IMPACT AND PENETRATION TESTS OF PORTLAND CEMENT CONCRETE

TESTS USING A REBOUND DEVICE (SCHMIDT HAMMER) AND A PENETRATION DEVICE (WINDSOR PROBE TEST SYSTEM) WERE PERFORMED AT 4 AGES ON MORTAR SPECIMENS AND ON CONCRETES MADE WITH 3 COARSE AGGREGATES AND WITH 2 MAXIMUM SIZES OF AGGREGATE. CYLINDERS, 6 BY 12 IN., ALSO WERE CAST AND TESTED AT THE SAME AGES. COMPARISONS OF THE TEST METHODS WERE MADE OF THEIR ABILITY TO DETECT SIGNIFICANT DIFFERENCES IN BATCHES OF CONCRETE, AGGREGATES, SIZES OF AGGREGATES, SUCCESSIVE AGES OF CONCRETE, AND TOP AND BOTTOM OF TEST SLABS. RESULTS SHOWED THAT MORE SIGNIFICANT DIFFERENCES AMONG CONCRETE SPECIMENS WERE DETECTED BY THE CYLINDER TESTS THAN BY EITHER HAMMER OR PROBE MEASUREMENTS. BASED ON THIS STUDY AND OTHERS, IT APPEARS THAT, ALTHOUGH BOTH THE SWISS HAMMER AND THE WINDSOR PROBE TEST SYSTEM SHOW A CORRELATION WITH COMPRESSIVE STRENGTH, NEITHER IS SUFFICIENTY PRECISE TO GIVE ACCURATE COMPRESSIVE STRENGTH VALUES. EITHER INSTRUMENT CAN BE USED TO INVESTIGATE RELATIVE QUALITY OF DIFFERENT AREAS OF CONCRETE AND TO SURVEY AREAS OF DETERIORATED CONCRETE. THE SWISS HAMMER, HOWEVER, IS CHEAPER THAN THE WINDSOR PROBE TEST SYSTEM, LESS DESTRUCTIVE TO THE CONCRETE SURFACE, AND CAPABLE OF PROVIDING A MUCH GREATER NUMBER OF TESTS IN A GIVEN AREA. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1972/378/378-007.pdf
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Arni, H T
• Publication Date: 1972

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: p. 55-67
• Monograph Title: Nondestructive testing of concrete
• Serial:
  • Highway Research Record
  • Issue Number: 378
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Compressive strength; Concrete tests; Crash tests; Nondestructive tests; Soil penetration test
• Subject Areas: Highways; Materials; Research;

Filing Info

• Accession Number: 00214130
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jun 5 1972 12:00AM