Abstract
Bio-oil recycled asphalt binders in road engineering can help solve the problem of oil shortage and reduce the environmental pollution and sustainability. This paper investigated the road performance of the aged asphalt binder by adding bio-oil so that the aged asphalt binder could be reused to reach purpose of reuse. The residual soybean oil was selected as rejuvenator and blended with aged asphalt binder at 0%, 2%, 4%, and 6%, respectively. The results showed that bio-oil increased the penetration of aged asphalt binder, the penetration of bio-oil recycled asphalt binder with a bio-oil content of 6% reached the standard of 70# matrix asphalt binder. The addition of bio-oil reduced the viscosity, mixing and compaction temperature of aged asphalt binder. As a common knowledge, bio-oil helps to increase the lightweight components of the aged asphalt binder, which diminishes the high-temperature rutting resistance of bio-oil recycled asphalt binders. The high-temperature deformation resistance of bio-oil recycled asphalt binders had not decreased linearly with the bio-oil dosage. Meanwhile, the high-temperature performance of the bio-oil recycled asphalt binder with a 6% bio-oil was superior to matrix asphalt binder. Bio-oil increased the light components of the aged asphalt binder, thus reducing the high-temperature rheological properties of bio-oil recycled asphalt binders as the bio-oil dosage increases. The above test results showed that the bio-oil could restore the aged asphalt binder to the initial level to reach the reuse target.
Highlights
As more and more oil resources are exploited, their quantity diminishes
The test results show that A0 has almost no resistance to cracking at low temperatures, and low-temperature performance is improved after adding bio-oil
To return aged asphalt binder to the matrix asphalt binder standard, the quantity of bio-oil must not be less than 6%
Summary
As more and more oil resources are exploited, their quantity diminishes. Petroleum asphalt binders are essential materials in the road industry, and how to reuse road asphalt is a problem to be solved. The most common method is to use a regenerating agent to restore the road performance of aged asphalt binders to achieve the objective of regenerating aged asphalt. Road workers explored and investigated different types of regenerating agents, including bio-oil as a cost-effective regenerating agent [1,2]. Gao analyzed the self-healing mechanism of bio-oil regenerated asphalt binders, and the self-healing time of asphalt binders with different aging times was different. Bio-oil enhances the self-recuring ability of aged asphalt binders [3]. Bio-oil could reduce the content of macromolecules and small molecules of aged asphalt binders, improve the dispersion of aging asphalt molecules, and enhance aged asphalt binders’ road performance and chemical characteristics. Bio-oil recycled asphalt binders could replace petroleum
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