Enhanced sustainability at the bitumen-aggregate interface using organosilane coating technology

Aldagari, Sand; Hung, Albert M.; Shariati, Saba; Kabir, S.K. Faisal; Ranka, Mikhil; Bird, Richard M.; Fini, Elham H.

doi:10.1016/j.conbuildmat.2022.129500

Cited by 8 publications

(8 citation statements)

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“…In fact, the use of the organosilane modifier disrupted the intermolecular interactions in dry conditions. The latter drawback of organosilane in dry conditions has been recently reported using contact-angle measurements . It was shown that dry-surface adhesion to bitumen of an organosilane-coated glass bead was notably less than that of UV ozone-cleaned glass .…”

Section: Resultsmentioning

confidence: 96%

“…The bio-oil can be dispersed well in a bitumen composite and can increase the intermolecular interactions within a bitumen mixture . In contrast, organosilanes tend toward self-condensation and can only be used in small amounts for coating; otherwise, the repulsions in their thick coating layers worsen the situation at the bitumen–aggregate interface . An environmentally friendly modifier such as a bio-oil derived from waste biomasses, with multi-functional active groups and multi-functional performance, is a good choice to improve the sustainability and durability of bituminous composites by increasing the stone–bitumen adhesion.…”

Section: Resultsmentioning

confidence: 99%

“…An in-depth understanding of the interactions between bitumen components and aggregate surfaces in the presence of modifiers is important for developing built-in mechanisms that improve the durability of a bituminous mixture. In our previous research, adhesive failure at the interface of bitumen and organosilane-coated aggregates in dry conditions was obtained . Here, the effectiveness of two modifiers (an organosilane and a hybrid bio-oil) on bitumen–aggregate adhesion in dry conditions was compared.…”

Section: Introductionmentioning

confidence: 99%

“…The self-condensation reaction of the amino organosilanes such as (3-aminopropyl) triethoxysilane in a bituminous mixture has limited the use of these compounds. Recently, our research team showed the importance of optimum conditions on the effectiveness of an organosilane modifier to enhance the long-term durability of bituminous composites . In that research, contact-angle measurements showed notable hydrothermal stability after hydrolysis for glass beads with the optimum organosilane coating; however, dry surface adhesion to bitumen of an organosilane-coated glass bead was notably less than that of UV ozone-cleaned glass.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous research, adhesive failure at the interface of bitumen and organosilane-coated aggregates in dry conditions was obtained. 22 Here, the effectiveness of two modifiers (an organosilane and a hybrid bio-oil) on bitumen−aggregate adhesion in dry conditions was compared. An experiment was performed using the shear test at the interface to compare the adhesive strength of a bitumen modified with organosilane and a bitumen modified with biooil.…”

Section: ■ Introductionmentioning

confidence: 99%

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Bio-Modifier: A Sustainable Suturing Technology at the Bitumen–Aggregate Interface

Shariati

Aldagari

Fini

2023

ACS Sustainable Chem. Eng.

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Premature failure at the bitumen−aggregate interface is attributed to the surface chemistry of stone aggregates. Bitumen modifiers with high affinity toward aggregates are often used to change the surface chemistry of aggregates, which in turn changes the type and strength of stones' interactions with bitumen.Here, the mechanisms of action and the effects of an organosilane and bio-oil separately on the bitumen−aggregate interface, including their binding to aggregates from one side and to bitumen from the other side, were studied and compared. The binding of bio-oils and organosilanes to aggregates is well documented, as well as their efficacy as anti-stripping agents, but their binding to bitumen is not well understood. Using glass beads as a surrogate for siliceous stones, we obtained laboratory measurements of interfacial strength as measured by resistance to shear forces at the interface of bitumen and silica. Our laboratory measurements showed the highest value for the bitumen modified with bio-oil, followed by the control bitumen with no modification, and the lowest value for the bitumen modified with organosilane. Our molecular modeling calculations showed that the adhesion of bitumen molecules to silica coated with bio-oil was notably stronger (up to 72%) than the adhesion of bitumen molecules to silica coated with organosilane. The higher interfacial strength observed for bitumen with bio-oil is attributed to bio-oil having various functional groups with the ability to form hydrogen bonds and π−π interactions with the aromatic and polar components of bitumen. The study outcomes highlight the importance of modifiers' ability to strongly interact with both aggregates and bitumen. The bio-oil modifier introduced in this work can form a robust bridge between bitumen and siliceous aggregates to improve the adhesive properties, enhancing the sustainability and durability of bituminous composites.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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