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# 5837-7 - Development of the AASHTO Performance Equation for...

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Development of the AASHTO Performance Equation for Rigid Pavement In the AASHO Road Test, the performance of the continuously reinforced concrete pavements was found to be not significantly different from that of the plain concrete pavements. The structural design of the test sections could be characterized by the thickness of the slab, D. The relationship between pavement design (in terms of D) and traffic and performance can be expressed by: Log W t = 5.85 + 7.35 Log (D + 1) - 4.62 Log (L 1 + L 2 ) + 3.28 Log L 2 + G t / \$ W = axle load applications of end of time t D = concrete slab thickness in inches L 1 = load on one single or one tandem axle set, kips L 2 = axle code (1 for single and 2 for tandem axle) G t = a function of the change in PSI from initial to final PSI. \$ = a function of design and load variables. For Rigid Pavements: G t = log [(c 0 – p t )/(c 0 – 1.5)] = log [(4.5 – p t )/(4.5 – 1.5)] Where p t = terminal PSI β = 1.0 + 3.63 (L 1 + L 2 ) 5.2 / (D + 1 ) 8.46 L 2 3.52 The above equation relates the pavement design (in terms of D) to expected performance (in terms of the allowable load applications (W t ) to cause a certain reduction in serviceability of the pavement).

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