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Title:

Effects of Freeze–Thaw Cycles and Antistripping Agents on Hot Mix Asphalt Dynamic Modulus

Accession Number:

01659005

Record Type:

Component

Abstract:

This paper presents findings from a comprehensive model of dynamic modulus (|E*|) of hot mix asphalt estimated with the statistical approaches of joint estimation and mixed-effects. The model consists of a typical sigmoidal master curve and a shift factor. However, it uses a different parametrization of the most commonly used sigmoidal function that is advantageous from a statistical and engineering point of view. Although the model includes the effects of air voids, binder content, gradation, fibers, confinement level, number of freeze-thaw cycles (FTC), and antistripping agents (hydrated lime and a liquid anti-strip), this paper concentrates on the engineering implications specifically related to the effects of FTC (used as an indicator of moisture sensitivity) and antistripping agents.The estimation results indicate that the number of FTC affects three terms of the sigmoid. The contribution of each term changes with reduced frequency but the net effect is always a reduction of log(|E*|) with a given number of FTC for any reduced frequency, with proportionally larger effects at lower reduced frequencies. At any reduced frequency, the higher the number of FTC the lower is log(|E*|). The use of hydrated lime or the liquid anti-strip raises vertically the master curve with respect to the case without any antistripping agent. Hydrated lime is found to be more effective than the liquid anti-strip at counteracting the effects of FTC; however, whether the effects of FTC can be completely counteracted by an antistripping agent depends on the number of cycles and the reduced frequency.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Standing Committee on Surface Requirements of Asphalt Mixtures. Alternate title: Effects of Freeze–Thaw Cycles and Anti-Stripping Agents on Hot Mix Asphalt Dynamic Modulus.

Report/Paper Numbers:

18-01782

Language:

English

Authors:

Archilla, Adrian Ricardo
Corrales-Azofeifa, Jose
Miranda-Argüello, Fabiola
Loria-Salazar, Luis

Pagination:

9p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Freeze thaw cycles

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-01782

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 10:26AM