SELECTION OF CEMENTS WITH VIEW TO REDUCING THE LIKELIHOOD OF CRACKING IN CONCRETE PAVEMENTS /IN FRENCH/

AN INVESTIGATION IS MADE INTO CONDITIONS WHEN CRACKING OCCURS AFTER THE SAWING OF JOINTS, E.G. AFTER THE CONCRETE HAS SUFFICIENTLY HARDENED TO ENABLE SAWING TO BE CARRIED OUT WITHOUT CAUSING SPALLING OF THE EDGES OF THE JOINT OR LOOSENING OF THE AGGREGATES. THESE CONDITIONS ARE A FUNCTION OF A NUMBER OF FACTORS, IN PARTICULAR THE ACTION OF THE INGREDIENTS. AN EXPERIMENT WAS CONDUCTED IN FRANCE IN WHICH SEVERAL SECTIONS OF THE SAME MOTORWAY WERE SIMULTANEOUSLY BUILT, WITH SIMILAR CONSTRUCTION METHODS AND UNDER IDENTICAL CLIMATIC CONDITIONS. RESULTS SHOW MARKED VARIATIONS IN SAWING CONDITIONS: FOR SOME CONCRETES, A CONSIDERABLE LENGTH OF TIME ELAPSED BETWEEN THE SAWING OF THE JOINTS AND APPEARANCE OF CRACKS WHILE, FOR SOME OTHER, CRACKING OCCURRED VERY SOON OR SOMETIMES IMMEDIATELY AFTER SAWING, THIS SEEMS TO POINT OUT TO THE INFLUENCE OF CEMENT ON THE BEHAVIOUR OF CONCRETE. TWO SERIES OF INVESTIGATIONS WERE CARRIED OUT AT THE L.C.P.C. IN PARIS: (1) EVALUATION OF THE BEHAVIOR OF CEMENT PASTE THE FIRST TWO DAYS AFTER MIXING FROM THE POINT OF VIEW OF SHRINKAGE, AND (2) MEASUREMENT OF THE TENSILE STRENGTH AND RESISTANCE TO DEFORMATION OF FRESH MORTAR. RESULTS SEEM TO INDICATE THE INFLUENCE OF SOME MINERAL INGREDIENTS IN CEMENT, IN PARTICULAR TRICALCIUM ALUMINATE; A HIGH TRICALCIUM ALUMINATE CONTENT INCREASES THE RATE OF SHRINKAGE AND BRITTLENESS OF YOUNG MORTAR. /LCPC(A)/RRL/

  • Supplemental Notes:
    • Vol 1, pp 23-40, 6 FIG, 4 TAB, 8 PHOT, 5 REF
  • Corporate Authors:

    European Cement Association /France

    ,    
  • Authors:
    • Baron, J
    • Brachet-rolland
    • Pidoux, J C
  • Publication Date: 1969-7

Subject/Index Terms

Filing Info

  • Accession Number: 00213068
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: May 16 1971 12:00AM