The deterioration of concrete structures for breakwaters in cold marine environments, situated in the northernmost part of Japan, was examined by means of physical inspections as well as chemical analysis. A total of 76 points is selected from 16 breakwaters for measuring deterioration. The 16 breakwaters consist of 10 fishing ports where four of them are situated in the north islands, two are situated along the Sea of Japan, and four are along the Sea of Okhotsk. At the time of examination, the ages of concrete ranged from 6 to 35 years. Physical inspection entailed measuring the vertical profile using a special frame. In addition, nondestructive tests were conducted to estimate the compressive strength of the concrete. Cylindrical cores (diameter 150 mm) were drilled from each breakwater for measuring the compressive strength, chloride contents and degree of carbonation. Chloride contents were measured at several depths, from the submerged surface to 80 cm inside of concrete. X-ray diffraction analysis as well as atomic absorption spectrometry, were conducted for microscopic analysis.


  • English

Media Info

  • Pagination: p. 171-183

Subject/Index Terms

Filing Info

  • Accession Number: 00728875
  • Record Type: Publication
  • Report/Paper Numbers: SP-163
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM