PROCEDURE FOR PREDICTING LABORATORY RETAINED STRENGTH CUT-OFF AND ADDITIVE BENEFIT-COST RATIOS OF MOISTURE-DAMAGED ASPHALT CONCRETE
There is a need to evaluate and use retained strength ratios obtained from laboratory moisture damage tests on asphalt concrete mixes to predict field performance based on highway agency acceptance criteria. Two calculation procedures are described and discussed: (a) retained strength cut-off ratio required for an untreated mix and (b) pavement life benefit-initial cost ratio when antistripping additives are used. Data supplied by six state highway agencies are used for calculating these performance ratios to illustrate typical ranges. Performance ratio procedures make use of pavement thickness design methods and retained strength ratios from laboratory tests as well as the thickness, soil support, regional factor, and terminal serviceability for a specific pavement or overlay to be constructed. Retained strength ratios are related quantitatively to the reduced structural layer coefficients of asphalt concrete. Pavement life is prorated in a simplified version of the moisture damage by stages using Miner's cumulative fatigue damage rule. The calculations show that retained strength cut-off ratios range from 0.59 to 0.95. A range at least this large is expected when considering the differences in thickness design methods and pavement parameters. However, a specific ratio is associated only with a given set of pavement conditions. Calculations of benefit-cost ratios show a range from 1.0 to 2.0. The larger ratios are desirable. The benefit-cost ratios for three of the highway agencies were low enough to question the effectiveness of an additive for the untreated-to-treated retained strength range used. The calculation omethods can be a helpful aid for decision omakers when they are evaluating the results of laboratory moisture damage tests. (Author)
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Availability:
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Flexible Pavement Construction. 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
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Authors:
- Lottman, Robert P
- Publication Date: 1983
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 144-149
- Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
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Serial:
- Transportation Research Record
- Issue Number: 911
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Antistrip additives; Asphalt concrete; Benefit cost analysis; Loss and damage; Moisture content; Pavements; Service life; Strength of materials
- Old TRIS Terms: Pavement life
- Subject Areas: Design; Highways; Materials; Pavements; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 00390803
- Record Type: Publication
- ISBN: 0309035546
- Files: TRIS, TRB
- Created Date: Dec 30 1984 12:00AM