Microscopic and X-Ray Diffraction Examination of Basalt to Determine Factors Affecting Durability

Details

• Creators:
  Van Atta, R. O. ; Ludowise, J. D.
• Corporate Creators:
  Portland State University
• Corporate Contributors:
  United States. Federal Highway Administration. Traffic Systems Division ; United States. Federal Highway Administration. Washington Division
• Subject/TRT Terms:
  • Aggregates
  • Basalt
  • Diffraction
  • Durability
  • Geological surveying
  • Microscopes
  • Mineralogy
  • Petrography
  • X-rays
  • X-ray diffraction
  More +
• Publication/ Report Number:
  FHWA-RD-74- 20
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States;Washington
• Edition:
  Final Report
• Corporate Publisher:
  United States. Federal Highway Administration
• Abstract:
  Similar mineralogy and textures exist in the basaltic rock studied from four quarries in the Nestucca River area of northwestern Oregon. However, durability of the aggregates manufactured from these quarries differs greatly. This study, done by petrographic and X-ray analysis shows that no new minerals form during degradation. Existing delays such as nontronite, increase in percentage as degradation progresses. In contrast degradation did not occur in rocks containing analcite, a mineral which forms under conditions unfavorable to the formation of nontronite. It was also found that durability cannot be determined solely by percentages of weathering products found in the rocks as some studies have suggested.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/39831/dot_39831_DS1.pdf
• File Type:
  [PDF - 21.88 MB]
• Collection(s):
  Federal Highway Administration ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:533cc9518ae38790e17ef6ccaeeea60a9fc335dfd85d6b1df61fa0a7e3bf600c28344081bfa2ecc48f3cb69fc49db4f06582a4658949f6d3c0c2901b0576bee7