Effect of different rejuvenators and aging methods on the physicochemical properties of bitumen assessed by infrared spectroscopy and rheological analysis

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

Construction and Building Materials Pub Date : 2025-10-02 DOI:10.1016/j.conbuildmat.2025.143796

Lukas Perfler , Bozena Cuk , Georgi Chankov , Roland Traxl , Peter Hirzinger , Roman Lackner

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引用次数: 0

Abstract

The use of high Reclaimed Asphalt Pavement (RAP) contents during the production of flexible pavements can lead to premature damages, such as crack formation, due to the presence of aged bitumen. As a remedy, rejuvenators are commonly employed to minimize these negative effects and are claimed to be capable of restoring the original rheological behavior of the asphalt binder. In this study, 70/100 penetration-grade bitumen samples are artificially aged by Rolling Thin Film Oven Test (RTFOT), Pressure Aging Vessel (PAV), and Universal Simple Aging Test (USAT) and subsequently rejuvenated by five different rejuvenators (three bio-based, one mineral-oil based, and one synthetic product) from renowned manufacturers, considering different degrees of aging as well as different amounts and types of rejuvenators. Infrared (IR) spectroscopy provided insight into the chemical homogeneity of the bitumen-rejuvenator mixtures as well as the interaction between the aged bitumen and rejuvenators. Moreover, by identifying characteristic peaks in the IR spectra of the rejuvenators, a semi-quantitative determination of the rejuvenator content of bitumen-rejuvenator mixtures is established, regardless of the degree of aging. Rheological testing, on the other hand, provided insight into the effect of aging and rejuvenation on the mechanical properties, such as complex shear modulus and phase angle. Based on the results, the rejuvenation effect on the physical and chemical properties of the long-term and extended aged bitumen is strongly dependent on the type and dosage of rejuvenator, however, a full recovery cannot be observed because of the dosages being different when aiming at the restoration of the complex shear modulus or the phase angle of the original bitumen and the generally only slightly affected carbonyl and sulfoxide peaks. Notably, significant changes in the chemical functional groups were also observed during the rejuvenation process, indicating a chemical interaction between the binder and rejuvenator.

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用红外光谱和流变学分析方法研究了不同回春剂和老化方法对沥青理化性质的影响

在柔性路面的生产过程中使用高含量的再生沥青路面（RAP）会导致由于老化沥青的存在而导致裂缝形成等过早损伤。作为补救措施，通常使用恢复剂来减少这些负面影响，并声称能够恢复沥青粘合剂的原始流变行为。本研究采用滚膜炉（RTFOT）、压力老化容器（PAV）和通用简单老化试验（USAT）对70/100渗透级沥青样品进行人工老化，然后根据不同的老化程度、不同的返老还老剂的数量和类型，使用来自知名制造商的五种不同的返老还老剂（三种生物基、一种矿物油基和一种合成产品）进行返老还老。红外（IR）光谱可以深入了解沥青-再生剂混合物的化学均匀性，以及老化沥青与再生剂之间的相互作用。此外，通过识别再生剂的红外光谱特征峰，建立了沥青-再生剂混合物中再生剂含量的半定量测定方法，而不考虑老化程度。流变学测试，另一方面，提供洞察老化和回春对力学性能的影响，如复杂剪切模量和相角。结果表明，再生剂的种类和用量对长期和延长老化沥青理化性质的恢复效果有很强的依赖性，但在恢复原始沥青的复合剪切模量或相位角时，由于用量不同，一般只对羰基峰和亚砜峰有轻微影响，因此不能完全恢复。值得注意的是，在返老还童过程中也观察到化学官能团的显著变化，表明粘合剂和返老还童剂之间存在化学相互作用。

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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.