Section III: Surface Gravel

The answer to this question will vary depending on the region,localsources of aggregate available andother regions of thecountry do not have good sources ofgravel (technically called aggregate).A few coastal regions use seashells for Surface material on their ,this Section of themanual will discuss the most commonsources of are quarryaggregates such as limestone,quartziteand granite;glacial deposits of stone,sand,silt and clay;and river run gravelsthat generally are a mix of stone thing should be stressed:it pays to use the best quality materialavailable.(31)Difference in Surface Graveland Other UsesToo often Surface Gravel is taken fromstockpiles that have actually beenproduced for other uses. For instance,the Gravel could have been producedfor use as base or cushion material for a paved are two majordifferences between Surface Gravel andbase (cushion) Gravel forSection III: Surface GravelSection III: Surface Gravel39base courses will generally have largertop-sized stone and a very small per-centage of clay or fine is necessary for the strength and gooddrainability needed in base gravels.

surface, but there are pitfalls. In this material, the bituminous portion of the old pavement becomes the binder. When placed on a road in hot weather, the recycled asphalt can take on the characteristic of pavement. But it will be a weak pavement. It will often develop potholes and will be hard to maintain with simple blade maintenance.To help

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