PETROGRAPHY OF DETERIORATED CONCRETE FROM THE OLD PORT ISABEL CAUSEWAY CAMERON COUNTY, TEXAS

THE OLD PORT ISABEL CAUSEWAY BUILT IN THE EARLY 1950'S SHOWED SIGNS OF EARLY DETERIORATION IN ABOUT 5 YEARS. LOCATED AT THE SOUTHERN TIP OF PADRE ISLAND ON THE TEXAS GULF COAST, THE 1 1/2 MILE LONG STRUCTURE EXEMPLIFIES HOW A HOSTILE MARINE ENVIRONMENT CAN ACCELERATE THE DETERIORATION OF CONCRETE HAVING LESS-THAN-DESIRED QUALITY. PETROGRAPHIC STUDIES SHOWED THAT FROM SLAB TO SLAB, AND OFTEN WITHIN A SLAB, THE WATER-CEMENT RATIO VARIED. IT WAS ALSO FOUND THAT AN ENTRAINED-AIR SYSTEM DID NOT EXIST AND THE SILICEOUS-GRAVEL AGGREGATE SHOWED EXTENSIVE ALKALI REACTIVITY. REACTION DEPOSITS MAINLY CONSISTED OF ALKALI-SILICA GELS ASSOCIATED WITH SILICEOUS AGGREGATES. BOTH MICROSCOPIC AND CHEMICAL ANALYSES SHOWED THE PASTE FRACTION TO CONTAIN APPRECIABLE QUANTITIES OF CHLORIDES. FIELD STUDIES REVEALED THAT CRACKING AND SPALLING WERE RESTRICTED TO THE UNDERSIDE OF THE DECK AND PILING CAPS AND TO THAT PORTION OF THE STRUCTURE WITHIN THE SPLASH ZONE BELOW ABOUT 15 FEET ELEVATION. DETERIORATION OF THE CONCRETE GRARD-RAIL SECTIONS WAS LIMITED TO THE AREAS SUBJECTED TO CONSTANT SPLASH ACTION. FOR THE MOST PART THE EXTENSIVE DETERIORATION WAS CHARACTERIZED BY CRACKING AND SPALLING ASSOCIATED WITH RUSTING REINFORCEMENT STEEL EVEN WHEN THE DEPTH OF THE STEEL EXCEEDED THREE INCHES.

  • Supplemental Notes:
    • Rept No 5-20-72-052 1 APP
  • Corporate Authors:

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  United States  78701
  • Authors:
    • Patty, T S
  • Publication Date: 1973-8

Media Info

  • Features: Figures; Tables;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214310
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Jul 16 1974 12:00AM