CRACKING INDUCED BY ENVIRONMENTAL EFFECTS

WHEN CONCRETE CRACKS AS A RESULT OF ITS INTERACTION WITH ITS ENVIRONMENT AND THE CRACKING IS AN UNDESIRABLE FEATURE OF THE HISTORY OF THE CONCRETE, THE OCCURRENCE REPRESENTS THE CONSEQUENCES OF AN IMPERFECT CHOICE IN SELECTING THE PARTICULAR CONCRETE THAT WAS PRODUCED FOR SERVICE IN THE ENVIRONMENT IN WHICH IT WAS USED. SIX PHENOMENA THAT BRING ABOUT ENVIRONMENTALLY INDUCED CRACKING ARE MENTIONED: EXPANSION DUE TO THE USE OF UNSOUND CEMENT, THE ALKALI-SILICA REACTION, SULFATE ATTACK, CORROSION OF EMBEDDED METAL, FREEZING AND THAWING, AND PLASTIC SHRINKAGE. IN ALL OF THE PHENOMENA, ENVIRONMENTALLY INDUCED MOISTURE MOVEMENTS ARE PRIMARY PARTICIPANTS IN THE PHENOMENA THAT MAY CAUSE CRACKING. IN EACH CASE THE ENVIRONMENTALLY INDUCED CRACKING THAT THESE PHENOMENA MAY PRODUCE CAN BE AVOIDED BY GIVING APPROPRIATE ATTENTION TO THE PROPERTIES OF THE ENVIRONMENT AND THEIR ANTICIPATED INTERACTION WITH THE PROPERTIES OF THE CONCRETE AND THUS INCLUDING IN THE SPECIFICATIONS FOR THE WORK APPROPRIATE REQUIREMENTS FOR MATERIALS PROPERTIES, PROPORTIONS OF THE MATERIALS, AND CONSTRUCTION PRACTICES, AND BY INSURING STRICT ENFORCEMENT OF THE SPECIFICATION REQUIREMENTS SELECTED. /ACIJP/

  • Corporate Authors:

    American Concrete Institute (ACI)

    38800 Country Club Drive
    Farmington Hills, MI  United States  48331
  • Authors:
    • Mather, B
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00213807
  • Record Type: Publication
  • Source Agency: Am Concrete Inst Journal & Proceedings
  • Report/Paper Numbers: Title No Sp 20-4
  • Files: TRIS
  • Created Date: Sep 28 1970 12:00AM