ECE 416_Lecture 8_HMA Properties - LECTURE 8 CHARACTERIZATION OF ASPHALT MATERIALS CHANG-SEON SHON PH.D ASSISTANT PROFESSOR DEPARTMENT OF CIVIL

ECE 416_Lecture 8_HMA Properties - LECTURE 8...

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1 Lecture 08 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 8 C HARACTERIZATION OF A SPHALT M ATERIALS Lecture 08 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 08 ECE 416: Transportation Engineering 3 H OT M IX A SPHALT (HMA) L AYERS IN F LEXIBLE P AVEMENT Unbound Sub-Base Compacted Subgrade Natural Subgrade Unbound Base Course Flexible Pavement Hot Mix Asphalt (HMA) Layer T YPES OF A SPHALT M ATERIALS HMA – Dense Graded HMA – Open Graded Asphalt HMA – Sand Asphalt Mixtures SMA (Stone Matrix Asphalt) Cold Mix Asphalt Lecture 08 ECE 416: Transportation Engineering 4 H OT M IX A SPHALT (HMA) I NGREDIENTS – Aggregate Asphalt binder Air void P ROPERTIES – Viscosity Dynamic Modulus – Temperature Dependency – Durability K EY C ONSIDERATIONS IN M IX D ESIGN Aggregate gradation, size, & porosity Optimum binder content (% air void, compaction)
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3 Characterization of Asphalt Binder 5 Lecture 08 ECE 416: Transportation Engineering 6 A SPHALT B INDER (B ITUMEN ) T O UNDERSTAND THE BEHAVIOR OF HMA, FIRST WE NEED TO UNDERSTAND THE BEHAVIOR OF THE ASPHALT BINDER I N MEPDG, BINDER PROPERTIES AFFECT THE PROPERTIES OF THE HMA MIX A SPHALT BINDER IS A RESIDUE FROM THE DISTILLATION OF HEAVY CRUDE OIL
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4 Lecture 08 ECE 416: Transportation Engineering 7 V ISCOSITY V ISCOSITY IS : Resistance of a fluid to shear (or tensile) deformation Fluid’s internal resistance to flow Time dependent deformation Highly viscous fluids – require more force to deform  n A Linear viscosity: Newtonian fluid Nonlinear viscosity: Non-Newtonian fluid Slope = (Viscosity) Lecture 08 ECE 416: Transportation Engineering 8 V ISCOSITY (C ONT D ) T YPES OF V ISCOSITY yield  Bingham fluid: Mayonnaise  1 n A n 1 n A n Shear thinning fluid: Asphalt Newtonian fluid: Water Shear thickenning fluid: Silly putty
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5 Lecture 08 ECE 416: Transportation Engineering 9 V ISCOELASTICITY V ISCOELASTICITY : V ISCOSITY + E LASTICITY T IME DEPENDENT BEHAVIORS SUBJECTED TO CONSTANT FORCE Lecture 08 ECE 416: Transportation Engineering 10 C REEP C OEFFICIENT AND R ELAXATION M ODULUS Creep Test Stress Relaxation Test 0 ( ) ( ) t D t • Elastic Modulus • Relaxation Modulus • Creep Modulus Creep Compliance What is the differences between solids and fluids?
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