PREDICTING THE MICROSTRUCTURAL DEGRADATION OF CONCRETE IN MARINE ENVIRONMENT

The condition of a series of concrete samples taken from a floating boat dock exposed to the Pacific Ocean since 1978 was assessed. The aim was to predict long-term behavior of lightweight concrete in marine environments as part of the U.S. Navy Modular Hybrid Pier program. Microstructural alterations were investigated by petrographic examinations using optical and scanning electron microscopy. Chloride profiles were measured by chemical analyses. Bulk properties of each series of concrete samples were also determined by porosity measurements, pore solution extraction, chloride migration tests, and moisture transmission measurements. The actual state of deterioration of each series of samples was compared to results yielded by a numerical model. The model accounts for the coupled transport of moisture and 8 different ionic species within unsaturated concrete structures. The software also considers the chemical equilibrium of 10 different solid phases. Parameters affecting the long-term performance of concrete in seawater are discussed.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 1127-53

Subject/Index Terms

Filing Info

  • Accession Number: 00964587
  • Record Type: Publication
  • ISBN: 0870311131
  • Report/Paper Numbers: SP-212-69
  • Files: TRIS
  • Created Date: Oct 23 2003 12:00AM