QUALITY ASSURANCE FOR PORTLAND CEMENT CONCRETE

QUALITY ASSURANCE HAS BEEN SUCCESSFULLY USED IN MOST INDUSTRIES, BUT THE CONSTRUCTION INDUSTRY AND STATE AGENCIES ARE ONLY NOW BEGINNING TO RECOGNIZE ITS IMPORTANCE. THE WORK REPORTED HERE RESULTS FROM THIS RECOGNITION AND IS ONE ATTEMPT TO SHOW HOW THE ELEMENTS OF QUALITY ASSURANCE CAN BE APPLIED TO CONCRETE. CHAPTER I DEALS WITH CONCRETE UNIFORMITY AND COMPLIANCE WITH SPECIFICATIONS REQUIREMENTS, UNDER THE CURRENT DEGREE OF PROCESS CONTROL AND INSPECTION. BOTH UNIFORMITY AND COMPLIANCE ARE FOUND TO BE POOR. CHAPTER II DEALS WITH TECHNIQUES THAT PRODUCERS SHOULD USE TO ACHIEVE COMPLIANCE WITH CONCRETE REQUIREMENTS AND INCLUDES THREE CASE STUDIES TO SHOW THAT PROCESS CONTROL DOES INDEED LEAD TO COMPLIANCE. IT IS ALSO STRESSED THAT PROCESS CONTROL IS THE RESPONSIBILITY OF PRODUCERS, BUT RECOGNIZING THAT INSPECTING AGENCIES (HAVING DONE MOST OF THE TESTING IN THE PAST) MAY HAVE MORE PERTINENT INFORMATION THAN PRODUCERS, GUIDELINES ARE SUGGESTED FOR PRODUCERS TO USE UNTIL THEY ACCUMULATE DATA OF THEIR OWN. THE NEXT THREE CHAPTERS DEAL WITH ACCEPTANCE SAMPLING (INSPECTION). IN CHAPTER IV, CURRENT INSPECTION SCHEMES ARE REVIEWED WITH PARTICULAR ATTENTION TO THOSE USED IN NEW YORK. IT IS CONCLUDED THESE SCHEMES AFFORD LITTLE PROTECTION TO CONCRETE BUYERS AND ALTERNATIVE STATISTICALLY SOUND SAMPLING PLANS ARE SUGGESTED FOR INSPECTION OF FRESH AND HARDENED CONCRETE. THE ADVANTAGES AND SHORTCOMINGS OF THE SUGGESTED PLANS ARE DISCUSSED IN CHAPTER V, ALONG WITH THE MONETARY VALUE OF SUCH PLANS AS APPLIED TO CONCRETE. FINALLY, RECOGNIZING THE TREND TOWARD THE IMPROPER USE OF ACCEPTANCE CONTROL CHARTS FOR INSPECTION OF CONSTRUCTION MATERIALS, THESE TOOLS ARE REVIEWED IN CHAPTER VI. IT IS CONCLUDED THAT CONCRETE ACCEPTANCE CONTROL CHARTS ARE INAPPROPRIATE AND SHOULD NOT BE USED IN CONCRETE INSPECTION. /FHWA/

Media Info

  • Pagination: 157 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214548
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-73-77,, RR 10,, Final Report
  • Contract Numbers: SSN 45-1
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Jun 19 2003 12:00AM