Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Albert Hung; Mingxia Li; Elham H. Fini

doi:10.1021/acssuschemeng.1c04798

Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Albert Hung, Mingxia Li, Elham H. Fini

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.

Original language	English (US)
Pages (from-to)	16918-16925
Number of pages	8
Journal	ACS Sustainable Chemistry and Engineering
Volume	9
Issue number	50
DOIs	https://doi.org/10.1021/acssuschemeng.1c04798
State	Published - Dec 20 2021

Keywords

Aging
Asphalt
Bitumen
FTIR
Healing
Oxidation
Rheology
Sulfur
UV

ASJC Scopus subject areas

Chemistry(all)
Environmental Chemistry
Chemical Engineering(all)
Renewable Energy, Sustainability and the Environment

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10.1021/acssuschemeng.1c04798

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title = "Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen",

abstract = "This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.",

keywords = "Aging, Asphalt, Bitumen, FTIR, Healing, Oxidation, Rheology, Sulfur, UV",

author = "Albert Hung and Mingxia Li and Fini, {Elham H.}",

note = "Funding Information: This work was supported by the National Science Foundation (Award Numbers 1935723 and 1928795). Publisher Copyright: {\textcopyright} 2021 American Chemical Society",

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AU - Hung, Albert

AU - Li, Mingxia

AU - Fini, Elham H.

PY - 2021/12/20

Y1 - 2021/12/20

N2 - This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.

AB - This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.

KW - Aging

KW - Asphalt

KW - Bitumen

KW - FTIR

KW - Healing

KW - Oxidation

KW - Rheology

KW - Sulfur

KW - UV

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ER -

Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Abstract

Keywords

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