EFFECTS OF VARIOUS SEALING SYSTEMS ON PORTLAND CEMENT CONCRETE JOINTS

THE PURPOSE WAS TO INVESTIGATE WHETHER THE USE OF NEOPRENE COMPRESSION SEALS INCREASED THE LIFE OF JOINTS WITH A CORRESPONDING INCREASE IN THE LIFE OF THE STRUCTURE. IN ORDER TO EVALUATE THE JOINT CONDITIONS AFTER YEARS OF EXPOSURE, FIVE PROJECTS WERE LOCATED WHICH HAD ADJACENT PROJECTS THAT WERE STRUCTURALLY THE SAME BUT USED DIFFERENT JOINT SEALANTS. JOINTS SEALED WITH NEOPRENE WERE COMPARED WITH THOSE SEALED WITH HOT-POURED ASPHALT, COAL-TAR EPOXY, POLYSULFIDE AND LIQUID SEALANTS. THE RESULTS SHOW THAT NEOPRENE SEALS, BY KEEPING INCOMPRESSIBLE MATERIALS AND LIQUIDS THAT CARRY FINE DEBRIS AND SILT FROM THE PLANE-OF- WEAKNESS CRACKS, CAN PREVENT FUNCTIONAL DAMAGE TO JOINTS AND THEREBY EXTEND THE LIFE OF A STRUCTURE. IN THE FIVE STATES SURVEYED IN THIS REPORT, THE JOINTS SEALED WITH NEOPRENE WERE IN BETTER OVERALL CONDITION THAN THOSE SEALED WITH OTHER SYSTEMS. MINNESOTA RESEARCH ENGINEERS STATED THAT 98 TO 99 PERCENT OF THEIR PROBLEMS WITH JOINTS HAVE BEEN ELIMINATED SINCE THEY STARTED TO USE NEOPRENE SEALS. NO BLOWUPS HAVE OCCURRED IN THE NEOPRENE-SEALED SECTIONS OF PAVEMENT UNDER STUDY; HOWEVER, BLOWUPS HAVE OCCURRED IN THE ADJACENT SECTIONS. THE JOINTS IN CALIFORNIA THAT CONTAINED NO SEALANT OF ANY TYPE ARE NOW AT LEAST TWICE THEIR ORIGINAL WIDTH. UNSEALED AND LIQUID-SEALED JOINTS SHOWED CONSIDERABLE DEGRADATION AND DAMAGE THROUGH THE INFILTRATION OF INCOMPRESSIBLE MATERIAL INTO THE JOINTS. AFTER 6 OR 7 YEARS OF SERVICE, REPAIR OR REHABILITATION OF THE JOINTS WOULD BE IMPOSSIBLE BECAUSE OF THE INFILTRATION OF INCOMPRESSIBLE MATERIAL INTO THE PLANE-OF-WEAKNESS CRACKS. FURTHER DAMAGE MIGHT BE STOPPED BY ADEQUATE SEALING. A SURVEY SHOULD BE MADE IN 2 TO 3 YEARS TO DETERMINE THE EXTENT OF THE DAMAGE TO THE SLABS. SLAB DAMAGE IS CURRENTLY MINIMAL WITH ALL SYSTEMS.

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 28-39
  • Monograph Title: Concrete pavement construction and joint sealants
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207467
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 19 1972 12:00AM