United States Department of Transportation
i
Measuring Foundation Course Modulus Using Falling Weight Deflectometer, Light Weight Deflectometer, and Dynamic Cone Penetration
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2021-12-01
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[PDF-643.67 KB]
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Abstract:There have been attempts in the past to forensically evaluate subgrade and foundation course strength that underly concrete pavement by Falling Weight Deflectometer (FWD) testing on top of doweled concrete. The accuracy of these data is unknown. The Falling Weight Deflectometer is a trailer mounted, non-destructive testing device that drops a weight onto the pavement and has sensors that measure the amount of resulting deflection. The slope of the load and resulting deflection is referred to as the modulus. NDOT has years of experience testing strata beneath asphalt surfaces but because FWD testing of subgrades beneath rigid pavement are not well established, NDOT has not adopted testing of rigid pavements and underlying bases by FWD.
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