This document discusses different types of pavement design. It describes the basic AASHTO design methods for both rigid and flexible pavements. For flexible pavement design, it considers factors like traffic volumes, equivalent single-axle loads, layer properties, and thickness. For rigid pavement design, it examines factors like terminal serviceability, equivalent single-axle loads, modulus of subgrade reaction, and slab thickness. The document also outlines some advantages and disadvantages of both rigid and flexible pavements.

1. Pavement Design CE 453 Lecture 28

28. Components Sub-grade (roadbed) course: natural material that serves as the foundation of the pavement structure Sub-base course: above the sub-grade, superior to sub-grade course Base course: above the sub base, granular materials such as crushed stone, crushed or uncrushed slag, gravel, and sand Surface course: upper course of the road pavement, should withstand tire pressures, resistant to abrasive forces of traffic, provide skid-resistant driving surface, prevent penetration of surface water 3 inches to > 6 inches

33. FATIGUE CRACKING

34. RUTTING

35. SHOVING

36. PUMPING