12 The economics of overlay design and road rehabilitation

Mitchell, R L

doi:10.1680/hiidc.01633.0016

Cited by 2 publications

(3 citation statements)

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“…Infiltration of moisture lowers the stress sensitivity of the crushed rock layer (in terms of K 2 , hence overall stiffness). To circumvent the problem of an inconsistent base for the overlay, in 1983 Mitchell reported that the highway department in Zimbabwe rips and spreads the existing base and shoulder and then stabilizes with 2 percent cement or lime (if required) and recompacts (7). In this manner, the granular overlay is assured of having a solid base.…”

Section: Existing Pavement (Before Overlay)mentioning

confidence: 99%

“…An advantage of the granular overlay is protection of the existing pavement from daily temperature extremes. This is important during hot summer months and in tropical countries where pavement surface temperatures can approach and exceed 70°C (160°F) (7).…”

Section: Insulationmentioning

confidence: 99%

“…The highway department in Zimbabwe has found that the practical range for construction of the crushed rock layer in an overlay is 120 to 150 mm (5 to 6 in.) (7). Thinner layers tend to shear under a roller.…”

Section: Design Of Granular Overlaysmentioning

confidence: 99%

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Granular Overlays on Low-Volume Roads in Washington State: Structural and Performance Characteristics

Uhlmeyer

Mahoney

Lovejoy

et al. 2001

Transportation Research Record: Journal of the Transportation R

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The granular overlay system is an alternative type of overlay for rehabilitating mostly low-volume, rural pavements. The overlay consists of a layer of densely compacted, crushed stone overlaid by a generally thin surface layer (either a bituminous surface treatment or asphalt concrete). The Washington State Department of Transportation continues to be interested in these roadways because performance has been better than expected with rehabilitation survival lives doubling from 7 to 14 years with the addition of granular overlays. Previous attempts to backcalculate layer moduli and understand the structural characteristics of granular overlays were limited because of uncertainties associated with layer thicknesses. With known layer thicknesses obtained from four sites, backcalculation of granular overlay pavements was possible. These moduli along with straightforward performance information are used to characterize granular overlays.

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Section: Existing Pavement (Before Overlay)mentioning

confidence: 99%

Section: Insulationmentioning

confidence: 99%