STATISTICAL STUDY OF THE COMPLIANCE WITH SPECIFICATION OF CONCRETE SUPPLIED FOR HIGHWAY STRUCTURES IN THE UNITED KINGDOM

A STUDY HAS BEEN MADE OF THE STATISTICAL IMPLICATIONS OF A UNITED KINGDOM SPECIFICATION FOR STRENGTH OF CONCRETE FOR HIGHWAY STRUCTURES AND THE QUALITY OF MATERIALS SUPPLIED TO AND ACCEPTED UNDER THE SPECIFICATION TO SEE IN WHAT WAY THE SPECIFICATION MIGHT BE IMPROVED. THE DISTRIBUTION OF RESULTS FROM STRENGTH TESTS IS NORMAL AND THE PROPORTION OF CONCRETE DEFECTIVE AT ANY SPECIFIED STRENGTH MAY BE ESTIMATED ONCE THE STATISTICAL PARAMETERS OF THE DISTRIBUTION HAVE BEEN EVALUATED. THE PROPORTION DEFECTIVE PROVIDES A USEFUL MEASURE OF EQUALITY THAT CAN BE USED TO STUDY THE EFFECT OF PARTICULAR SPECIFICATION REQUIREMENTS ON THE QUALITY OF CONCRETE SUPPLIED IF THE OPERATING CHARACTERISTIC (OC) CURVE (RELATING THE PROPORTION DEFECTIVE AND THE PROBABILITY OF ACCEPTANCE OF THAT QUALITY) IS COMPUTED OVER A RANGE OF QUALITIES. THE CONCLUSIONS REACHED FROM EXAMINATION OF THE OC CURVE ARE COMPARED WITH THE RESULTS OF A STATISTICAL EXAMINATION OF THE ACTUAL QUALITY OF CONCRETE SUPPLIED TO 186 JOBS WHERE 8,400 TEST RESULTS WERE OBTAINED. METHODS OF IMPROVING SPECIFICATIONS ARE BRIEFLY CONSIDERED IN THE LIGHT OF THE RISKS TO THE PRODUCER OF CONCRETE AND TO THE CONSUMER, THE OBJECT OF ANY SPECIFICATION BEING TO PROVIDE A FAIR APPORTIONMENT OF THE RISKS OF REJECTION OF 'GOOD' MATERIAL AND ACCEPTANCE OF 'POOR' MATERIAL BETWEEN PRODUCER AND CONSUMER. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 50-57
  • Monograph Title: Nuclear testing, construction variability, materials control and acceptance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00215224
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 29 1994 12:00AM