About the book
Pavement is one of the essential and key elements of the transportation infrastructure system. Each year billions of dollars are spent on building new pavements, as well as maintaining existing pavements to keep them functional. This great annual investment has urged many transportation agencies to monitor factors that affect a pavement’s performance and to correlate them with a pavement’s behavior throughout its service life. The advantage of tracking such factors is that their effect at early stages of design can be accounted for; and pavement life cycle performance can be accordingly improved. A typical pavement life cycle has three main stages, which are design, construction and operation (service life) stages.
Among the essential factors that influence pavement performance and considered in the design stage are traffic loads, material properties and environmental effects. Pavement designers relay on empirical, mechanistic or empirical-mechanistic design procedures to determine the pavement structure that is required to carry future traffic loads. Although the seasonal variation of pavement material properties has been shown to highly affect pavement performance,many pavement design procedures ignore environmental effects or under-consider them during the design. The fact that the long-term performance of a pavement structure is strongly dependent on the subgrade soil and the pavement layer properties makes changes in these soil and layer properties poses a great concern. This is particularly true in areas experiencing seasonal fluctuation in environmental parameters.
Long-term pavement performance is highly dependent on the quality of construction, materials and workmanship. Pavements built to lower standards always have shorter service lives and higher maintenance cost along their service lives. Assumptions are always made during the design stage that the constructed materials meet the desired specifications. Construction Quality Control/ Quality Assurance (QC/QA) procedures are applied to control the material and construction quality.
Pavement performance during its service life is monitored using a Pavement Management System (PMS). PMS is a program for improving the quality and performance of highway pavements and minimizing their life-cycle cost through the user of good management practices. The basic purpose of a PMS is to achieve the best value possible for the available public funds and to provide safe, comfortable, and economic transportation.
This book intends to provide a comprehensive overview of highway pavements by covering the three stages of the pavement life cycle, design, construction and operation stages. The book will provide information about: Design procedures for flexible and rigid pavements; Impact of environmental factors on pavement performance and how they can be considered in design; Pavement construction QC/QA procedures; and Pavement Management Systems.