Developing an aging model to evaluate engineering properties of asphalt paving binders

Citation
Js. Chen et Ls. Huang, Developing an aging model to evaluate engineering properties of asphalt paving binders, MATER STRUC, 33(233), 2000, pp. 559-565
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS AND STRUCTURES
ISSN journal
1359-5997 → ACNP
Volume
33
Issue
233
Year of publication
2000
Pages
559 - 565
Database
ISI
SICI code
1359-5997(200011)33:233<559:DAAMTE>2.0.ZU;2-A
Abstract
Oxidative aging of asphalt is a primary cause of binder hardening in paveme nts, thus contributing to various forms of pavement failures. An essential element of predicting long-term pavement performance is to understand binde r oxidative aging and its effect on engineering properties. Five asphalt bi nders were evaluated relative to their changes in engineering and chemical properties in pavement service. Laboratory rolling thin-film oven test (RTF OT) and pressure aging vessel (PAV) test were conducted to simulate the in- situ pavement aging. In addition, a cest road was constructed for this stud y to investigate the real aging process in the field. Comparable data were shown between field binders and laboratory binders aged at temperature 60 d egreesC under pressure 20 kg/cm(2). The aging time of asphalts in PAV depen ded on how long pavements were used in the field. This paper was to determi ne the temperature and pressure used for PAV to simulate aging condition in the field. A good correlation between field-service and laboratory aging d uring test road project was found. An aging model was proposed to predict t he changes in paving binder's properties during field age hardening. Result s were shown to give a close fit with experimental data from both laborator y and field aging tests. This model allowed highway engineers to quantify t wo essential characteristics of binder aging: the aging rate and the ultima te degree of changes in binder properties due to aging.