SHRINKAGE AND THERMAL CRACKING IN A REINFORCED CONCRETE RETAINING WALL

STRAIN READINGS HAVE BEEN TAKEN WITH A DEMEC GAUGE OF 3 FT GAUGE LENGTH FOR TWO YEARS ON A REINFORCED CONCRETE COUNTERFORT TYPE RETAINING WALL. ATTEMPTS WERE MADE TO ISOLATE THERMAL STRAINS FROM SHRINKAGE STRAINS BY TAKING MEASUREMENTS ON SPECIALLY CAST CONTROL BLOCKS SUITABLE SEALED AGAINST LOSS OF MOISTURE. THE RESULTS INDICATED THAT THE THERMAL MOVEMENTS IN THE WALL, WHICH WERE FAR GREATER THAN THE SHRINKAGE MOVEMENTS, WERE THE PRIMARY CAUSE OF CRACKING. THE CRACKS NEARLY ALWAYS OCCURRED AT ALL VERTICAL CONSTRUCTION JOINTS. IT IS EVIDENT THAT THERMAL EFFECTS HAVE A FAR GREATER INFLUENCE ON THE CRACKING BEHAVIOR OF REINFORCED CONCRETE STRUCTURES THAN HAS GENERALLY BEEN RECOGNIZED IN THE PAST. A GENERAL THEORY FOR ALL THE CRACKING BEHAVIOR OF LIGHTLY REINFORCED AND LIGHTLY LOADED REINFORCED CONCRETE MEMBERS HAS BEEN DEVELOPED. THIS THEORY EXPLAINS THE ERRATIC BEHAVIOR WHICH IS OFTEN EXPERIENCED IN PRACTICE, AND CAN BE USED TO DESIGN TO THE LIMIT STATE FOR MAXIMUM DESIRABLE CRACK WIDTH. /RRL/A/

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Filing Info

  • Accession Number: 00212830
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Sep 9 1970 12:00AM