Effect of degree of blending on the fatigue performance of epoxy-recycled mixtures with high reclaimed asphalt pavement (RAP) content

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

Construction and Building Materials Pub Date : 2025-06-13 DOI:10.1016/j.conbuildmat.2025.142227

Tao Hu , Ruochong Yang , Jun Yang , Yulou Fan , Yixuan Liu , Jinhong Tan

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引用次数: 0

Abstract

The application of epoxy asphalt presents a promising solution for improving the durability and sustainability of recycled asphalt mixtures with high reclaimed asphalt pavement (RAP) content. The degree of blending (DOB) between virgin and aged asphalt binders serves as a critical indicator of epoxy recycled asphalt mixtures (ERAM) and directly affects their mechanical performance. This study aims to investigate the influence of DOB on the fatigue performance of ERAM and to optimize the mixing process for enhanced fatigue resistance. An orthogonal experimental design was adopted to evaluate the effects of preheating temperature, mixing temperature, and mixing time on the macroscopic properties. Semi-circular bending (SCB) and repeated SCB (R-SCB) tests were conducted to assess cracking and fatigue resistance, respectively. Additionally, DOB was quantitatively analyzed at the microscale using energy-dispersive spectroscopy (EDS) with nano-TiO₂ powder and nano-clay tracers. Results showed that the mixture achieves optimal overall performance at a mixing temperature of 170°C and a mixing time of 120 s. EDS results and regression analysis revealed that increasing mixing temperature and time effectively improved DOB, peaking at 81 %, while a significant negative linear correlation was observed between DOB and fatigue performance. This is attributed to the reduction in effective epoxy content within the mixture as DOB increases, thereby compromising fatigue resistance, which highlights the necessity of optimizing mixing parameters to balance the strength and durability of ERAM. This study contributes to the advancement of sustainable pavement materials.

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掺合度对高再生沥青路面环氧再生混合料疲劳性能的影响

环氧沥青的应用为提高高再生沥青路面（RAP）含量的再生沥青混合料的耐久性和可持续性提供了一种有前途的解决方案。原始沥青与老化沥青粘结剂之间的共混度（DOB）是环氧再生沥青混合料（ERAM）的重要指标，直接影响其力学性能。本研究旨在探讨DOB对ERAM疲劳性能的影响，并优化混合工艺以提高其抗疲劳性能。采用正交试验设计，考察了预热温度、搅拌温度和搅拌时间对复合材料宏观性能的影响。分别进行了半圆弯曲（SCB）和重复SCB （R-SCB）试验，以评估其抗裂性和抗疲劳性。此外，采用纳米tio2粉和纳米粘土示踪剂，利用能谱仪（EDS）在微尺度上定量分析了DOB。结果表明，混合温度为170℃，混合时间为120 s时，混合料的综合性能最佳。EDS结果和回归分析表明，增加混合温度和混合时间可以有效提高DOB，峰值为81 %，而DOB与疲劳性能之间存在显著的负线性相关。这是由于随着DOB的增加，混合物中有效环氧含量减少，从而降低了抗疲劳性，这突出了优化混合参数以平衡ERAM的强度和耐久性的必要性。本研究有助于可持续路面材料的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.