Structural Pavement Section Design:

Pavement surfaces (asphalt, concrete, etc.), and the performance of a pavement surface over time, are primarily controlled by the subgrade materials which underlie the pavement and the presence (or lack thereof) of water in the subgrade (from surface runoff, groundwater, etc.). In most cases, an engineered structural fill section (i.e., pavement section) is constructed above the existing soils in an effort to support the overlying traffic loads and reduce the potential for differential settlements which can damage the pavement surface; resulting in rutting, cracking, potholing, etc.

Properly constructed pavement sections are especially important in cold-weather climates; where (given the right conditions) freezing air temperatures can result in the formation of ice lenses in the pavement subgrade.  Ice lenses can result in the formation of frost heaves and, upon thawing, significantly reduce the bearing capacity of the subgrade by introducing large amounts of water into the subgrade.   As a result, the State of Alaska and the Municipality of Anchorage both require that engineered pavement sections be designed for their road projects, runways, etc. to help reduce the potential for frost-related damage and prolong the service life of the pavement surface.

There are several factors to consider when developing design recommendations for a pavement section, whether it be for a private driveway or parking lot, municipal or state-operated road or highway, aircraft runway, or unpaved rural roadway.  We have extensive experience designing practical pavements sections which are well-suited for their location and intended use. Furthermore, we understand that conventional road construction in rural/remote Alaskan settings can be cost prohibitive, and we have developed practical design options to help reduce construction and maintenance costs by increasing constructability and extending the service life of the pavement section.