BRIDGE DECK LEAKAGE IN MAINE-INTERIM REPORT

THE EFFECTIVENESS OF LATEX CONCRETE IN PREVENTING BRIDGE DECK DETERIORATION IS BASED ON RESULTS OF 13 YEARS SERVICE. ITS VALUE IN EXTENDED LIFE SHOULD WARRANT WIDER USE, ESPECIALLY FOR THIN OVERLAYS. ITS PRESENT COMPETITORS, EXPANDED SHALE OR METALLIC AGGREGATES AS USED IN NEW YORK AND NEW JERSEY, ARE PROBABLY MORE SUITABLE ONLY WHERE MATERIALS ARE NEARBY AND EXPERTISE IS AVAILABLE IN ALL PROCEDURES. THE MAINE SYSTEM OF WATERPROOFING MEMBRANE USING TYPE C (1968 SPEC.) OR TYPE C (1960 SUPP.) ASPHALT HAS BEEN IN SERVICE ABOUT 10 YEARS ON MANY I-95 BRIDGES. CONSIDERABLE LEAKAGE HAS BEEN FOUND ON MOST OF THE CONTINUOUS SPANS AND SEEPAGE COMES DIRECTLY THROUGH CRACKS IN THE MEMBRANE. ON SIMPLE SPANS LEAKAGE IS NOT AS SEVERE BUT SURFACE WATER CAUSES PROBLEMS AT THE EXPANSION JOINTS. FIELD PHOTOS AND CORES PLUS LAB TESTED SAMPLES FROM FIVE MEMBRANES, SIX TO EIGHT YEARS OLD ON I-95 AND I-395 IN THE BANGOR AREA, SHOW THAT THE CRACKS IN THE PAVEMENT OFTEN EXTEND THROUGH BOTH MEMBRANE AND PAVEMENT AND THE MEMBRANE BECOMES BRITTLE WITH AGE AND/OR OVERHEATING DURING PLACEMENT. OTHER SOURCES OF MEMBRANE LEAKAGE ARE THE LONGITUDINAL AND TRANSVERSE JOINTS IN SLABS AND CURBS. THE PAVEMENT AT THE GRANITE CURB CONTRACTS IN COLD WEATHER AND THE MORTAR DOES NOT BOND WELL TO BOTTOM OF GRANITE CAUSING SEEPAGE AND MOTAR DETERIORATION. ALSO, LEAKAGE AT CURB CONTRACTION JOINTS ALLOWS CALCIUM AND CHLORIDES TO EAT AWAY PAINT FROM THE UNDERSIDE OF BEAM OR GIRDER TOP FLANGES. CORROSION FATIGUE OF TENSION FLANGES CAN DEVELOP IN REGULAR STEELS WHICH ARE BRITTLE AT LOW TEMPERATURES AND ALSO THREATEN THE CORROSION RESISTANT HIGH STRENGTH STEELS USED IN GIRDERS TODAY. THE OLDER CONCRETE BRIDGES BUILT IN THE TWENTIES AND THIRTIES ARE SHOWN TO BE MORE RESISTANT TO SALT DAMAGE DUE TO THE LONGER CURING PERIOD BEFORE EXPOSURE TO SALT. THE NEWLY DEVELOPED CALIFORNIA ELECTRICAL POTENTIAL METHOD PROVIDES EXCELLENT MEANS OF MONITORING BRIDGE DECKS FOR SALT CORROSION DAMAGE. IT WAS USED IN MAINE IN 1971 ON A RECONSTRUCTED I-95 BRIDGE CONTAINING NO MEMBRANE AND ON MANY BRIDGES WITH TEST MEMBRANES. OTHER METHODS OF WATERPROOFING HAVE BEEN TRIED IN MAINE. THESE INCLUDE COAL TAR EMULSION MEMBRANES, EPOXY OVERLAYS, EPOXY SURFACE SEALANTS, EPOXY SAND SLURRIES, ASBESTOS BASE AND WEARING COURSE, BITUMINOUS (CATIONIC) SLURRY SEALS AND RUBBERIZED MEMBRANE. BONDED CONCRETE WEARING COURSES, MONOLITHIC CONCRETE WEARING COURSES, LINSEED OIL TREATMENT AND NON-SHRINK GROUT HAVE BEEN PUT INTO REGUALR SERVICE USE. HOT RUBBERIZED ASPHALT, POLYURETHANES AND POLYSULFIDES ARE USED AS JOINT SEALANTS. OPEN JOINTS ARE BEING CLOSED WITH PREFORMED SEALS AND ELASTOMERIC AND MODULAR DEVICES WHICH ARE STILL UNDER EVALUATION. /AUTHOR/

  • Supplemental Notes:
    • TECH PAPER 72-37
  • Corporate Authors:

    Maine Department of Transportation

    Child House, 16 State House Station
    Augusta, ME  United States  04333-0016
  • Authors:
    • Smith, E V
  • Publication Date: 1972-2

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 62 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00209808
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Apr 2 1973 12:00AM