QUALITY CONTROL IN HIGHWAY CONSTRUCTION

THE DEVELOPMENT OF A COMPREHENSIVE SCHEME FOR THE APPLICATION OF QUALITY CONTROL TO ROAD CONSTRUCTION IS DESCRIBED. ATTENTION IS GIVEN TO THE SETTING UP OF A SYSTEM FOR DETERMINING JUDGEMENT NORMS FOR THE MAGNITUDE AND VARIABILTY IN REGARD TO LOWER, HIGHER AND DOUBLE SPECIFICATION LIMITS FOR BOTH PROCESS AND ACCEPTANCE CONROL. THE JUDGEMENT SYSTEM CONSISTS OF THE COMPARISON OF WORK AFTER COMPETION (IN THE CASE OF ACCEPTANCE CONTROL) OR DURING PRODUCTION (IN THE CASE OF PROCESS CONTROL) WITH A SO-CALLED STANDARD PRODUCT. THE JUDGEMENT NORMS ENABLE DECISIONS TO BE MADE ON WHETHER THE WORK COMPLIES WITH THE REQUIRED STANDARDS. BY USING VALID STATISTICAL RELATIONS THE REQUIRED NUMBER OF OBSERVATIONS, AS WELL AS THE JUDGEMENT NORMS ARE DETERMINED. JUDGEMENT NORMS ARE ALSO DEVELOPED FOR THE REQUIREMENTS WHICH MUST BE MET WHEN WORK IS RESUBMITTED AFTER INITIAL REJECTION AS WELL AS FOR THE EARLY ACCEPTANCE OR REJECTION OF WORK OF EXCEPTIONALLY HIGH OR LOW QUALITY. A PROCEDURE HAS BEEN DEVELOPED FOR STUDYING THE RELATION BETWEEN THE JUDGEMENT NORMS AND THE COSTS AND VALUE OF FINISHED WORK SO THAT THE FACTORS AFFECTING THE INHERENT PROFIT CAN BE OPTIMIZED. RECOMMENDATIONS REGARDING DATA AND OTHER REQUIREMENTS FOR THE PRACTICAL APPLICATION OF THE PROPOSED SCHEME ARE MADE FOLLOWING A COMPREHENSIVE STUDY OF LOCAL AND OVERSEAS PRACTICE. RELEVANT ASPECTS ARE: THE FREQUENCY OF TESTING, THE SIZE OF THE PRODUCT OR LOT SUBMITTEED FOR JUDGEMENT AS WELL AS THE INHERENT VARIABILITY OF DIFFERENT PRODUCT CHARACTERISTICS. RECOMMENDATIONS ARE ALSO MADE REGARDING THE INITIAL INTRODUCTION OF THE SCHEME IN PRACTICE THE APPROACH IS ILLUSTRATED BY MEANS OF AN EXAMPLE. (A)

  • Supplemental Notes:
    • CSIR204 NIRR 11
  • Corporate Authors:

    Nat Inst Road Research /S Africa

    ,    
  • Authors:
    • Kuhn, S H
  • Publication Date: 1972

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 48 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00215708
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: R&d Rpt
  • Files: TRIS
  • Created Date: Jun 5 1974 12:00AM