Fresh blacktop - looks slippery - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 4 (permalink) Old 07-12-2015, 01:28 AM Thread Starter
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Location: Seattle, WA
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Fresh blacktop - looks slippery

So we have a bunch of road paving going on in my area. The freshly laid blacktop freaks me out a bit, it looks very smooth and slippery. Makes me slow down a bunch in the corners and just makes me nervous all around.

Am I nuts? Seems like older road surfaces have more bite to them.
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post #2 of 4 (permalink) Old 07-12-2015, 05:54 AM
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Good observation. They are slicker than the old roads where some of the surface has eroded and small stones and grit are showing. Augie

I'm always working very diligently to discover the obvious.
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post #3 of 4 (permalink) Old 07-12-2015, 09:22 AM
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Blacktop, or asphalt, pavement is made of a mixture of sand, gravel, and stones mixed with the asphalt itself. The asphalt is a petroleum oil which is just about the last stuff to come out of the refinery. It melts at a fairly high temperature. The pavement plant mixes the gravel with the hot asphalt in such a way as to coat all the material fairly evenly. It is placed, hot, on the roadway, smoothed, and rolled. It then cools and solidifies. When fresh it is very black, because all the gravel is coated with the asphalt oil. It can also be very slippery when it gets wet, because after all it is a coat of oil. It appears to fade as it ages, but that is really the asphalt coating wearing away and exposing the gravel itself. There is usually only about 5% to 10% asphalt in the mixture, and its purpose is to act as a binder or glue to hold the gravel in place. The asphalt never "sets" like concrete, but will melt again if heated. That's why your sidestand will sink into the blacktop on a really hot summer day, and why ruts form in the blacktop on roads with a lot of truck traffic.
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post #4 of 4 (permalink) Old 07-12-2015, 01:28 PM Thread Starter
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Thanks Commonground and Charon, makes sense. As a beginner rider I am riding slow and careful around corners. Straight I am comfortable at 40-45mph but faster than that I get a little nervous. Hoping I'll get better as I ride more!!
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