INVESTIGATION OF THE PERFORMANCE OF CONCRETE IN SERVICE

THE STUDY OF POOR PERFORMANCE OF CONCRETE CAN BE MADE TO: (1) DETERMINE THE CAUSE FOR THE POOR PERFORMANCE OF CONCRETE, AND (2) DETERMINE THE LOCATION, AMOUNT, AND DEGREE OF DETERIORATED CONCRETE IN A STRUCTURE IN WHICH THE CONCRETE EXHIBITS POOR PERFORMANCE. RECORDS THAT SHOULD BE ASSEMBLED FOR THESE STUDIES ARE EMPHASIZED. THE CAUSE OF POOR CONCRETE PERFORMANCE IS LIKELY TO BE A RESULT OF THE FOLLOWING: (1) THE STANDARDS ESTABLISHED BY THE PLANS AND SPECIFICATION ARE NOT SUFFICIENTLY HIGH FOR THE CONDTIONS OF SERVICE, (2) A CHANGE IN THE CONDITIONS OF SERVICE RESULTED IN THE ESTABLISHED STANDARDS BEING INADQUATE, AND (3) THE CONCRETE DID NOT MEET STANDARDS ESTABLISHED BY THE PLANS AND SPECIFICATIONS. SUMMARY DATA SHEETS FOR CONCRETE PAVING PROJECTS USED IN MISSOURI ARE DESCRIBED. THESE DATA SHEETS ARE VALUABLE IN MAKING PAVEMENT SURVEYS BECAUSE ALL PERTINENT INFORMATION IS RECORDED CONCERNING THE CONCRETE, PAVEMENT DESIGN, JOINTS, REINFORCEMENT, BASE, AND SUBGRADE. IT IS EMPHASIZED THAT THE ASSEMBLY OF RECORDS FOR INVESTIGATION OF CONCRETE PERFORMANCE MUST BE AN ORDERLY PROCESS. IN MISSOURI, THE EXPERIENCED RESEARCHER WOULD INTIALLY DO LITTLE MORE THAN CHECK THE INFORMATION RECORDED ON THE PROPORTIONING PLANT INSPECTOR'S DAILY RE- PORT. THIS WOULD PROVIDE INFORMATION LIKE MATERIAL SOURCE, CONCRETE PROPORTIONS, SLUMP, AIR CONTENT, SIZE OF BATCH, AIR TEMPERATURE AT TIME OF CONSTRUCTION, WHETHER THE CONCRETE WAS JOB-OR-TRUCK MIXED, AND THE LOCATION OF THE PROPORTIONING PLANT. WITH THIS INFORMATION AND THE KNOWLEDGE OF MATERIALS, WEATHER, TRAFFIC, CONSTRUCTION AND MAINTENANCE PRACTICES, AND TYPES OF CONCRETE DETERIORATION FOUND IN MISSOURI, THE RESEARCHER IS WELL EQUIPPED TO ANALYZE THE TYPE AND SCOPE OF THE PROBLEM, AND TO DETERMINE WHAT ADDITIONAL INFORMATION HE NEEDS TO ASSEMBLE FROM CONSTRUCTION RECORDS, SURVEYS, LABORATORY TESTS ON CONCRETE SAMPLES, OR OTHER SOURCES.

Media Info

  • Media Type: Print
  • Pagination: pp 5-8
  • Monograph Title: Observations of the performance of concrete in service
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213689
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 21 1970 12:00AM