# PAVEMENT DESIGN (18CV825)

## PAVEMENT DESIGN

#### Course Learning Objectives: This course will enable students to

1. Gain knowledge about the process of collecting data required for design, factors affecting pavement design, and maintenance of pavement.
2. Excel in the path of analysis of stress, strain and deflection in pavement.
3. Understand design concepts of flexible pavement by various methods (CBR, IRC 37-2001, Mcleods, Kansas ) and also the same of rigid pavement by IRC 58-2002
4. Understand the various causes leading to failure of pavement and remedies for the same.
5. Develop skills to perform functional and structural evaluation of pavement by suitable methods.

### Module -1

Introduction: Desirable characteristics of pavement, Types and components, Difference between Highway pavement and Air field pavement, Design strategies of variables, Functions of subgrade, sub base, Base course, surface course, comparison between Rigid and flexible pavement Fundamentals of Design of Pavements: Stresses and deflections, Principle, Assumptions and Limitations of Boussinesq’s theory, Burmister theory and problems on above.

### Module -2

Design Factors: Design wheel load, contact pressure, Design life, Traffic factors, climatic factors, Road
geometry, Subgrade strength and drainage, ESWL concept Determination of ESWL by equivalent deflection criteria, Stress criteria, EWL concept, and problems on above. Flexible pavement Design: Assumptions, Mcleod Method, Kansas method, CBR method, IRC Method (old), CSA method using IRC-37-2001, problems on above.

### Module -3

Flexible Pavement Failures, Maintenance and Evaluation: Types of failures, Causes, Remedial/Maintenance measures in flexible pavements, Functional Evaluation by Visual inspection and unevenness measurements, Structural evaluation by Benkleman beam deflection method, Falling weight deflecto meter, GPR method. Design factors for runway pavements, Design methods for
Airfield pavement and problems on above.

### Module -4

Stresses in Rigid Pavement : Types of stress, Analysis of Stresses, Westergaard’s Analysis, Modified
Westergaard equations, Critical stresses, Wheel load stresses, Warping stress, Frictional stress, combined stresses (using chart / equations), problems on above. Design of Rigid Pavement: Design of CC pavement by IRC: 58-2002 for dual and Tandem axle load, Reinforcement in slabs, Design of Dowel bars, Design of Tie bars, Design factors for Runway pavements, Design methods for airfield pavements, problems of the above.

### Module -5

Rigid Pavement Failures, Maintenance and Evaluation: Types of failures, causes, remedial/maintenance
measures in rigid pavements, Functional evaluation by Visual inspection and unevenness measurements, wheel load and its repetition, properties of sub grade, properties of concrete. External conditions, joints, Reinforcement, Requirements of joints, Types of joints, Expansion joint, contraction joint, warping joint, construction joint, longitudinal joint, Design of joints.

#### Course outcomes: After studying this course, students will be able to:

1. Systematically generate and compile required data’s for design of pavement (Highway & Airfield).
2. Analyze stress, strain and deflection by boussinesq’s, bur mister’s and westergaard’s theory.
3. Design rigid pavement and flexible pavement conforming to IRC58-2002 and IRC37-2001.
4. Evaluate the performance of the pavement and also develops maintenance statement based on site
specific requirements.

#### Question paper pattern:

• The question paper will have ten full questions carrying equal marks.
• Each full question will be for 20 marks.
• There will be two full questions (with a maximum of four sub- questions) from each module.
• Each full question will have sub- question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module.

#### Textbooks:

1. S K Khanna, C E G Justo, and A Veeraragavan, “Highway Engineering”, Nem Chand & Brothers
2. L.R.Kadiyali and Dr.N.B.Lal, “ Principles and Practices of Highway Engineering”, Khanna publishers
3. Yang H. Huang , “Pavement Analysis and Design”, University of Kentucky.

#### Reference Books:

1. Yoder & wit zorac, “Principles of pavement design”, John Wiley & Sons.
2. SubhaRao, “Principles of Pavement Design”.
3. R Srinivasa Kumar, “Pavement Design”, University Press.
4. Relevant recent IRC codes