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Asphalt roadbed
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[quote]QUOTE: <i>Originally posted by M.W. Hemphill</i> <br /><br /> <br />To emphasize Overmod's comments, the asphalt is NOT acting as a load-bearing material for a point load, which is the case in asphalt paving for highways. It's acting as a separation between the ballast and the subgrade -- see Overmod's first sentence. That's the key sentence. It's poor practice to place ballast directly on the subgrade as the very properties that make ballast provide good drainage (large voids) also makes ballast susceptible to infiltration by fines. That's the point of the crushed rock layer between the ballast and the subgrade. It really doesn't matter if the asphalt crumbles or cracks; it's a plastic material and will be self-healing. This is utterly different than asphalt paving, which is meant to be a sealer and also a load-bearing material (which is why chipsealed roads or calcium chloride treatment is just as good under light loads). <br />[/quote] <br /> <br />Stupid question - sorry to ask - What are FINES? Fines to me are something I have to pay when I park in the wrong spot.
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