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by Rick Forrester
Cyclists, rollerbladers, skiers, and even walkers are well aware of the problem that tree roots cause on the trail. Growing under the asphalt, the roots push the asphalt upward and create ridges and cracks that have been the downfall of trail users.
To remediate these problems, the Friends of the Little Miami State Park owns a “SPS8 Gas Powered Multi-Use Surface Preparator.” It is also called a scarifier, or simply a bump grinder. It uses an-8 inch-wide drum composed of a set of cutter wheels that rapidly rotate to plane the surface of the asphalt. The depth of cut is adjustable, with 10 different settings to provide precise control for removing everything from surface graffiti to multi-inch bumps.
Once the bump is removed, we evaluate whether or not additional work is needed to repair the asphalt. This could be simply doing nothing at all (if the underlying surface is still solid), or filling a crack with asphalt and tar. For larger problems, we may have to resort to trenching all the way across the section of asphalt to cut or remove the problem root, and then filling the trench with gravel and cold patch asphalt. We then apply liquid tar to provide a new smooth, user-friendly surface.
Please let us know if there are problem root bump areas on the trail (be sure to note the closest mile marker and send a photo if possible) and we will add it to the list!
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