementitious material (SCM) mixtures (those include fly ash and slag cement). The authors also conclude that the potential for cracking could be minimized by limiting the unrestrained shrinkage of the concrete mixtures. The recommended percentage length change specification limits for the supplemental cementitious material mixtures are 0.0400 at 28 days and 0.0500 at 90 days.

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  • Authors:
    • Mokarem, David W
    • Weyers, Richard E
    • Lane, D Stephen
  • Publication Date: 2005-5


  • English

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  • Accession Number: 01001311
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 27 2005 12:41PM