Table 8.2 Material Properties and Results of Stress
 Analysis for SR 24 (Alachua County)

 a) Input Parameters for BISAR


 L r Dn Thickness Poisson's Modulus (psi)
 Layer Description
 (in.) Ratio Dynaflect FWD

 1 Asphalt Concrete 2.5 0.35 1,288,100 1,288,100
 2 Limerock Base 11.0 0.35 105,000 55,000
 3 Subbase 17.0 0.35 75,000 40,000
 4 Subgrade 0.35 38,600 38,600


* Computed at 230F using rheology data (Table 5.4)



 b) Pavement Stress Analysis

 Response Parameters** Dynaflect FWD

 Maximum Surface Deflection milss) 8.1 11.7

 Radial stress, bottom of AC layer (psi) 182.0 278.0
 Radial strain, bottom of AC layer (E-6 in./in.) 101.0 140.0

 Vertical stress, top of base layer (psi) -58.3 -46.0
 Radial stress, top of base layer (psi) -12.2 -10.5

 Vertical stress, top of subbase layer (psi) -12.2 -11.8
 Radial stress, top of subbase layer (psi) -0.4 -0.7

 Vertical stress, top of subgrade (psi) -3.2 -3.9
 Vertical strain, top of subgrade (E-6 in./in.) -87.7 -105.0

 Deflection in AC layer (%) 1.1 0.9
 Deflection in base layer (%) 34.1 38.4
 Deflection in subbase layer (%) 19.1 25.2
 Deflection in subgrade layer (%) 44.9 35.5


 Computed for single axle with dual wheels (6.0 kips/wheel)

 NOTE: + = tensile
 = compressive