United States Department of Transportation
i
Rapid field method for determining the polish susceptibility of carbonate aggregates.
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1974-08-01
[PDF-3.78 MB]
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Abstract:A quick and simple method by which limestones and related carbonate
paving aggregates can be rated as to their relative susceptibility to
polishing has been successfully applied to a wide number of aggregate
sources used on Texas Highway projects. The technique involves taking
a small representative sample of the aggregate and subjecting it to a
dilute hydrochloric acid treatment for about 20 seconds, The etched
particles are washed, examined under a 10-15X handlens or a stereoscopic
microscope, and the resulting surface texture is then compared
to a set of photos or diagrams for rating. The rating system, developed
fro~ the examination of over a hundred carbonate sources, can assist in
judging a material's potential susceptibility and resistance to polishing.
Data from laboratory and field-trial studies when compared to
duplicate samples tested by the Accelerated Polishing Test (Test Method
Tex 438-A), shows that a Textural Rating of 1 correlates to a range of
measured polish values of 25 to 33, a rating of 2 correlates to polish
values in the range of 34 to 37 and a rating of 3 correlates to polish
values ·greater than 37.
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