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Title:

Predictive Framework for Modeling Changes in Asphalt Mixture Moduli with Oxidative Aging

Accession Number:

01747762

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

This paper presents a predictive framework for asphalt mixture moduli as a function of aging time with two levels of sophistication. This work is built on the method currently implemented in Pavement mechanistic-empirical (ME) that uses an effective time/frequency concept based on time-aging superposition to model the effect of aging on a mixture’s modulus. Time-aging superposition implies that an asphalt mixture’s modulus mastercurves, corresponding to different aging levels, coincide when they are shifted horizontally on the log-frequency axis. This study improves the accuracy of the existing model by decoupling the time-temperature and time-aging shifts. The new framework also uses the binder dynamic shear modulus |G*| as an aging index instead of the viscosity, which is used in Pavement ME. The |G*| aging index is used to calculate an effective frequency at short-term aging (STA), which is then used in the asphalt mixture sigmoidal model to calculate the corresponding asphalt mixture modulus with aging. The pavement aging model introduced by NCHRP 09-54 predicts log |G*| at 64°C and 10 rad/s for a specific field-aged condition and pavement depth. The proposed framework can use the predicted log |G*| to predict the mixture’s corresponding dynamic modulus (|E*|) at that aging level and pavement depth. Level 1 of this framework requires characterizing the |G*| at STA and calibrating the NCHRP 09-54 pavement aging model as well as measuring the mixture |E*| at STA. Level 2 does not require any binder testing, providing relatively less accurate predictions but relieving some testing requirements.

Supplemental Notes:

© National Academy of Sciences: Transportation Research Board 2020.

Language:

English

Authors:

Saleh, Nooralhuda F
Mocelin, Douglas
Yousefi Rad, Farhad
Castorena, Cassie
Underwood, B. Shane
Kim, Y. Richard

Pagination:

pp 79-93

Publication Date:

2020-10

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2674
Issue Number: 10
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (29)

Subject Areas:

Highways; Materials; Pavements

Files:

TRIS, TRB, ATRI

Created Date:

Aug 13 2020 3:04PM