Road metal is crushed rock used for paving, originally referred to as “metal” due to its hard-mined nature. Contractors can specify size ranges for projects. It improves driving conditions and drainage, and can be used for sub-bases. Delivery is available for larger loads, or supplies can be picked up from a quarry.
Road metal is rock crushed for use in paving. This term references the early origins of the word “metal,” which encompasses materials that are generally mined or mined, such as rock, and was originally used to discuss all hard-mined materials. To avoid confusion, terms such as “gravel” are used to refer to this material in most regions of the world. People in some locations, such as New Zealand, continue to refer to the aggregate rock used in road construction as road metal.
This product is obtained by extracting rock and crushing it. The crushing equipment is able to control the size of the pieces, which can be run through the sorting drums. Pieces larger than a certain size can be mined later to create a series of rock piles containing pieces of roughly similar size. When contractors order road metal, they can specify the size range or ranges they need for certain projects.
Regular road metal can be used for rural, low-traffic roads. Work crews can use spreaders to spread crushed rock across the surface of a prepared roadbed. They may follow up with compression devices such as rollers to push the rock together, compacting the surface. This can improve both driving conditions and drainage, two key issues on finished roads. Gravel backfill can also be used to fill holes in a roadway, although the entire road may eventually need to be redeveloped.
In the case of roads to be paved with asphalt, the road sheet can be used to prepare the sub-base, known as the road bed. This should promote uniform drainage to reduce damage to the top surface. It also suppresses plant growth to limit problems caused by large roots and weeds trying to work through the paving materials. Several layers of road sheet may be placed to provide adequate drainage and protection before the final layer of pavement is applied.
Paths and walkways can also be prepared with wire mesh. A finer grade can be used to make the surface more aesthetically pleasing, and crews can simply rake the gravel into place and leave it, or compact it with a roller for extra durability. Delivery is typically available for loads over a certain size and it may be possible to hire contract workers to spread the gravel upon arrival. For small projects, it is usually necessary to pick up supplies from a construction company or quarry due to delivery minimums.
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