5837-14 - Non-Destructive Tests Purposes To determine...

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Non-Destructive Tests Purposes: • To determine pavement material properties (such as elastic modulus). • To determine a pavement’s structural capacity. • To locate inadequate subgrade support condition (e.g. voids). • To evaluate joint condition. Plate Bearing Test - Used in determination of subgrade modulus “k”. - A static load is applied to the subgrade through a circular plate 30 inches in diameter. Subgrade modulus is determined as: k = pressure / deformation where pressure = 10 psi Photo of a plate bearing test set-up Benkelman Beam • Measures the maximum pavement deflection caused by static dual wheels. • The maximum pavement deflection is determined by the rebound movement of a point between the dual tires after the tires are moved away slowly. Schematic of the Benkelman Beam Benkelman Beam
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Placing the Benkelman beam probe between the dual tires Adjusting the support beam of a Benkelman beam placed between dual tires Close-up photo of Benkelman beam dial gage used to
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5837-14 - Non-Destructive Tests Purposes To determine...

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