CONTROL OF TEMPERATURE CRACKING IN CONCRETE

THE CRACKING AND CONTROL OF CRACKING ARE DESCRIBED IN MASS CONCRETE STRUCTURES. CRACKING IN THE LARGER STRUCTURES IS PREDOMINANTLY CAUSED BY VOLUMETRIC CHANGES IN THE CONCRETE DUE TO TEMPERATURE DROPS, BUT TEMPERATURE GRADIENTS WITHIN THE STRUCTURES ARE CONTRIBUTING FACTORS. THE TYPICAL LOCATIONS OF CRACKS WHICH DEVELOP IN MASS CONCRETE ARE DESCRIBED, TOGETHER WITH METHODS FOR ESTIMATING THE MAGNITUDE OF THE STRESSES WHICH CAUSED THE CRACKS. THE TEMPERATURE HISTORY OF MASS CONCRETE IS RELATED TO THE SEVERAL INFLUENCING FACTORS. EACH OF THESE FACTORS IS BRIEFLY REVIEWED, AND THE DEGREE OF CONTROL WHICH CAN BE EXERCISED BY EACH IS DISCUSSED. AMONG THOSE MEASURES WHICH MAY BE USED TO INFLUENCE AND PARTIALLY CONTROL THE TEMPERATURE RISE IN MASS CONCRETE ARE CEMENT CONTENT, TYPE OF CEMENT, USE OF POZZOLAN TO REPLACE PART OF THE CEMENT, RETARDING AGENTS, WATER CURING, USE OF LOW CONSTRUCTION LIFTS, AND ARTIFICIAL COOLING WITH EMBEDDED PIPE SYSTEMS. MEASURES WHICH MAY BE USED TO INFLUENCE AND PARTIALLY CONTROL THE PEAK TEMPERATURES IN MASS CONCRETE STRUCTURES INCLUDE ALL OF THOSE ABOVE AND, IN ADDITION, THE USE OF PRECOOLING MEASURES TO OBTAIN A DESIRED MAXIMUM CONCRETE PLACING TEMPERATURE. THE DEGREE OF TEMPERATURE CONTROL EXERCISED FOR ANY ONE STRUCTURE IS RELATED TO THE TYPE OF STRUCTURE AND ITS OVER-ALL DIMENSIONS, THE CONDITIONS ANTICIPATED DURING THE CONSTRUCTION PERIOD, AND THE DESIRED DESIGN STRESSES WHICH WILL OCCUR DURING OPERATION. THE EFFECT THAT CRACKING WILL HAVE ON THE ABILITY OF THE STRUCTURE TO PERFORM ITS FUNCTIONS SHOULD ALSO BE TAKEN INTO CONSIDERATION. DESIGN CONSIDERATIONS INCLUDE THE SIZE OF CONSTRUCTION BLOCK AND CONTRACTION JOINT GROUTING. CONSTRUCTION PROCEDURES CREATING CRACKING TENDENCIES IN CONCRETE ARE DISCUSSED AND REMEDIAL MEASURES TO REDUCE THE EFFECT OF THESE CONDITIONS ARE PRESENTED. /ACIJP/

  • Corporate Authors:

    American Concrete Institute (ACI)

    38800 Country Club Drive
    Farmington Hills, MI  United States  48331
  • Authors:
    • Townsend, C L
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00213808
  • Record Type: Publication
  • Source Agency: Am Concrete Inst Journal & Proceedings
  • Report/Paper Numbers: Title No Sp 20-7
  • Files: TRIS
  • Created Date: Sep 28 1970 12:00AM