ECE 416_Lecture 9_AASHTO93-HMA Design - LECTURE 9 AASHTO 1993 DESIGN PROCEDURE FOR FLEXIBLE PAVEMENT CHANG-SEON SHON PH.D ASSISTANT PROFESSOR DEPARTMENT

ECE 416_Lecture 9_AASHTO93-HMA Design - LECTURE 9 AASHTO...

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1 Lecture 09 ECE 416: Transportation Engineering 1 C HANG -S EON S HON , P H .D., A SSISTANT P ROFESSOR D EPARTMENT OF C IVIL E NGINEERING N AZARBAYEV U NIVERSITY 2015 F ALL L ECTURE 9 AASHTO 1993 D ESIGN P ROCEDURE FOR F LEXIBLE P AVEMENT Lecture 09 ECE 416: Transportation Engineering 2 Design Considerations Materials Design Procedures Additional Topics Performance Indicators Traffic Inputs by AASHTO 1993 Traffic Inputs by MEPDG Subgrade & Unbound Materials Rigid Pavement: PCC Materials Flexible Pavement: HMA Materials Flexible Pavement Design by AASHTO 1993 Flexible Pavement Design by MEPDG Rigid Pavement Design by AASHTO 1993 Rigid Pavement Design by MEPDG Pavement Design Reliability Life Cycle Cost Analysis/Perpetual Pavement Drainage/Tire Noise/Surface Friction Geometric Design of Highway 2 W HERE A RE W E ?
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2 Lecture 09 ECE 416: Transportation Engineering 3 O VERVIEW OF AASHTO 1993 D ESIGN O RIGINALLY , RESULTED FROM THE AASHO R OAD T EST IN 1950 S . M ODIFIED MULTIPLE TIMES IN THE 1980 S AND 1990 S . E MPIRICAL MODELS , MODIFIED WITH SOME MECHANISTIC CONCEPTS T RAFFIC : C UMULATIVE ESAL OVER THE DESIGN PERIOD S UBGRADE CONSIDERATION : Flexible: Resilient modulus Rigid: K-value HMA: LAYER COEFFICIENT , THICKNESS , STRUCTURAL NUMBER B ASE AND S UBBASE : LAYER COEFFICIENT , THICKNESS , STRUCTURAL NUMBER D RAINAGE : MODIFICATION FACTORS PCC: MODULUS OF ELASTICITY & SLAB THICKNESS Lecture 09 ECE 416: Transportation Engineering 4 P RESENT S ERVICEABILITY R ATING (PSR) & P RESENT S ERVICEABILITY I NDEX (PSI) PSR: Mean of the individual ratings made by a panel of raters Developed as part of the the AASHTO Road Test PSI: PSI Predicts PSR using mathematical equations: PSI = f(roughness, distress) An indicator of pavement performance
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3 Lecture 09 ECE 416: Transportation Engineering 5 PSI M ODEL FOR F LEXIBLE P AVEMENTS (AASHTO R OAD T EST /1993 M ETHOD ) where: PSI = present serviceability index, a statistical estimate of the mean PSR SV = slope variance (a measure of roughness) RD = average rut depth, inches C = class II & class III, longitudinal, and transverse cracking (linear ft of cracking per 1000 ft2 of pavement) P = patching (patching area in ft2 per 1000 ft2 of pavement) R 2 = 0.844.
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