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Title:

Effect of Ultraviolet (UV) Radiation on Thermal, Chemical, and Rheological Properties of Rubber-Modified Asphalt Binder

Accession Number:

01698446

Record Type:

Component

Abstract:

In this work, the effect of Ultraviolet (UV) rays on samples of asphalt binder mixed with crumb rubber is studied. One neat binder and two sets of rubber-modified samples with 16.6 and 20%wt. are prepared and then inserted inside a QUV Accelerated Weathering Tester for 100 hours. The samples are then collected and changes in their thermal conductivity, chemical indices and rheology are studied using Nanoflash, differential scanning calorimeter, Fourier-Transform Infrared Spectroscopy (FTIR), and dynamic shear rheometer, respectively. Results show that addition of rubber leads to a reduction of specific heat for the two rubberized binders. Specific heat capacities of the three UV aged samples are larger than those of their unaged counterparts, and the 16.6%-aged has the highest value. FTIR spectra of the three unaged samples are very similar, whereas distinct changes occur after UV aging. The normalized absorbance of peak associated with S=O group increases and the peak for the aliphatic group decreases after UV aging, showing some evidences of oxidation due to UV aging. Using crumb rubber in the binder decreases the thermal conductivity and 20%wt. sample is even less conductive compared to the 16.6%wt. At all temperatures above 25°C, aged samples have lower thermal conductivity than the unaged ones, except neat binder which was opposite. Rheological measurements show that complex modulus of the samples increases with addition of rubber particles and also aging. However, 16% rubber-modified sample showed the least increase of modulus after aging, and also the best performance in rutting and fatigue factors.

Supplemental Notes:

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.

Report/Paper Numbers:

19-02848

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Zadshir, Mehdi
Ploger, Desiree
Yu, Xiaokong
Yin, Huiming

Pagination:

6p

Publication Date:

2019

Conference:

Transportation Research Board 98th Annual Meeting

Location: Washington DC, United States
Date: 2019-1-13 to 2019-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References

Uncontrolled Terms:

Complex modulus

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2019 Paper #19-02848

Files:

TRIS, TRB, ATRI

Created Date:

Dec 7 2018 9:23AM