DETERIORATION OF CONCRETE IN EISENHOWER LOCK

CONCRETE IN THE EISENHOWER LOCK ON THE ST. LAWRENCE SEAWAY HAS DETERIORATED BADLY AROUND THE FILLING-AND-EMPTYING PORTS, BUT CONCRETE IN THE SNELL LOCK JUST DOWN STREAM HAS NOT. BOTH LOCKS WERE BUILT UNDER THE SAME SPECIFICATION AND BY SIMILAR METHODS FROM THE SAME AGGREGATE. THE THEORY NOW UNDER STUDY AS TO THE CAUSE IS THAT CAPILLARY SPACE AND AIR VOIDS BECAME SATURATED DURING LOCK OPERATIONS AND THE CONCRETE WAS DAMAGED AS FREEZING OCCURRED WHEN THE LOCK WAS DEWATERED DURING WINTER SHUTDOWN. THE CONTRACTOR OF THE EISENHOWER LOCK TOOK AN OPTION OF REPLACING 25% OF THE PORTLAND CEMENT WITH EQUIVALENT NATURAL CEMENT. ONLY PORTLAND CEMENT WAS USED AT SNELL. STRENGTH OF CONCRETE AT EISENHOWER LOCK DID NOT DEVELOP AS RAPIDLY OR GO AS HIGH AS AT SNELL. REPAIRS ARE BEING MADE. CRACKS HAVE DEVELOPED AT THE UPPER OUTSIDE CORNER OF THE BIG CULVERTS THROUGH THE WALLS OF BOTH LOCKS. THEY ARE ASCRIBED TENTATIVELY TO GREATER PRESSURE FROM BACKFILL THAN WAS ANTICIPATED, WHICH UNREINFORCED CONCRETE COULD NOT RESIST IN TENSION. THIS PROBLEM IS BEING CORRECTED WITH POST TENSIONING TENDONS PARALLEL TO THE SLOPING BACK WALL, ANCHORED INTO GOOD CONCRETE.

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  • Supplemental Notes:
    • Vol 38, No 5, PP 62-66, 4 FIG, 1 TAB, 2 PHOT
  • Authors:
    • Waugh, W R
  • Publication Date: 1968-5

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  • Accession Number: 00212645
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 22 1994 12:00AM