United States Department of Transportation
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Evaluation of Stone/RAP Interlayers under Accelerated Loading: Tech Summary
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2008-08-01
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[PDF-210.64 KB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:The first Louisiana accelerated loading experiment, Evaluation of Louisiana’s Conventional and Alternative Base Courses, showed that pavement performance could be enhanced signifi cantly if a layer of stone was placed over the cement stabilized subgrade and below the fl exible hot mix asphalt concrete (HMAC) layer. The concept is referred to as “stone interlayer design.” The increase in performance level could be attributed to strengthening the area between the soil cement and the fl exible layer and providing a medium for moisture discharge. Although the stone interlayer could not be eff ectively evaluated in an accelerated test, the stone interlayer should reduce the refl ective soil cement shrinkage cracking.
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