Class_23_Flexible_Pavement_Design

Class_23_Flexible_Pavement_Design - The Pennsylvania State...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #23 Flexible Pavement Design Spring 2008 What is the Largest-Most Expensive Public Works Project in U.S. History ????? Pavement Functions Guidance: Direction control => contrast color, edge lines and shoulder Visual perspective of travel path Support: Safe, smooth vehicle load support Vehicle Size and Weight Typical automobile weighs 3,500 lb with tire pressures of 35 psi. Typical tractor semi-trailer weighs 80,000 lb with tire pressures > 100 psi. Single axle = 14,200 lb Tandem axle = 34,000 lb Trucks typically control pavement design. Soil Support Soil Bearing Capacity 2 3 psi for poor soils (e.g., clay) Up to 50 psi for good soils (e.g., silty) Vehicle loads are greater than soil bearing capacity. Pavements serve to: Distribute the wheel loads at magnitude that will not shear or distort soil. Drain roadway surface. Typical Pavement Types Gravel Road (Soil) Composite Pavements Rigid and flexible layers Flexible Pavement Rigid Pavement CE 321 Focus Asphalt Cement Concrete Flexible Pavement Common Depths: Wearing Course (asphaltic surface) = 2 to 4 inches Base Course = 4 to 10 inches Subbase Course = 4 to 10 inches Load Support on a Flexible Pavement Portland Cement Concrete (PCC) Pavements Rigid Pavement Source: Principles of Highway Engineering & Traffic Analysis, 2004 Asphalt and PCC Pavements Flexible Pavement Design Background & Design Procedures History of AASHO Road Test Investment of $27 million to study pavement performance Illinois in 1958 - 1960 (I-80 Alignment) Pavement Design procedure developed Empirical Design AASHO Road Test (1958 - 1960) Objective: Provide information for use in developing pavement design criteria and procedures....
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Class_23_Flexible_Pavement_Design - The Pennsylvania State...

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