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Title: NET ADSORPTION TEST FOR CHIP-SEALING AGGREGATES AND BINDERS
Accession Number: 00715574
Record Type: Component
Availability: Find a library where document is available Abstract: The net adsorption test (NAT) (M-001) developed for the SUPERPAVE mix design procedure is of interest to those concerned with selecting binders and chippings for chip seals (surface dressings). The relevance of the NAT, which is performed on the fine aggregate fraction, for assessing the adhesion performance of chipping sizes of 14 mm (0.55 in.) used for chip seals and the behavior of bitumen emulsions is evaluated. Since the surface chemical composition of 14-mm (0.55-in.) chippings was not found to be statistically different from the composition of the fine aggregate fraction from the crushed chippings, it was accepted that NAT results were indicative of the adhesion performance of the chippings with the binder used in the test. In testing bitumen emulsions the prior removal of the water phase by evaporation was necessary. Results obtained with aggregate-bitumen combinations used for chip sealing in Ireland corresponded to the Strategic Highway Research Program (SHRP) findings that aggregate type has a dominating influence on binder-aggregate adhesion. However, with aggregate-emulsion combinations the emulsion source had a major effect, and the influence and type of emulsion surfactant was assumed to be responsible for the very specific affinity of these binders for aggregates. This is consistent with results of SHRP studies on the effect of antistripping agents on bonding energies. If the percentage net adsorption is determined on the basis of the total binder in the test solution, an overall expression of the binder-aggregate affinity and resistance to moisture damage is provided.
Supplemental Notes: This paper appears in Transportation Research Record No. 1507, Seal Coats and Asphalt Recycling. 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
Monograph Title: Monograph Accession #: 01399822
Language: English
Authors: Walsh, GeraldineO'Mahony, MargaretJamieson, Ian LPagination: p. 1-12
Publication Date: 1995
Serial: ISBN: 0309062012
Features: Figures
(7)
; References
(7)
; Tables
(10)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Jan 5 1996 12:00AM
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