Subgrade
In transport engineering, subgrade is the native material underneath a constructed road,[1] pavement or railway track (US: railroad track). It is also called formation level.
Layers in the construction of a mortarless pavement: A.) Subgrade B.) Subbase C.) Base course D.) Paver base E.) Pavers F.) Fine-grained sand
Section through railway track and foundation showing the sub-grade
The term can also refer to imported material that has been used to build an embankment.
Construction
Subgrades are commonly compacted before the construction of a road, pavement or railway track
gollark: Unless the universe is just being simulated by accident as part of solving some complex optimization problem or something weird like that.
gollark: Basically the only universal is probably that less computation is preferred.
gollark: The laws of physics their computers run on might happen to allow some specific computations to run very fast, or make it run very slowly.
gollark: A lot of the ideas around stuff which might be an optimization in our universe do sort of assume that the universe simulating us works similarly.
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References
- http://www.highwaysmaintenance.com/drainage.htm The Idiots' Guide to Highways Maintenance highwaysmaintenence.com
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