CREEP AND CREEP RECOVERY FOR PLAIN CONCRETE

A LABORATORY STUDY AND THE ANALYSIS OF THE CREEP AND CREEP RECOVERY CHARACTERISTICS FOR PLAIN CONCRETE ARE REPORTED. THE STUDY WAS UNDERTAKEN TO DETERMINE THE EFFECT OF (1) THE AGE OF THE CONCRETE AT THE TIME OF INITIAL LOAD APPLICATION AND THE LENGTH OF THE LOADING CYCLE, AND (2) THE CHANGE IN BEHAVIOR WHEN SPECIMENS ARE SUBJECTED TO REPEATED LOADS, ON THE TIME-DEPENDENT STRAIN BEHAVIOR OF PLAIN CONCRETE SPECIMENS SUBJECTED TO UNIAXIAL LOAD. DATA WERE COLLECTED, BOTH FOR CREEP BEHAVIOR DURING LOADING CYCLES AND CREEP RECOVERY DURING UNLOADING CYCLES, WITH THE AGE OF THE CONCRETE AND THE DURATION OF THE LOADING AND UNLOADING CYCLE AS THE PRINCIPAL VARIABLE PARAMETERS. BOTH NORMAL- WEIGHT AND LIGHTWEIGHT AGGREGATE CONCRETES WERE TESTED. IMPORTANT CONCLUSIONS OF THE STUDY ARE AS FOLLOWS: (1) THE STRAIN BEHAVIOR OF CONCRETE SUBJECTED TO ANY GIVEN LOADING HISTORY IS PREDICTABLE IF THE CREEP, SHRINKAGE, AND ELASTIC CHARACTERISTICS OF THE CONCRETE ARE KNOWN, (2) THE AGE AND STRENGTH OF THE CONCRETE AT THE TIME OF INITIAL LOAD APPLICATION IS PROBABLY THE MOST IMPORTANT VARIABLE AFFECTING THE MAGNITUDE OF CREEP STRAIN, OVERRIDING TYPE OF AGGREGATE AND ENVIRONMENTAL CONDITIONS, (3) THE CREEP STRAIN ENVELOPE FOR A GIVEN CONCRETE SUBJECTED TO A CONSTANT STRESS INTENSITY UNDER FIXED ENVIRONMENTAL CONDITIONS IS RELATIVELY UNAFFECTED BY INTERMITTENT PERIODS OF UNLOADING OF RELATIVELY SHORT DURATION, AND (4) OF THE TWO TYPES OF CONCRETE STUDIED, THE LIGHTWEIGHT AGGREGATE CONCRETE EXHIBITED GREATER CREEP STRAIN MAGNITUDES AND CONSIDERABLY GREATER SHRINKAGE. /BPR/

  • Supplemental Notes:
    • Hpr-1/6/, MHD-60-2
  • Corporate Authors:

    University of Missouri, Columbia

    1205 University Avenue
    Columbia, MO  United States  65201

    Missouri State Highway Commission

    State Highway Building
    Jefferson City, MO  United States  65101

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Pauw, A
    • Chai, J W
  • Publication Date: 1968-1

Subject/Index Terms

Filing Info

  • Accession Number: 00212033
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Apr 2 1994 12:00AM