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Granular base equivalency or granular base equivalence (GBE) is a measure of total pavement thickness. [1] [2] Since pavement is composed of multiple layers with different physical properties, its total thickness is measured by GBE. GBE translates the thickness of different road layers to a number using a set of coefficients.
The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]
Typical base course thickness ranges from 100 to 150 millimetres (4 to 6 in) and is governed by underlying layer properties. Generally made of a construction aggregate , it is spread and compacted to at least 95% relative compaction, thus providing a stable foundation for additional layers of material.
Contrary to the ACN, the ICAO does not prescribe a standardized calculation procedure for the PCN. [4] Different PCN calculation procedures may therefore be found around the world. However, the ICAO defines a standardized reporting format for the PCN that comprises the PCN numerical value and a series of 4 letters. [1]
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Layers in the construction of a mortarless pavement: A.) Subgrade B.) Subbase C.) Base course D.) Paver base E.) Pavers F.) Fine-grained sand In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located.
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