PAVEMENT ENGINEERING
Anno accademico 2020/2021 - 1° anno - Curriculum Ingegneria dei trasportiCrediti: 6
SSD: ICAR/04 - STRADE, FERROVIE ED AEROPORTI
Organizzazione didattica: 150 ore d'impegno totale, 92 di studio individuale, 28 di lezione frontale, 30 di esercitazione
Semestre: 2°
Obiettivi formativi
This course will provide students knowledge and skills relevant to asphalt materials and pavement design and maintenance, including material selection and characterization, mix design of asphalt concrete, design of pavement layers using both empirical and mechanistic methods, performance evaluation of existing pavements using visual inspection, manual system, high speed equipment and instrumented vehicles, and laboratory testing of materials.
Modalità di svolgimento dell'insegnamento
Lectures, tutorials, exercises, and project work.
Frequenza lezioni
Attendance is strongly suggested
Contenuti del corso
1
Traffic, environmental conditions, soil and drainage
Weather and Environment factors. Traffic and load distribution concepts. Load Equivalency Factors. Subgrade, Subbase, Drainage. Soil stabilization concept and methods.
Material characterization and asphalt mix design
Historical background. Pavement performances. Pavement Type: Flexible pavement, Rigid pavement, Special Pavement: Draining-Sound Absorbent, Composite. Asphalt Concrete. Properties and characteristics of binders and aggregates. Laboratory material characterization. Viscoelastic nature of asphalt and direct measure of stiffness. Types, properties and design of asphalt mixes. Marshall and Superpave mix Design. Harmonized European Specifications.
Structural design
Resilient modulus, Dynamic modulus of asphalt concrete. Fatigue cracking, Rutting and permanent deformation. Pavement performance and analysis period. Pavements catalogs. Empirical Methods. Mechanicistic-Empirical Methods.
Maintenance and rehabilitation
Maintenance and rehabilitation of asphalt pavement. Pavement Management Systems (PMS). Pavement Survey. Nondestructive tests. Bearing capacity, Unevenness, Skid resistance and surface texture, visual evaluation of Distress. Overlay design.
Testi di riferimento
American Association of State Highway and Transportation Officials – AASHTO (1993). Guide for Design of Pavement Structures, 4th Edition.
American Association of State Highway and Transportation Officials – AASHTO (2008). Mechanistic-Empirical Pavement Design Guide.
Huang Y. H. (2003). Pavement Analysis and Design. Prentice Hall.
Mallick R. B., El-Korchi T. (2008). Pavement Engineering. Chapman and Hall/CRC.
Verifica dell'apprendimento
Modalità di verifica dell'apprendimento
Oral examination: mid-term (40%) and final (40%)
Timely execution and discussion of the assigned homeworks and final pavement design project (20%).
Attendance and active participation will be positively evaluated.
Esempi di domande e/o esercizi frequenti
Exam questions
Materials
- Subgrade Definition and stress distribution
- Subgrade classification
- Bearing Capacity Investigation Plate test (static, Dynamic)
- Bearing Capacity Investigation Resilient Modulus
- Bearing Capacity Investigation Empirical tests (CBR, DCP)
- Compaction
- Soil Stabilization
- Drainage Typology and Design
- Aggregate Characteristics
- Aggregate Gradation
- Asphalt Concrete components and Mix Volumetric properties
- Asphalt binder typologies
- Asphalt binder empirical classification
- Asphalt binder rheology: viscosity
- Asphalt binder rheology: complex modulus
- Asphalt binder rheology: stiffness and Strength
- Asphalt Binder Performance Grade
- Asphalt Concrete Mix Design: Marshall
- Asphalt Concrete Mix Design: Superpave
- Asphalt Concrete Characteristics: Complex Modulus
- Asphalt Concrete Characteristics: Moduli Laboratory testing
- Asphalt Concrete Characteristics: Moduli empirical formulas
Design
- AASHTO empirical Design: Structural Number (PSI, Mr, R, S, ESAL)
- AASHTO empirical Design: Swelling
- AASHTO empirical Design: Layer coefficients and thickness distribution
- AASHTO Overlay design
- Empirical Mechanistic Design: Traffic Factors
- Empirical Mechanistic Design: Environmental factors
- Empirical Mechanistic Design: Multilayer Elastic System
- Empirical Mechanistic Design: Fatigue cracking
- Empirical Mechanistic Design: Rutting
Maintenance
- Pavement bearing capacity: Falling Weight Deflectometer
- Skid resistance: GRIP, SCRIM
- Pavement longitudinal profile: micro-macro-mega texture (MPD, IRI)
- Pavement surface distress