Officially described as the structural layer of (a) coefficient is a measure of the relative ability of a unit of thickness of a given material to function as a structural component. For design purposes, layer coefficients are typically determined empirically based on the performance of the material. Agencies often set specific layer coefficient values for commonly used materials as a standard design policy. When multiplied by the thickness of that layer, we calculate the structural number of the layer. By adding the structural numbers of all layers together, we calculate the overall structural number for the entire cross-section.

We have pre-populated this tool with average coefficients. As technologies continue to advance, many agencies are achieving coefficients above historic averages. Create a profile on RoadResource.org to enter and maintain the coefficient data, cost, unit of measure, and life extension that is relevant to you. Once entered, this data will automatically populate the features of the site using your information.

Displayed costs are the result of a US and Canada cost survey conducted by an impartial third party. Localized costs vary greatly based on materials, labor, location and other factors. Replace pre-populated data with your local costs to make these tools more relevant or contact a contractor/supplier for a quote or for more locally relevant information.

Create a profile on RoadResource.org to enter and maintain information on cost, unit of measure, and life extension that is relevant to you. Once entered, this data will automatically populate the features of the site using your information. Note: Your data will not be reviewed or used by PPRA or any of its members and affiliates, nor will it be shared with external organizations.

Calculated by multiplying the a-coefficient of each layer type by the thickness of that layer.

We have pre-populated this tool with fairly average coefficients. Create a profile on RoadResource.org to enter and maintain the coefficient data, cost, unit of measure, and life extension that is relevant to you. Once entered, this data will automatically populate the features of the site using your information.

A number used to express the structural strength of the overall pavement. It is calculated by summing the structural numbers of each layer within the cross-section. One of the many benefits of recycling technologies is their ability to add strength to the overall cross-section.

We have pre-populated this tool with fairly average coefficients. Create a profile on RoadResource.org to enter and maintain the coefficient data, cost, unit of measure, and life extension that is relevant to you. Once entered, this data will automatically populate the features of the site using your information.

• Enter the total square yards to be treated (or toggle for metric units).
• Using the left calculator, enter a conventional approach to rehabbing or reconstructing your pavement; on the right, enter a recycling-first approach.
• Use each row to represent a different layer of pavement, selecting varying treatments or layers by depth in inches.
• A national average cost and structural coefficient associated with that layer or treatment will automatically populate.
• Use auto-populated average cost and life extension data, or enter your own data in place. Create a user profile to auto-fill your data throughout the site.
• A structural number for that pavement layer will automatically calculate.
• Your total structural number, total cost, and cost savings will populate below.
• Click the question mark icons to learn more about each input.