CE 441 – Pavement Design
I-
Catalog Description:
CE 441 : Pavement Design (3-0-3)
Pavement types and loading, behavior of pavements under dynamic loads,
stresses in flexible and rigid pavements, pavement components, pavement
design factors, flexible highway and airport pavement design, rigid highway and
airport pavement design; overlay design and computer applications.
II-
Prerequisite: CE 303.
III-
Textbook:
Yoder, E.J. and Witczack, M.W., Principles of Pavement Design,
2nd edition, John Wiley & Sons, Inc., 1975.
Reference: Ministry of Communications, Highway Construction Standards,
1987, Federal Aviation Administration Airport Design Manual.
IV- Course Objectives:
1.
2.
3.
4.
V-
Introduce students to the basic types and behavior of highway materials.
Expose students to the general aspects of pavement structural design,
flexible or rigid.
Expose students to the analysis concepts and procedures for stresses,
strains and deflection in pavements.
Introduce students to commercially available software in the area of
pavement structural design.
Topics Covered:
1.
2.
3.
4.
5.
Introduction: types of pavements, general features of pavement crosssections and facilities, composition of flexible and rigid highway, and
airport pavements (2 classes).
Design Factors: Decision criteria, design process and strategy, wheel-load
configurations and tire imprints for flexible and rigid pavements (3
classes)
Stresses in Flexible Pavements: One- and two-layer theory. Analytical
solutions. Deflections: Surface and interface, Charts of stress, and
deflection calculations. Three-layer theory, multi-layer elastic analysis.
Stress and strain charts. Numerical solutions and computer programs
available (ELSYM5) (5 classes)
Stresses in Rigid Pavements: Theory of beam on elastic foundation,
subgrade reaction modulus, equations for stresses at corner, interior and
edge of rigid slab subjected to wheel loads. Influence charts for moment
and deflection calculations. Stress charts. Effect of subgrade modulus and
slab thickness on stress and deflection under wheel load (5 classes)
Non-load-associated stresses: thermal stresses in flexible and rigid
pavements, and stresses due to friction of subgrade with rigid slab (4
classes)
6.
Traffic Loads Analysis: single, twin and tandom wheel loads; Equivalent
Axle Load (EAL) concept; AASHO factors for flexible and rigid
pavements, and calculation of EAL for a pavement life, etc. (4 classes)
7. Design of Flexible Highway Pavements: Selection of layer moduli, design
methods: AASHO, AI, CBR, Multi-layer system and the crushed stone
association method (5 classes)
8. Design of Flexible Airport Pavements: Aircraft-load-equivalency systems,
design methods, and comparison of design with that of highway pavement
(4 classes)
9. Design of Rigid Highway Pavement: Design considerations, PCC
pavements, CRC pavements, design of steel reinforcement for
temperature, and expansion joints. Design methods: PCA, and Corps of
Engineers’ methods (5 classes)
10. Design of Rigid Airport Pavements: Design consideration, aprons,
taxiways, and runways. Design methods: PCA, FAA, and Corps of
Engineers’ methods (4 classes)
11. Pavement Distress (Flexible Pavements): Types, causes, and diagnosis.
Methods of repair (Rigid Pavements): Types, causes, and diagnosis (2
classes)
12. Introduction to Pavement Management Systems: Maintenance
Management Systems and Overlay design procedures (2 classes)
VI- Contribution to Professional Component:
Engineering Science:
Engineering Design:
34% (1.0 credit hours)
66% (2.0 credit hours)
VII- Computer Usage:
Software such as ELSYMS, AASHTO DNPS86, WESTY and FAA are used to
demonstrate different methods of calculating stresses in multilayered systems
and design of flexible and rigid highway and airport pavements.
VIII- Laboratory Projects: None
IX- Relationship of Course to Program Educational Objectives:
Design objectives of this course fulfill program objective #3, in addition to the
broad categories of objectives #1 and #2. The course introduces the
fundamentals of basic science and engineering (geotechnical and
transportation). It develops basic analysis and problem solving skills using
computers.
X-
Assessment of Student Progress Towards Course Objectives:
The progress of students in this course will be evaluated through exams,
homework, quizzes and class discussion.
XI- Relationship of Course to Civil Engineering Program Outcomes and
Assessment:
This course helps the students develop an ability to apply knowledge of
engineering (Outcome #1), in addition to learning to design systems (Outcome
#3), formulating and solving engineering problems (Outcome #5), an ability to
communicate effectively through class discussions (Outcome #7), and the
ability to use techniques, skills, and modern engineering tools necessary for
engineering practice (Outcome #11).
Current Status of Information Technology
Computer programs such as ELSYMS, AASHTO DNPS86, and FAA are used
to demonstrate different methods of calculating stresses in multilayered systems and
design of flexible and rigid highway and airport pavements. Course is taught through
the Web-CT where all course materials, homework, presentations, quizzes and
discussion are displayed. Course lectures are delivered using PowerPoint
presentations and video films.
Design Content
Design process and strategy including design factors and decision criteria,
Design of Flexible Highway Pavements using AASHO, AI, CBR, Multi-layer system
and the crushed stone association method, Design of Flexible Airport Pavements,
Design of Rigid Highway Pavement: Design considerations, PCC pavements, CRC
pavements, design of steel reinforcement for temperature, and expansion joints.
Design methods: PCA, and Corps of Engineers' methods, Design of Rigid Airport
Pavements: Design consideration, aprons, taxiways, and runways. Design Methods:
PCA, FAA, and Corps of Engineers' methods.