The main factor considered under functional performance is riding quality. These factors include: cracking, faulting, raveling, and so forth.įunctional performance: is an indication of how effectively the pavement serves the user. Structural performance: related to the physical condition of the pavement with respect to the factors that have negative impact on the capability of the pavement to carry the traffic load. Traffic Subgrade soil properties Materials of construction Environmental effects Drainage Reliability Pavement Performance (Loss of serviceability). This method Incorporates various design inputs including : Data were thoroughly analyzed and the results formed the basis for the AASHTO method ِِInterim guide was published in 1961, revised in 1972, further edition 1986, then 1993ĪASHTO Design Method/ Design Considerations Longitudinal and transverse profiles were obtained to determine extent of rutting, surface deflection caused by loaded vehicles moving at very low speeds, Pavement curvature at different speeds, stress imposed on the subgrade and temperature distribution in the pavement layers. Vehicles were driven for thousand repetitions (single axle ( 2, 000 – 30, 000 lb) and tandem (24, 000 – 48,000 lb).ĭata were collected from pavement with respect to extent of cracking and amount of patching required to maintain the section in service. Flexible: HMA surface (1-6 “), well-graded crushed limestone base (0-9”), and uniformly graded sand-gravel subbase (0-6”). Tangents sections with different lengths (> 100 ft). Rigid & flexible A-6 subgrade Four lane divided highway loops. Many types of test section were prepared and tested. It is an effort that was carried out with the cooperation of all states and several industry groups. Chapter 16: Highway Engineering, by Paul Wright & Karen Dixon, 7th Edition, Wiley & sons Instructor:ĪASHTO Method/ Introduction īased on the results of AASHTO road test conducted on Ottawa, Illinois.
#Online flexible pavement design software software#
These tools are easily accessible through the book’s companion Web site, which is constantly updated to ensure that the reader finds the most up-to-date software available.Flexible Pavement Thickness Design / AASHTO Method Source: Chapter 20: Traffic & Highway Engineering by Nicholas Garber and Lester Hoel, Third Edition, Brooks/Cole.
Pavement Design and Materials offers complete coverage of: The characterization of traffic input The characterization of pavement bases/subgrades and aggregates Asphalt binder and asphalt concrete characterization Portland cement and concrete characterization Analysis of flexible and rigid pavements Pavement evaluation Environmental effects on pavements The design of flexible and rigid pavements Pavement rehabilitation Economic analysis of alternative pavement designs The coverage is accompanied by suggestions for software for implementing various analytical techniques described in these chapters. This book focuses on the best-established, currently applicable techniques available. Historically, numerous techniques have been applied by a multitude of jurisdictions dealing with roadway pavements.
Pavement Design and Materials is a practical reference for both students and practicing engineers that explores all the aspects of pavement engineering, including materials, analysis, design, evaluation, and economic analysis. A comprehensive, state-of-the-art guide to pavement design and materials With innovations ranging from the advent of SuperpaveTM, the data generated by the Long Term Pavement Performance (LTPP) project, to the recent release of the Mechanistic-Empirical pavement design guide developed under NCHRP Study 1-37A, the field of pavement engineering is experiencing significant development.