An evaluation of the NCSA hydrochloric acid leaching procedure.

Details

• Creators:
  Garana, Edward
• Corporate Creators:
  Texas. Highway Department
• Subject/TRT Terms:
  • Carbonate rocks
  • Evaluation
  • Hydrochloric acid
  • Leaching
  • Limestone aggregates
  • Polishing (Aggregates)
  • Skid resistance
  • Test procedures
  • Texture
• Publication/ Report Number:
  Research Report SS 11.7
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Corporate Publisher:
  Texas. Highway Department
• Abstract:
  In the past several years the National Crushed stone Association ; has been conducting a research study into the skid resistance of carbonate ; aggregate. The aim of the study has been the establishment of a relationship ; between the skid resistance exhibited and the physical characteristics ; of a carbonate aggregate. ; The study conducted. at the National Crushed Stone Association's ; laboratory was based on a concept that attributes the skid resistance of a ; carbonate aggregate to the differential hardness of the minerals that ; comprise the structure of the carbonate aggregate. According to this concept, ; when a carbonate aggregate is subjected to a polishing action, the softer ; minerals will wear away at a faster rate than the harder minerals. This ; differential wearing away of the constituent minerals will leave the ; Hearing surface of the aggregate with a rough, uneven texture which should ; hopefully increase the skid resistance of the carbonate aggregate. ; In order that the minerals could be examined and analyzed, a ; method had to be developed which would separate the minerals from the matrix ; "that held them together in the carbonate aggregate. The method would ; have to act only on the cementing agent since it was imperative that the ; minerals not be destroyed or altered in any manner. ; Once the minerals were separated from the matrix of the carbonate ; aggregate, t.hey could then be thoroughly examined and analyzed. The analysis ; of the minerals involved a determination of the amount of carbonate present ; in the total aggregate and a grain size distribution analysis of the constituent minerals. The minerals were also given a petrographical examination ; to determine the mineral composition of the carbonate aggregate. To analyze ; the contributions of the physical characteristics of the individual grains ; to the over--all skid resistance of the aggregate, a microscopic examination ; was made of the shape and surface texture of the mineral grains.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31459/dot_31459_DS1.pdf
• File Type:
  [PDF - 15.00 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:657ececaa15cd88820a0d38683e26597f5342ae447be95d3c4b98b1490da45c1