00743238

Monograph

http://onlinepubs.trb.org...bs/nchrp/nchrp_syn_247.pdf

This synthesis will be of interest to state department of transportation (DOT) construction, geotechnical, materials, and pavement system design engineers, engineering geologists, and research engineers, and others concerned with the constructibility of new pavements over existing subgrades. The synthesis describes current practice for the stabilization of existing subgrades to improve constructibility during interstate pavement reconstruction. It presents information regarding the methods available to evaluate and improve subgrade conditions for the purpose of meeting the constructibility requirements of a reconstruction project. This report of the Transportation Research Board presents data obtained from a review of the literature and a survey of the state DOTs. The synthesis reports on: subgrade evaluation methods including sampling, laboratory, and in-situ test methods, as well as assessment of existing drainage systems; constructibility factors such as existing and proposed pavement types, available equipment, and cost effectiveness of various subgrade stabilization techniques; methods of subgrade improvement including mechanical and chemical stabilization, use of recycled and waste materials, the use of geosynthetics in reinforcement and drainage applications; and construction methods with an emphasis on innovative approaches such as novel sequencing of construction traffic, use of lightweight equipment, and robotics. In addition, several case histories describing applicable pavement reconstruction projects are presented. Finally, suggestions to possibly improve the practice and the identification of research needs are also presented.

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Project 20-5 FY 1995
Topic 27-03

English

81 p.

1997

NCHRP Synthesis of Highway Practice

0309061016

Digital/other

Appendices (2) ; Figures (7) ; Photos (3) ; References (86) ; Tables (32)

Case studies; Construction equipment; Construction management; Cost effectiveness; Data collection; Drainage structures; Field tests; Geosynthetics; Guides to the literature; Innovation; Laboratory tests; Literature reviews; Pavement design; Reconstruction; Recycled materials; Research; Robotics; Sampling; Soil stabilization; State departments of transportation; Subgrade (Pavements); Surveys; Wastes

Interstate Highway System

Constructibility; Stabilization

Construction; Design; Environment; Geotechnology; Highways; Pavements; Research; I22: Design of Pavements, Railways and Guideways; I42: Soil Mechanics; I52: Construction of Pavements and Surfacings

TRIS, TRB, ATRI

Dec 2 1997 12:00AM