Extraction and recovery of asphalt binder: a literature review

Abstract

A literature review was conducted on the main aspects of asphalt binder extraction and recovery: i) extraction methods, ii) recovery methods and iii) solvents. The extraction methods include centrifuge, reflux and vacuum and others with particular focus on their effectiveness in dissolving the binder and the potential to modify it. Studies found that the centrifuge was a relatively safe cold extraction method that was fairly effective. For the recovery methods, the rotary evaporator was found to have a good reputation for relative ease of use and less binder modification than for the Abson method. The most commonly used solvents n-propyl bromide and chlorinated solvents, while being reusable, both had reported issues of ineffectiveness as well as major concerns about user safety. Bio-sourced solvents were found to be seldom used and required higher quantities. The study concluded that more research needed to be done in developing solvents.

Reclaimed Asphalt Pavement Binder Extraction and Recovery Evaluation and Their Effects on the Recycling Agent Assessment

“…Automated extraction is becoming more common among road agencies and academic laboratories ( 22 , 60 ). Since ASTM D8159 ( 29 ) lacks a precision criteria or bias to accept the asphalt binder content, the presented research provides data information on repeatability conditions associated with RAP materials.…”

Dosagem do agente rejuvenescedor Sylvaroad com base nas propriedades reológicas de ligante asfáltico envelhecid

“…The binder's recovery, which consists of its separation from the solvent, was carried out by a rotoevaporator. This method is preferred by researchers due to its ability to provide larger sample volumes, leave less residual solvent after the recovery process, and cause less agehardening (Mikhailenko, Ateian and Baaj, 2020). In the rotoevaporation method, the solvent and asphalt binder solution is placed in a rotating flask and distilled through partial immersion in a temperature-controlled water bath.…”

A critical assessment of stiffness modulus and fatigue performance of plant produced asphalt concrete samples using various test methods

“…The binder was extracted from the mixtures and penetration and softening point tests were performed and reported in Table 6. The bitumen extraction procedure is done using chemical solvents; hence, the properties of bitumen after extraction will be somewhat changed (Mikhailenko et al 2020). It is noteworthy to mention that the reclaimed binder from the plant mixtures had often penetrations that were lower or higher than expected with regard to the requirements.…”