Insight into the effects of waste vegetable oil on self-healing behavior of bitumen binder

Title

Insight into the effects of waste vegetable oil on self-healing behavior of bitumen binder

Creator

Xu N.; Wang H.; Chen Y.; Hossiney N.; Ma Z.; Wang H.

Description

The application of waste vegetable oil (WVO) in bitumen has been the subject of research for years, however, the self-healing behavior of WVO modified bitumen (WMB) has not been adequately reported. In this research, molecular dynamics (MD) simulations and laboratory experiments were performed to reveal the effects of WVO on the self-healing behavior of bitumen. Models of base bitumen and WMB were constructed. Further, dynamic calculations were carried out for the self-healing models of base bitumen and WMB both with 10 microcracks. The energy properties, conformation and density of bitumen during the self-healing process were analyzed. Meanwhile, the effects of WVO on the fractional free volume (FFV) of bitumen, the distribution of bitumen components and the mobility of bitumen molecules were investigated. Finally, the modified fatigue-healing-fatigue (FHF) test was conducted to verify the effects of WVO on the self-healing efficiency of bitumen. Results show that Van der Waals forces drive the mobility of bitumen molecules. Along with the disappearance of the central microcrack, the density of the self-healing system gradually increases and finally reaches that of the bulk bitumen. WVO with superior mobility capacity increases the FFV of bitumen and converts asphaltene large aggregated structure into small aggregated structure, which facilitates the mobility of the bitumen during the self-healing process. Thus, the addition of WVO contributes to the self-healing efficiency of the bitumen. The modified FHF test also verified that the self-healing efficiency of bitumen is improved with the presence of WVO. These findings provide further insight into the self-healing behaviors of WMB. 2022

Source

Construction and Building Materials, Vol-363

Date

2023-01-01

Publisher

Elsevier Ltd

Subject

Bitumen; Molecular dynamics; Self-healing behavior; Waste vegetable oil

Coverage

Xu N., School of Highway, Chang'an University, South Erhuan Middle Section, Shaanxi Province, Xi'an City, 710064, China; Wang H., School of Highway, Chang'an University, South Erhuan Middle Section, Shaanxi Province, Xi'an City, 710064, China; Chen Y., School of Highway, Chang'an University, South Erhuan Middle Section, Shaanxi Province, Xi'an City, 710064, China; Hossiney N., Department of Civil Engineering, CHRIST University, Kumbalgodu, Karnataka, Bengaluru, 560074, India; Ma Z., School of Highway, Chang'an University, South Erhuan Middle Section, Shaanxi Province, Xi'an City, 710064, China; Wang H., School of Highway, Chang'an University, South Erhuan Middle Section, Shaanxi Province, Xi'an City, 710064, China

Rights

Restricted Access

Relation

ISSN: 9500618; CODEN: CBUME

Format

Online

Language

English

Type

Article

Identifier

https://doi.org/10.1016/j.conbuildmat.2022.129888

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85143308132&doi=10.1016%2fj.conbuildmat.2022.129888&partnerID=40&md5=48e7332f87a078520f94d3a1df05ce00