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Thread: Grit size of paved road surfaces

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  1. #1
    Registered User WalterK75's Avatar
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    Grit size of paved road surfaces

    I've often thought that asking someone to run a belt sander over their naked body would impress upon them what road rash means. As a corollary of this, I was curious if anyone knew what the grit size of a road surface is? Excluding gravel and sand, I'm thinking in terms of paved roads; asphalt, concrete, compacted tar and gravel.
    Walter

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    H. L. Mencken

  2. #2
    BMW MOV Club Director ENFOMAN's Avatar
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    Considering that the coarsest grit that I know of is a 30 grit, you may want to compare the road surface to a large file or rasp.

  3. #3
    Small road corner junkie pffog's Avatar
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    Years ago one of my sons friends showed up on his motorcycle in shorts. He was talking to my son when I approached him with a big old rectangular kitchen cheese grater, and made a motion like I was going to rake it across his thigh, he jumped back, looking at me like I had gone nuts.

    I said I just wanted to save you the trouble of falling off the bike, and damaging it. He got the message.

  4. #4
    Benchwrenching PGlaves's Avatar
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    All of this is in paving mix handbooks. 3/4" aggregate is a mainstay in most mixes, with an assortment of finer aggregate thrown in to fill voids and enhance adhesion. Finish courses have some course sand.

    http://www.fhwa.dot.gov/pavement/t504027.cfm
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
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    Registered User arthurdent's Avatar
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    Depends

    In MN they seal oat asphalt roads with a 1/4 - 3/8 crushed basalt. Here in NE they coat them with a 1/8-1/4 crushed quartzite.

    In the end, size doesnt matter. Sliding on rock with a 250kg bike on top is going to shred your skin remarkably well regardless of rock size.

  6. #6
    Registered User AKsuited's Avatar
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    There's also friction. Locally, all our aggregates are glacial gravels that are predominantly sandstones. These provide excellent friction. They are also very similar to sandpaper. This is in contrast to polished limestone which tends to be lacking in friction, especially when wet. Pavement friction can vary quite a bit, a good reason to have ABS.

    Blacktop can vary from fine-textured mixes, "sand asphalt" to coarser top mixes and much coarser base and intermediate layers.

    Any way you look at it, you don't want to slide down the road at highway speeds without serious protection from abrasion.

    Harry
    2003 R1150RT - Silver

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