DESIGN, CONSTRUCTION AND PERFORMANCE OF CONTINUOUSLY REINFORCED PAVEMENT

EXPANSION AND CONTRACTION JOINTS ARE ELIMINATED BY THE USE OF ADDITIONAL REINFORCING STEEL IN CONTINUOUSLY REINFORCED CONCRETE (CRC) PAVEMENT. WHILE THE USE OF CONTINUOUSLY REINFORCED PAVEMENT IS RELATIVELY NEW IN OHIO, THERE ARE CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS IN THE COUNTRY WHICH ARE TWENTY TO THIRTY YEARS OLD, AND 6.100 EQUIVALENT TWO-LANE MILES HAVE BEEN BUILT OR PLACED UNDER CONTRACT. CONTROL OF CRACK WIDTH IS THE SECRET OF GOOD PERFORMANCE OF CRC PAVEMENT. CRACKS IN A PROPERLY DESIGNED AND CONSTRUCTED CRC PAVEMENT ARE HELD TIGHTLY CLOSED BY THE STEEL AND REMAIN SO PROVIDED THE STEEL PERCENTAGE IS ADEQUATE FOR THE PREVAILING CLIMATIC CONDITIONS. IT HAS BEEN SHOWN EMPIRICALLY BY THE PERFORMANCE OF EXPERIMENTAL CRC PAVEMENTS THAT FOR EQUAL LOAD CARRYING CAPACITY A CRC PAVEMENT NEED NOT BE AS THICK AS A JOINTED PAVEMENT. USING THE PREMISE THAT THE CRITICAL STRESS OCCURS WHERE A WHEEL LOAD IS AT A TRANSVERSE EDGE, THE RELATIONSHIP BETWEEN THE THICKNESS OF CRC PAVEMENT AND JOINTED PAVEMENT CAN BE SHOWN BY A SIMPLE ANALYSIS. FOR EQUAL LOAD CARRYING CAPACITY, THE THICKNESS OF A CRC PAVEMENT NEED BE ONLY ABOUT 75% THAT OF A JOINTED PAVEMENT. EXTENSIVE LOAD DEFLECTION TESTS BY THE TEXAS HIGHWAY DEPARTMENT HAVE SHOWN THAT CRACKS IN THE CRC PAVEMENT ARE VIRTUALLY 100% EFFECTIVE IN TRANSFERRING LOAD. A MOVIE WAS SHOWN DEMONSTRATING METHODS BEING USED BY CONTRACTORS TO PLACE REINFORCING STEEL AND CONCRETE IN CRC PAVEMENTS. PERFORMANCE OF CRC PAVEMENT OVER THE YEARS HAS BEEN EXCELLENT. FAILURES CAN BE AVOIDED IN CRC PAVEMENT BY: (1) RECOGNIZING THAT CONSOLIDATION OF THE CONCRETE IS ESSENTIAL IN THE CONSTRUCTION OF ANY TYPE OF CONCRETE PAVEMENT, (2) EXTREME CARE MUST BE TAKEN TO AVOID HONEY-COMB CONCRETE AND POOR BOND WITH THE STEEL, (3) ADEQUATE LAPPING OF THE STEEL MUST BE PROVIDED, AND (4) WEAK SUBGRADES AND SUBBASES CAN CAUSE FAILURES AS THEY DO IN JOINTED PAVEMENT. SOME FAILURES HAVE OCCURRED BUT THE CAUSES CAN BE AVOIDED AND BETTER PAVEMENTS BUILT.

Subject/Index Terms

Filing Info

  • Accession Number: 00205793
  • Record Type: Publication
  • Report/Paper Numbers: pp 125-137
  • Files: TRIS
  • Created Date: Jul 27 1970 12:00AM