THE DURABILITY OF CEMENT AND CONCRETE IN SEA WATER

THE PROBLEM OF SEA WATER IS REVIEWED ACCORDING TO THE ATTACKING ION. SULFATE ATTACK IN ADDITION TO THE INITIAL EXPANSIVE FORMATION OF CRYSTALLINE CALCIUM ALUMINOSULFATE, A SECOND NONCRYSTALLINE GEL PHASE, WAS SHOWN BY DIFFERENTIAL THERMAL ANALYSIS TO OCCUR IN LATER STAGES OF DESTRUCTION. THE ADDITION OF SODIUM HYDROXIDE TO THE ATTACKING SULFATE SOLUTION RESULTED IN SLOWING THE SULFATE ATTACK ON SHORT-TERM TESTS (2 YEARS). THE ADDITION OF SODIUM HYDROXIDE TO THE MIX WAS NOT EFFECTIVE. THE ADDITION OF BARIUM CARBONATE TO THE CEMENT SLOWED SULFATE ATTACK BY FORMULATION OF BARIUM SULPHATE ON EXTERNAL REGION OF BARS. THE USE OF SODIUM HYDROXIDE IN THE MIX DESTROYED THE BARIUM CARBONATE PROTECTION. THE CHLORIDE ATTACK IN THE FORMATION OF CALCIUM CHLOROALUMINATE PROVED A DESTRUCTIVE FACTOR IN THAT SULFATE ATTACK WAS ACCELERATED. IN THE MAGNESIUM ATTACK THE MAGNESIUM IONS ATTACK BY PRECIPITATING MAGNESIUM HYDROXIDE AND SOFT MAGNESIUM SILICATES. MAGNESIUM IS OF MINOR IMPORTANCE BECAUSE OF ITS LOW CONCENTRATION IN SEA WATER. DEAD SEA WATER IN THE MIX ENHANCED TEST BAR STABILITY TO MAGNESIUM ATTACK. PRACTICAL CONSTRUCTION SHOULD BE BEST QUALITY PORTLAND CEMENT A.S.T.M. I OR V CONTROLLED RIGIDITY TO ELIMINATE CRACKS, JOINTS, AND INHOMEGENEITY. THE USE OF EPOXY OR POLYESTERS PROTECTIVE COATINGS WELL APPLIED OVER A CONCRETE BODY IS RECOMMENDED. /A/LCPC/RRL/

  • Corporate Authors:

    European Symp Fresh Water Sea

    ,    
  • Authors:
    • Ben-Yair, M
  • Publication Date: 1967

Subject/Index Terms

Filing Info

  • Accession Number: 00212870
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Report/Paper Numbers: 8 pp
  • Files: TRIS
  • Created Date: Nov 23 1970 12:00AM