EFFECT OF CRACKING ON WATER AND CHLORIDE PERMEABILITY OF CONCRETE

The goal of this research was to study the relationship between cracking and concrete permeability and to support accounting for permeability and cracking resistance to other factors besides strength, as criteria to be considered in mix design to achieve a durable concrete. The effect of material composition--normal-strength concrete (NSC) and high-strength concrete (HSC) with two different mix designs--and crack width (ranging from 50 micrometers to 400 micrometers) on water and chloride permeability were examined. Cracks of designed widths were induced in the concrete specimens using a feedback-controlled splitting tensile test. Chloride permeability of the cracked samples was evaluated using a rapid chloride permeability test and the water permeability of cracked concrete was then evaluated by a low-pressure water permeability test. Uncracked HSC was less water permeable than NSC, as expected, but cracking changed the material behavior in terms of permeability. Both NSC and HSC were affected by cracking, and the water permeability of cracked samples increased with increasing crack width. Among the tested materials, only HSC with a very low water-to-cement ratio chloride permeability was sensitive with respect to cracking. Results indicate that the water permeability is significantly more sensitive than the chloride permeability with respect to the crack widths used in this study.

  • Availability:
  • Supplemental Notes:
    • Support for this research was provided by the National Science Foundation through Grant DMS/9313013 to the National Institute of Statistical Sciences.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Aldea, C-M
    • Shah, S P
    • Karr, A
  • Publication Date: 1999-8

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00767741
  • Record Type: Publication
  • Contract Numbers: DMS/9313013, HKUST 641/95E
  • Files: TRIS
  • Created Date: Aug 5 1999 12:00AM