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Pavement Design I Week 1 Notes

by: Francis

Pavement Design I Week 1 Notes CEE 406

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About this Document

Notes from introduction block, covering essential terms and concepts.
Pavement Design I
Dr. Jaime Hernandez
Class Notes
Pavement, Design, HMA, PCC, ESAL




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This 3 page Class Notes was uploaded by Francis on Saturday August 27, 2016. The Class Notes belongs to CEE 406 at University of Illinois at Urbana-Champaign taught by Dr. Jaime Hernandez in Fall 2016. Since its upload, it has received 10 views. For similar materials see Pavement Design I in Civil and Environmental Engineering at University of Illinois at Urbana-Champaign.

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Date Created: 08/27/16
Class Notes CEE 406 - UIUC Pavement Design I – Dr. Jaime Hernández Week 1 (22 – 26 August) REMINDERS:  Review syllabus for course outline and grading criteria  Graduate students must prepare a term paper to obtain 1 extra credit hour TOPICS: Pavement History and Overview  The function of a pavement is to provide a smooth, durable, environment friendly, and safe vehicle access between 2 points under all climate conditions.  Considerations for pavement design: o Serviceability o Load capacity o Economics o Pollution/sustainability o Right of way o Aesthetics  Input data for pavement design: o Topography, weather, soil classification, traffic, materials characteristics, life span.  Pavement design methodologies: o Empirical: based on experience and field data o Mechanistic-Empirical: field/experience data plus mathematical predictions o Mechanistic: simulation and predictions based  Types of Pavements o Flexible: made with asphalt materials o Rigid: made with PCC o Composites, mix of PCC and asphalt layers 1 Class Notes CEE 406 - UIUC  Major Road Tests, test and monitor performance of pavements under real-life conditions o Maryland o WASHO o AASHO  Maryland major findings: o Cracks increase with loading o Pumping of plastic clay soils o Increase speed reduce damage (frequency of loading) o Curling at corners (different temperatures at top and bottom layers create curling effect)  WASHO major findings: o Damage increase with loading, tested for different axis configuration (Sxx, Txx, where S = single axis, T = tandem axis, xx = load (18,32,22,40 kips). o More distress in outer line (no paved shoulder).  AASHO major findings: o More cracking in sections with rutting o Greater deflection in spring (swelling effect of soil). o Higher speeds reduce deflection o More cracking during cold periods; higher stiffness -> higher stress concentrations  AASHO development of Present Serviceability Index (PSI) o Categorize pavement sections from 5 (very good) to 1 (very poor) condition, using field survey data as input (slope variance, rut depth, cracking, patching).  Main shortcoming of AASHO is that they performed small number of cycle repletion (< 2million) current life designs goes to higher than 100 million, hence the need to applied a more mechanistic approach. 2 Class Notes CEE 406 - UIUC  Design parameters: o Considering:  Traffic and loading  Environment  Materials o Metrics  Failure criteria  Safety  Economics  Tire/Axle Loading o Axle readings are transform to a “standard” measure ESAL (Equivalent Single Axle Load), which is a single axle dual tire 18-kip load configuration. o Contact area between tire and pavement can be overly simplified (considered as a circle) or overly detailed (every tire tread has its own contact area). o Tire pressure and load have different effect on pavement stress, higher pressures increase stress at the top of the layer; while, higher loads increase stress at the bottom of the layer. READING RECOMMENDATIONS:  Chapter 1 “Pavement Analysis and Design” by Yang H. Huang 3


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