Thickness Design for Concrete Highway and Street Pavements Canadian Edition

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Thickness Design for Concrete Highway and Street Pavements Canadian Edition

This bulletin deals with methods of determining slab thicknesses adequate to carry traffic loads on concrete streets, roads, and highways. The design purpose is the same as for other engineered structures-to find the minimum thickness that will result in the lowest annual cost as shown by both first cost and maintenance costs. If the thickness is greater tl~an needed, the pavement will give good service with low maintenance costs, but first cost will be high. If the thickness is not adequate, premature and costly maintenance and interruptions in traffic will more than offset the lower first cost. Sound engineering requires thickness designs that properly balance first costs and maintenance costs. While this bulletin is confined to the topic of thickness design, other design aspects are equally important to ensure the performance and long life of concrete pavements. These il~clude- Provision for reasonably uniform subgrade support. (See Reference 1 for additional detail.) Prevention of mud-pumping or faulting with a relatively thin untreated or cement-treated subbase on projects where the expected truck traffic will be great enough to cause pumping. (The need for and equirements of subbase are described in References 1, 2, and 3.) Use of a joint design that will afford adequate load transfer, control cracking, and prevent joint distress due to infiltration. ("5) Use of a concrete mix design and aggregates that will provide quality concrete wit11 the strength and durability needed for long life under the actual exposure
conditions. (6) The thickness design criteria suggested are based on general pavement performance experience. If regional or local specific performance experience becomes available for more favorable or adverse conditions, the design criteria can be appropriately modified. This could be the case for particular climate, soil, or drainage conditions and
future design innovations.

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