An evaluation of the NCSA hydrochloric acid leaching procedure.
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An evaluation of the NCSA hydrochloric acid leaching procedure.

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  • Creators:
    Garana, Edward
  • Corporate Creators:
    Texas. Highway Department
  • Subject/TRT Terms:
  • Publication/ Report Number:
    Research Report SS 11.7
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • 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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