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Structural Design

Structural Design

The performance of a pavement is directly related to it’s structural design.  Through experience, enhanced materials, and engineering analysis, a new asphalt pavement can be constructed to perform for 50 or more years with only surface maintenance.  By eliminating the need for deeper pavement repairs and by using superior paving materials on the surface, transportation agencies and the traveling public should expect 15  or more years between initial construction and future resurfacing.  Fortunately for asphalt pavements, the future resurfacings can be done quickly by removing the old surface and laying a new asphalt surface.  This eliminates extensive user delays, returns a road to service in a few hours, and restores the exception functional aspects of asphalt pavements.

 

Pavement Structure

Pavement Structure

AC pavements are flexible pavements.  Flexible pavements are so named because the total pavement structure deflects, or flexes, under loading.  A flexible pavement structure is typically composed of several layers of material.  Each layer receives the loads from the above layer, spreads them out, then passes on these loads to the next layer below.  Thus, […]

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Pavement Response

Pavement Response

How a pavement responds to applied stresses is the combined result of loading, environment, subgrade and pavement material characteristics.  This section presents the typical stresses and deformations experienced by an HMA pavement structure under load. Stress The stresses that occur in a HMA pavement under load are quite complex; routine calculation of these stresses is […]

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Structural Design Methods

Structural Design Methods

The goal of structural design is to determine the number, material composition and thickness of the different layers within a pavement structure required to accommodate a given loading regime.  This includes the surface course as well as any underlying base or subbase layers.  This section is focused on the structural design of new pavement. Structural design is […]

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Pavements that Never Wear Out

Pavements that Never Wear Out

The concept of building an asphalt pavement that will never wear out (often referred to as Perpetual Pavements), is not new. Full-depth and deep-strength asphalt pavement structures have been constructed since the 1960 in the U.S. and throughout Europe.  Those that were well-designed and well-constructed have been very successful in providing long service lives under […]

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