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

Project code (SA#): COLORADO DEPARTMENT OF TRANSPORTATION STRUCTURAL LAYER COEFFICIENTS OF EXISTING 2025

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The document outlines a worksheet and table for estimating and documenting the structural layer coefficients of existing pavements for the Colorado Department of Transportation. It provides factors related to load-associated cracking, average age of pavement layers, estimated air voids, and base layer types, along with instructions for completing the form and submitting it for analysis.

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Click ‘Get Form’ to open it in the editor.
Begin by entering the project location, date, and project number at the top of the form. This information is crucial for identifying your specific project.
In the 'Asphalt Surface Course' section, assess the load associated cracking and select the appropriate factor based on your observations. Fill in the 'From' and 'To' fields to indicate mile or station representation.
Next, evaluate the average age of layer combinations and estimated air voids. Choose the corresponding factors from the provided options and document them accurately.
Proceed to calculate the total structural layer coefficient. If applicable, remember to multiply by 0.70 for pre-1990’s Grading F.
For base layers, repeat a similar process: identify factors based on your assessment and fill in any necessary details regarding mile or station representation.
Finally, use the 'Remarks' section to document any additional notes or observations that may assist in component analysis before submitting your completed form.

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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.

Project code (SA#): COLORADO DEPARTMENT OF TRANSPORTATION STRUCTURAL LAYER COEFFICIENTS OF EXISTING 2025

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What is the AASHTO method of pavement design?

What is the drainage coefficient for pavement design?

Which method is used for pavement design?

What is the GI method of pavement design?

Which factors affect the AASHTO design equation?

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What is structural layer coefficient?

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Project code (SA#): COLORADO DEPARTMENT OF TRANSPORTATION STRUCTURAL LAYER COEFFICIENTS OF EXISTING 2025

Here's how it works

How to use or fill out Project code (SA#): COLORADO DEPARTMENT OF TRANSPORTATION STRUCTURAL LAYER COEFFICIENTS OF EXISTING with our platform

Complete this form in 5 minutes or less

Got questions?

What is the AASHTO method of pavement design?

What is the drainage coefficient for pavement design?

Which method is used for pavement design?

What is the GI method of pavement design?

Which factors affect the AASHTO design equation?

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People also ask

What is structural layer coefficient?

What is the coefficient of asphalt?

Related links

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