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subgrade

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subgrade [′səb‚grād]
(civil engineering)
The soil or rock leveled off to support the foundation of a structure.
subgrade
1. The soil prepared and compacted to support a structure or a pavement system; the base portion of any surfaced area, the elevation of which is lower than that of the finished grade.
2. The elevation of the bottom of a trench in which a sewer or pipeline is laid.
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of Akron) and Wang (civil and environmental engineering, Virginia Tech) include research articles for fellow engineers on asphalt cracking under wet and dry conditions, new methods for roughness quantification of concrete joints and cracks, fatigue testing for hot mix asphalt and formulations for subgrade soil compaction.
Pavements and materials; modeling, testing, and performance; ... by SciTech Book News
The researchers installed 10 TDR sensors in the base and subgrade layers at each of the 70 SMP test sites monitored as part of the LTPP program.
Long Term Pavement Performance computed parameter: moisture content ... by Public Roads
Even in dry weather, the subgrade may remain wet or damp indefinitely.
Asphalt driveways made easier, Part II by Units
 
 
 
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