AASHTO Rigid Pavement Slab Thickness Calculator

Highway & Airport Pavement Design: Solve the AASHTO 1993 rigid pavement equation for required Portland Cement Concrete (PCC) slab thickness ($D$) and dowel bars.

Design Traffic & Reliability

Design Traffic $W_{18}$ (Million ESALs):

Reliability Level $R$ (%):

Overall Standard Dev. $S_0$:

Serviceability Loss $\Delta PSI$:

PCC & Subgrade Materials

Modulus of Rupture $S^{\prime}_c$ (psi):

Concrete Elastic Modulus $E_c$ (psi):

Subgrade Modulus $k$ (pci):

Drainage Coeff. $C_d$:

Joint & Shoulder Load Transfer $J$:

Slab Sizing & Reinforcement Summary

Required Slab Thickness ($D$)

-- in

-- mm

Recommended Design Thickness

-- in

Rounded to nearest 0.5"

Dowel Bar Diameter ($d$)

-- in

Spacing: 12 in (300 mm) c-c

Radius of Relative Stiffness ($\ell$)

-- in

-- mm

Design Specifications:

• Transverse joint spacing: $L_{\text{joint}} \le 24 D \approx$ -- ft

• Dowel bar length: 18 inches (450 mm), Grade 60 smooth epoxy-coated steel

• Concrete compressive strength ($f'_c \approx S'_c / 0.15$): ~-- psi (~-- MPa)

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AASHTO Rigid Pavement Slab Thickness Calculator

Design Traffic & Reliability

PCC & Subgrade Materials

Slab Sizing & Reinforcement Summary

Frequently Asked Questions