A NON-DESTRUCTIVE TEST FOR CONCRETE QUALITY

THE REBOUND HAMMER WHICH IS USED IN THE FIELD TO MAKE A RECORD OF THE INCREASED STRENGTH OF CONCRETE WITH AGE, IN LOCATING LOW STRENGTH AREAS, AND TO INVESTIGATE OLD STRUCTURES, IS TESTED AND EVALUATED. THE HAMMER OPERATES ON THE SIMPLE PRINCIPLE THAT A STRONG CONCRETE WILL CAUSE A GREATER REBOUND THAN A WEAKER CONCRETE WHEN STRUCK. THE REBOUND OF THE HAMMER IS PROPORTIONAL TO THE COMPRESSIVE STRENGTH OF THE CONCRETE. IT IS NOT INTENDED TO REPLACE CONTROL TEST CYLINDERS USED IN LABORATORY CONTROL TESTING NOR IS IT INTENDED TO PROVIDE AN ACCURATE DETERMINATION OF THE COMPRESSIVE STRENGTH OF THE CONCRETE. IT IS A VALUABLE TOOL FOR FIELD PERSONNEL TO DETERMINE' /1/ THE RATE OF INCREASE IN CONCRETE STRENGTH, /2/ WHEN FORMS CAN BE REMOVED AND FORCE APPLIED, /3/ WHETHER TEST CORES ARE NEEDED AND WHERE TO BE DRILLED. /4/ QUALITY OF CONCRETE IN OLD STRUCTURES AND /5/ EXTENT OF DAMAGE TO STRUCTURES CAUSED BY FIRE OR FREEZING.

  • Supplemental Notes:
    • Vol 7, No 4, PP 30-34, 6 FIG, 3 TAB
  • Authors:
    • Yachnis, M
  • Publication Date: 1966-7

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00212371
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 30 1994 12:00AM