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Project code (SA#): COLORADO DEPARTMENT OF TRANSPORTATION STRUCTURAL LAYER COEFFICIENTS OF EXISTING

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The document outlines a table and worksheet for estimating and documenting the structural layer coefficients of existing pavements for the Colorado Department of Transportation. It provides factors related to asphalt surface courses and base layers, including load-associated cracking, average age of layers, estimated air voids, and specific coefficients for different types of pavement materials. The form is intended for use in overlay projects and must be submitted to a Soils Engineer for analysis.

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What is the AASHTO method of pavement design?

In the AASHTO design method, the traffic load is determined in terms of the number of repetitions of an 18kips (18,000-lb or 80 kilonewtons (kN)) single- axle load applied to the pavement on two sets of dual tires. This is usually referred to as the equivalent single-axle load (ESAL).

What is the drainage coefficient for pavement design?

The drainage coefficient is often assumed to be 1, although quick-draining layers that almost never become saturated can have coefficients as high as 1.4 while slow-draining layers that are often saturated can have drainage coefficients as low as 0.40.

Which method is used for pavement design?

There are two basic systems of pavement design presently in use in this country. These are mechanistic systems and empirical systems. A mechanistic system employs the theories of engineering mechanics and mathematics to analyze the pavement structure.

What is the GI method of pavement design?

3.2. The group index approach is used to design flexible pavement. It is an empirical method that is based on the physical properties of the subgrade soil and does not take soil strength into account. The essential statistics required for the GI technique are the group index and traffic volume.

Which factors affect the AASHTO design equation?

From the AASHO Road Test, equations were developed which related loss in serviceability, traffic, and pavement thickness.

What is structural layer coefficient?

Under the current design guide, the structural capacity of each pavement layer is represented by a layer structural coefficient (ai) that is intimately related to the fundamental mechanical properties of the material.

What is the coefficient of asphalt?

Some typical layer coefficient values are: Hot mix asphalt 0.44. Road mix (low stability) 0.20. Aggregate base 0.13.