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M-1 APPENDIX M. THE LIST OF NEW INPUT PARAMETERS FOR THE TOP-DOWN CRACKING DESIGNING PROGRAM The top-down cracking designing program has new input parameters in the module of traffic, climate, and material properties, which are listed in the table below. Table M-1. List of New Parameters in the Top-Down Cracking Program Program Module Model New Parameters Input Level Data Sources Test Protocol Traffic Cumulative axle load distribution model (Eq.4.49) ï¡ , ï§ 1 Data of the sections used are provided as electronical attachment Other sections can be found in LTPP database N/A Crack initiation model (Eq. 4.53 & 4.54) AADTT 2 Data of the sections used are provided as electronical attachment Other sections can be found in LTPP database N/A Climate Pavement temperature model (Eq. 4.21) hourly solar radiation, hourly air temperature, hourly wind speed, Emissivity coefficient, Absorption coefficient, Albedo 1 Data of the sections used are provided as electronical attachment N/A Energy parameter for crack initiation time (Eq.4.53) HT & LT 1 Data of the sections used are provided as electronical attachment Other sections can be found in LTPP database N/A Material Dynamic modulus gradient (Eq. 4.1) n, k 1 Laboratory measurements of asphalt field cores Appendices A & B
M-2 Dynamic modulus master curves with time- temperature shift factors (Eq. 4.3 &4.4) gE , eE , ER , cEï· , 1C , 2C 1 Dynamic modulus master curves with time- temperature- aging shift factors (Eq. 4.5-4.8) xa , 0a , En , gxE , 0gE , ExR , 0ER , xa , 0a , Rn , A, 1 Dynamic modulus master curves with time- temperature- aging-depth shift factors (Eq. 4.9) db , da 1 Aging prediction models (Eq. 4.10-4.18) Eaf, Af, Eac, Ac 1 Laboratory measurements of dynamic modulus gradient of asphalt field cores at different aging periods Appendices A & B 3 N/A Appendix G Modified Parisâ law (Eq. 4.24) Aâ, nâ 1 Laboratory measurements by repeated load test Appendix D 2 Eq. F-2 and F-3 Appendix F 3 N/A Appendix F Relaxation modulus model (4.34) Aggregate gradation parameter (4.35) E1, m, ï± , ï¹ 1 Laboratory measurements by relaxation test Standard test
M-3 Relaxation modulus model (4.51) E1, m 2 Determined by the dynamic modulus master curve from LTPP Air void distribution (Eq. 4.45) a Obtained from LTPP mix design Performance Longitudinal crack length (Eq. 4.50) ï² , ï¢ , ot Obtained from LTPP pavement performance
