A STUDY OF CREEP IN LIGHTWEIGHT AND CONVENTIONAL CONCRETE

THIS REPORTS A LABORATORY STUDY AND THE ANALYSIS OF THE CREEP CHARACTERISTICS OF NORMAL AND LIGHTWEIGHT AGGREGATE CONCRETES. PARTICULAR INTEREST WAS GIVEN TO DIFFERENCES IN THE NATURE OF THEIR CREEP CHARACTERISTICS, THE POSSIBLE INFLUENCE OF SPECIMEN SHAPE WITHOUT SIZE INTERACTIONS, AND THE POSSIBILITY OF DEVELOPING A MATHEMATICAL MODEL TO REPRESENT CREEP OF CONCRETE UNDER ANY STRESS HISTORY FROM A SINGLE TEST. IN AN ATTEMPT TO CLARIFY THE EXISTING THEORIES FOR THE MECHANISM OF CREEP AS THEY PERTAIN TO CONCRETES OF THE TYPE TESTED, THIS STUDY HAS ENDEAVORED TO LINK MOLECULAR HYPOTHESIS AND RHEOLOGICAL MODELS WITH MACROSCOPIC OBSERVATIONS OF THE CONCRETE STRUCTURES UNDER INVESTIGATION. IT IS SHOWN THAT CREEP BEHAVIOUR MAY BE PREDICTED FROM MACROSCOPIC OBSERVATIONS BY EMPLOYING STRUCTURE PARAMETERS IN A RHEOLOGICAL MODEL. THE MODEL IS CONSTRUCTED WITH STRUCTURE COEFFICIENTS FROM STATISTICAL MECHANICS THEORY WHICH WILL PREDICT THE CREEP OF CONCRETE FROM A CONSIDERATION OF THE RESPONSE FROM A TEST OF SEVERAL SPECIMENS SUSTAINED AT LOW CONSTANT STRESS. THE PARAMETERS WHICH ARE USED IN THIS MODEL REPRESENT: (1) THE RATE OF TRANSITION OF THE GEL FROM FLUID TO SOLID, (2) THE TOTAL EXPECTED CHANGE IN THE STRUCTURE OF THE GEL, AND (3) THE PURELY ELASTIC ACTION OF THE GEL AND AGGREGATE SYSTEM. /BPR/

  • Supplemental Notes:
    • Hpr-1(3), BPR-9, FSRD C-1-63
  • Corporate Authors:

    University of Florida, Gainesville

    Gainesville, FL  USA  32611
  • Authors:
    • Cassaro, M A
  • Publication Date: 1967-1

Subject/Index Terms

Filing Info

  • Accession Number: 00212017
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Oct 23 1994 12:00AM