Thank you Peter Loeb. Your posting was copied into a file for future
modeling reference. I remember old concrete structures where the age
stained cement matrix had eroded away, exposing the sand and gravel
aggregate. Old sidewalks seem to be tinted by the color of the sand
used in the concrete. Also, Beloit Wisconsin once had an old concrete
paved highway through town where the top surface of the concrete and
aggegate as well were worn away, probably by studded snow tires. This
was in the late 60's. It was like terrazo and the aggregate must have
been glacial till screenings, because the gravel was variety of
colors. An amazing sight.
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