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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    • 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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