Draft TRH 4: Structural Design of Flexible Pavements for Interurban and Rural Roads, 1996 by Committee of Land Transport Officials (COLTO)
The structural design of flexible pavements for interurban and rural roads includes determining the appropriate layer thickness and composition.
Flexible pavements are made of several layers of different materials that can "bend" or "deflect" due to traffic loads. This makes them less likely to be damaged and requires fewer repairs over time.
The main design factors for flexible pavements are stresses due to traffic load and temperature variations. Other factors that influence pavement design include:
Loading, Environment, Materials used, Wheel load, Axle configuration, Contact pressure, Vehicle speed, Repetition of loads, Subgrade type, Temperature and precipitation.
The structural design of a flexible pavement consists of:
Determining the pavement's suitable thickness
Distributing wheel-load pressures to prevent the subgrade from deforming
Transmitting wheel load stresses to the lower layers by grain-to-grain transfer
Spreading the concentrated aircraft wheel loads throughout their depth
The steps of flexible pavement construction are:
Sub-grade Course Construction
Sub-base Course Construction
Base Course Construction
Application of Prime Coat
Binder Course Construction
Application of Tack Coat
Surface Course Construction
The base course is an important layer of pavement structure. It distributes the loads from top layers to the underneath Subbase and sub-grade layers. It provides structural support for the pavement surface.
Call Number: 629.13634 SOUT
ISBN: 1868442187
Publication Date: 1996