Norambuena-Contreras Jose, Arteaga-Perez Luis E, Guadarrama-Lezama Andrea Y, Briones Rodrigo, Vivanco Juan F, Gonzalez-Torre Irene
LabMAT, Department of Civil and Environmental Engineering, Universidad del Bío-Bío, Avenida Collao 1202, Concepción, Chile.
LPTC, Laboratory on Thermal and Catalytic Processes, Department of Wood Engineering, Universidad del Bío-Bío, Avenida Collao 1202, Concepción, Chile.
Materials (Basel). 2020 Mar 22;13(6):1446. doi: 10.3390/ma13061446.
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.
通过封装再生剂实现沥青自修复被认为是一种用于老化沥青路面自动裂缝修复的革命性技术。本文旨在探索将从液化农业生物质废料中获得的生物油（BO）用作沥青材料自修复的生物基封装再生剂。使用两种简单的滴加方法，通过滴液漏斗和注射泵装置合成了新型BO胶囊，其中BO剂通过外部离子凝胶法在海藻酸钠生物聚合物基质中进行微胶囊化。通过光学显微镜、扫描电子显微镜和能量色散X射线光谱对BO胶囊的尺寸、表面形貌和元素组成进行了表征。通过热重分析（TGA-DTG）和傅里叶变换红外光谱（FTIR-ATR）评估了BO胶囊及其成分的热稳定性和化学性质。通过压缩和低负荷微压痕试验评估了胶囊的力学行为。通过荧光显微镜对BO作为再生剂在开裂沥青样品中的随时间的自修复效率进行了量化。主要结果表明，BO胶囊呈现出适合沥青自修复应用的形态，具有良好的热稳定性和物理化学性质。还证明了BO可以在沥青中扩散，降低粘度，从而自愈开放的微裂纹。
