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Title: MINIMIZING PREMATURE CRACKING IN ASPHALTIC CONCRETE PAVEMENT
Accession Number: 00272108
Record Type: Monograph
Abstract: Based on an extensive review of available information from research and field experience, a series of recommendations have been prepared related to material specifications, mix design, structural materials selection and construction requirements that are intended to reduce the possibility of premature cracking of asphaltic concrete pavement. The recommendations assume that the pavement designer is using a suitable design method for selecting the thickness of various pavement layers to provide structural adequacy for the traffic, subgrade support, and climatic conditions. Possible procedures are reviewed for verification of the recommendations for minimizing premature cracking and suggestions are made for an approach to a more extensive future verification program. The recommendations which are suitable for immediate implementation, have been subjected to limited case history and analytical verification, and appear to confirm and quantify recent trends in the field of asphaltic concrete pavement design. The project findings are listed and discussed by type of cracking: fatigue cracking, low temperature cracking, and reflection cracking. Suggestions are made regarding implementation of the recommendations for minimizing premature cracking of asphaltic concrete pavement. Individual highway agencies can evaluate the recommendations against current practice and adopt any changes that are judged to be adequately verified in the report. Future observations of performance would indicate the effect of the changes. Individual modify, or expand specific recommendations. It is also suggested that a nationwide verification investigation be initiated based on Bayesian decision statistics. Two approaches to verifications are discussed: that involving the design of a factorial experimentation program and monitoring of performance using statistical analysis for evaluation of variables; and verification of an analytical model using a small experimental program and case histories of in-service pavements. The recommendations dealing with (a) asphalt content and void content of asphaltic concrete, (b) density of untreated aggregate base courses, and (c) subsurface drainage where accumulation of water is a problem, appear to be well documented and suitable for immediate implementation.
Supplemental Notes: An NCHRP staff digest of the essential findings from the final report on NCHRP Project 9-4, "Minimizing Premature Cracking of Asphaltic Concrete Pavements'" by F.N. Finn, K. Nair, and J. Hilliard, Materials Research & Development, Oakland, Calif. 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.
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Pagination: 8 p.
Publication Date: 1974-3
Serial: Media Type: Digital/other
Features: Figures
(1)
; Tables
(4)
TRT Terms: Old TRIS Terms: Subject Areas: Construction; Highways; Hydraulics and Hydrology; Materials; Operations and Traffic Management; Pavements; Research
Files: TRIS, TRB
Created Date: Sep 30 1974 12:00AM
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