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Concrete Whitetopping Overlay Thickness Design
Once existing site conditions have been analyzed and the factors that contributed to pavement failure have been determined, the design of the parking lot overlay can begin. First, the thickness of the new concrete surface must be determined by considering the type and volume of traffic expected, the strength of the existing pavement, and the material properties of the concrete to be used.
The American Concrete Institute Guide for the Design and Construction of Concrete Parking Lots (ACI Committee 330) provides direction on thickness selection for both new construction and whitetopping. Table 1 above summarizes whitetopping thickness design for typical values of traffic, concrete strength, and subgrade support. Traffic categories are described in Table 2.
Table 1 assumes a concrete flexural strength of 600 psi (approximately a 4000-psi compressive strength) and a modulus of subgrade reaction (k) of 100 pounds per cubic inch for the base material below the existing asphalt layer. For different traffic conditions, concrete strengths, and subgrade support, consult ACI 330.
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