ECE 416_Lecture 5_Subgrade Prop - LECTURE 5 CHARACTERIZATION OF SUBGRADE AND UNBOUND MATERIALS CHANG-SEON SHON PH.D ASSISTANT PROFESSOR DEPARTMENT OF

ECE 416_Lecture 5_Subgrade Prop - LECTURE 5...

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1 Lecture 05 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 5 C HARACTERIZATION OF S UBGRADE AND U NBOUND M ATERIALS Lecture 05 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
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2 Lecture 05 ECE 416: Transportation Engineering 3 HTTP :// WWW . PAVEMENTINTERACTIVE . ORG / an information resource for the pavement community and self-directed learning tool HTTP :// ONLINEPUBS . TRB . ORG / ONLINEPUBS / ARCHIVE / MEPDG / GUIDE . HTM PDF documents of the MEPDG (NCHRP 1-37A) – Read-only HTTP :// ONLINEMANUALS . TXDOT . GOV / TXDOTMANUALS / PDM / I NDEX . HTM TxDOT Pavement Design Guide U SEFUL O NLINE R ESOURCES Lecture 05 ECE 416: Transportation Engineering 4 T YPICAL P AVEMENT S TRUCTURE Rigid Pavement Flexible Pavement
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3 Lecture 05 ECE 416: Transportation Engineering 5 S UBGRADE & U NBOUND M ATERIALS IN P AVEMENT L AYERS Portland Cement Concrete (PCC) Slab Compacted Subgrade Natural Subgrade Hot Mix Asphalt (HMA) Layer Unbound Base Course Unbound Subbase Compacted Subgrade Natural Subgrade Unbound Base/Sub-Base Course Rigid Pavement Flexible Pavement Characterization of Subgrade and Unbound Materials in AASHTO 1993 Guide 6
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4 Lecture 05 ECE 416: Transportation Engineering 7 1993 AASHTO D ESIGN E QUATION (F LEXIBLE P AVEMENT ) 10 18 10 10 10 5.19 log 9.36 log 1 0.20 log 4.2 1.5 2.32 log 8.07 1094 0.40 1 R o R W Z S SN PSI M SN M R : RESILIENT MODULUS ( IN psi) SN: STRUCTURAL NUMBER W 18 : C UMULATIVE ESAL S DURING DESIGN LIFE PSI: L OSS IN SERVICEABILITY (ΔPSI = P 0 P t ) Z R AND S 0 : R ELIABILITY PARAMETERS Lecture 05 ECE 416: Transportation Engineering 8  10 18 10 0.75 10 10 7 8.46 0.75 0.25 log 7.35 log 1 0.06 log 1.132 4.5 1.5 4.22 0.32 log 1.624 10 1 18.42 1 215.63 R o c d t c W Z S D PSI S C D p D J D E k 1993 AASHTO D ESIGN E QUATION (R IGID P AVEMENT )
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5 Lecture 05 ECE 416: Transportation Engineering 9 F LEXIBLE PAVEMENT : – Subgrade: Resilient Modulus (M R ) Base & subbase unbound materials: layer coefficients (a i ), which are determined based on base and subbase resilient moduli (E BS and E SB ) R IGID PAVEMENT : – Subgrade: Modulus of subgrade reaction (K-value)
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