POTENTIAL FOR RESTRAINED SHRINKAGE CRACKING OF CONCRETE AND MORTAR

While actual cracking of concrete and mortar in service depends on many variables (such as type of structure, degree of restraint, construction and curing methods, and environmental factors), a ring test can be used to determine the relative likelihood of early-age cracking of various concrete mixtures or mortars. However, standard ring test setups have provided qualitative evaluations and have not enabled a simple procedure to be established to routinely quantify the restrained shrinkage characteristics of the materials. This article reports on a study in which an instrumented ring setup is used to quantify the restrained shrinkage behavior of concrete and mortar. The setup provides a high degree of restraint while still allowing sufficient strain in the steel as the material shrinks. This test permits the cracking potential of concrete or mortar under restrained shrinkage to be classified on the basis of either how long it takes the material to crack or the rate of stress development in the material. The authors also report on a simple procedure that was developed for the preliminary assessment of cracking potential using standard values of drying shrinkage and modulus of elasticity obtained at seven days after initiation of drying.

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  • Corporate Authors:

    ASTM International

    100 Barr Harbor Drive
    West Conshohocken, PA  United States  19428-2959
  • Authors:
    • See, H T
    • Attiogbe, E K
    • Miltenberger, M A
  • Publication Date: 2003-12

Language

  • English

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Filing Info

  • Accession Number: 00986564
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 22 2005 12:00AM