Abstract
Asphalt self-healing by encapsulated rejuvenating agents is considered a revolutionary technology for the autonomic crack-healing of aged asphalt pavements. This paper aims to explore the use of Bio-Oil (BO) obtained from liquefied agricultural biomass waste as a bio-based encapsulated rejuvenating agent for self-healing of bituminous materials. Novel BO capsules were synthesized using two simple dripping methods through dropping funnel and syringe pump devices, where the BO agent was microencapsulated by external ionic gelation in a biopolymer matrix of sodium alginate. Size, surface aspect, and elemental composition of the BO capsules were characterized by optical and scanning electron microscopy and energy-dispersive X-ray spectroscopy. Thermal stability and chemical properties of BO capsules and their components were assessed through thermogravimetric analysis (TGA-DTG) and Fourier-Transform Infrared spectroscopy (FTIR-ATR). The mechanical behavior of the capsules was evaluated by compressive and low-load micro-indentation tests. The self-healing efficiency over time of BO as a rejuvenating agent in cracked bitumen samples was quantified by fluorescence microscopy. Main results showed that the BO capsules presented an adequate morphology for the asphalt self-healing application, with good thermal stability and physical-chemical properties. It was also proven that the BO can diffuse in the bitumen reducing the viscosity and consequently self-healing the open microcracks.
Highlights
Bituminous materials are viscoelastic composites mainly used for road and airport pavement construction
Cracking of bituminous materials mainly occurs due to the oxidation of the hydrocarbon compounds of bitumen [3], which is a dark thermoplastic material composed of a solid part called asphaltenes
This paper aims to explore the use of BO obtained from liquefied agricultural biomass waste as bio-based encapsulated rejuvenating agent for the self-healing of bituminous materials
Summary
Bituminous materials are viscoelastic composites mainly used for road and airport pavement construction. These materials include asphalt mixtures, mastics and bituminous binders [1]. Asphalt mixtures are the most used for asphalt pavement construction in the world. Cracking of bituminous materials mainly occurs due to the oxidation of the hydrocarbon compounds of bitumen [3], which is a dark thermoplastic material composed of a solid part called asphaltenes. 2 2of of 15 bitumen [3], which is a dark thermoplastic material composed of a solid part called asphaltenes and a liquid part called maltenes and[4]. During the oxidative additional aand liquid part called maltenes (resins(resins and oils)
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