5837-15 - Recommended Procedures for Estimation of Pavement...

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Recommended Procedures for Estimation of Pavement Layer Moduli by the Dynaflect Testing System By Byron Ruth et al. 1. Use modified Dynaflect Sensor Positions.
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2. Measure air and pavement temperature. Pavement temperature should be between 30 and 85 ºF. 3. Run Dynaflect test and obtain deflections at the modified sensor locations. 4. Deflections should be within the following limits: 0.56 < D 1 or D 2 < 2.92 mil 0.27 < D 3 < 2.07 0.15 < D 4 < 1.50 0.05 < D 5 < 1.00 0.09 < D 1 + D 2 –2D 3 < 0.85 0.12 < D 3 –D 4 < 0.57 Where D 1 , D 2 , D 3 ,D 4 , D 5 = deflections at sensor locations 1, 2, Applicable ranges of layer moduli and thicknesses: 65 < E 1 < 400 ksi 26 < E 2 < 130 18 < E 3 < 90 5 < E 4 < 105 1.5 t 1 < 8.5 inches 6.0 < t 2 < 24.0 12.0 < t 3 < 36.0 Where E 1 , E 2 , E 3 t 1 , t 2 , t 3 = thicknesses of surface, base & subbase layer
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5. Estimate E 1 at in situ temperature by: (A) Direct measurement of resilient modulus of core
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5837-15 - Recommended Procedures for Estimation of Pavement...

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