379
Views
13
CrossRef citations to date
0
Altmetric
Research Article

Preparation and investigation on terminal blend asphalt binders with high content of activated crumb rubber

, , , , ORCID Icon &
Article: 2020271 | Received 18 Aug 2021, Accepted 13 Dec 2021, Published online: 31 Dec 2021
 

ABSTRACT

Crumb rubber (CR), as a recycled rubber product manufactured from scrape tires, has been diffusely applied in asphalt binder for modification due to the environment benefit and performance improvement. To improve the content of CR and maintain the road performance of asphalts, CR was first treated with waste oil and then activated using microwave, named as waste oil pre-expanded and microwave activated CR (PMACR). Subsequently, the high-content (50–70%) PMACR-modified asphalts were prepared using terminal blend (TB) process. The components and microtopography of three CRs were investigated by Fourier Transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) tests. The rheological properties, high- and low-temperature performances, fatigue resistance, cohesion characteristic, storage stability of asphalts with various PMACR contents were examined. The results demonstrate that the high-content PMACR-modified asphalts are successfully manufactured in the laboratory, in which the PMACR content is approximately 70% by weight of matrix asphalt. With the increase of PMACR, the high- and low-temperature performance, fatigue resistance of TB PMACR-modified asphalts are greatly improved. When the content is up to 60%, the softening point difference of top and bottom of asphalt is less than 2.5 °C and the viscosity value of less than 2.5 Pa·s at 180 °C, which indicates high-content PMACR-modified asphalts pose sound compatibility and workability.

Acknowledgement

This work was supported by National Natural Science Foundation of China [grant number 51878163]. The authors greatly appreciate National Demonstration Center for Experimental Road and Traffic Engineering Education (Southeast University) in Nanjing, China.

Disclosure statement

No potential conflict of interest was reported by the authors.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.