Understanding the low-temperature fracture behavior of rejuvenated high viscosity modified asphalt utilizing a combined microstructure-component analysis

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-09 DOI:10.1016/j.conbuildmat.2025.140717

Mingjun Hu , Shize Ji , Yiren Sun , Kai Zhu

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引用次数: 0

Abstract

This study aims to establish the correlation between the low-temperature fracture behavior of rejuvenated high viscosity modified asphalts (HVMAs) and their microstructures and components. Various rejuvenated HVMAs were prepared using two types of oil-based rejuvenators and two types of polymer-based rejuvenators, and the low-temperature fracture performance was investigated using the force-ductility test. Then, the Fourier transform infrared spectroscopy, gel permeation chromatography, fluorescence microscopy, and atomic force microscopy were employed to study the chemical composition, molecular composition, and microstructure of rejuvenated HVMAs. Finally, the relationship between the low-temperature fracture performance and microstructure/component characterizations of rejuvenated HVMAs was established. The results indicate that the effect of oil-based rejuvenators on the low-temperature toughness of rejuvenated HVMAs are limited, whereas polymer-based rejuvenators significantly enhance the low-temperature toughness of rejuvenated HVMAs. Oil-based rejuvenators can regulate asphalt components and promote colloidal structure stability, but they cannot rebuild the polymer phase structure. In contrast, polymer-based rejuvenators not only supplement polymer molecules but also facilitate polymer phase structure reconstruction. Larger-sized polymers contribute more to the reconstruction of polymer network structures, thereby dominating the improvement of low-temperature performance in rejuvenated HVMAs. Higher proportion of light components and more effective polymer reconstruction in polymer-based waste rubber oil (SWRO) lead to better rejuvenation effects compared to polymer-based waste cooking oil (SWCO). This study provides theoretical guidance for improving the low-temperature performance and promoting the efficient application of reclaimed asphalt mixtures.

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利用显微结构-组分联合分析来了解回用高粘度改性沥青的低温断裂行为

本研究旨在建立回火高粘度改性沥青（hvma）低温断裂行为与其微观结构和组分之间的关系。采用两种油基回复性剂和两种聚合物基回复性剂制备了不同类型的回复性hvma，并通过力延性试验研究了低温断裂性能。然后，利用傅里叶变换红外光谱、凝胶渗透色谱、荧光显微镜和原子力显微镜对返青hvma的化学组成、分子组成和微观结构进行了研究。最后，建立了回火hvma低温断裂性能与微观组织/成分表征之间的关系。结果表明，油基恢复剂对活化hvma低温韧性的影响有限，而聚合物基恢复剂能显著提高活化hvma的低温韧性。油基恢复剂可以调节沥青组分，促进胶体结构的稳定性，但不能重建聚合物相结构。相比之下，聚合物基的返老还童剂不仅补充了聚合物分子，而且促进了聚合物相结构的重建。更大尺寸的聚合物对聚合物网络结构的重建贡献更大，从而主导了再生hvma低温性能的提高。聚合物基废橡胶油（SWRO）比聚合物基废食用油（SWCO）具有更高的轻组分比例和更有效的聚合物重建，因此再生效果更好。本研究为改善再生沥青混合料的低温性能，促进其高效应用提供了理论指导。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.