Aged Asphalt Binders Research Articles

Surface Characteristics of Ageing Asphalt Binder Coupling Thermal Oxidation and Ultraviolet Radiation

In this study, styrene-butadiene-styrene (SBS) modified asphalt binder was aged by thermal oxidation coupled with ultraviolet (UV) radiation. Fluorescence microscopy (FM), scanning electron microscopy (SEM) with energy dispersive x-ray (EDX) detector, surface free energy, optical technology, Fourier transform infrared spectroscopy, and dynamic shear rheometer were used to explore the surface characteristics and trace the chemo-rheological evolution of the asphalt binder at various durations of aging. Both FM and SEM could observe two phases of degradation of the polymer under thermo-oxidation. The surface of UV-aged asphalt binder produced more cracks, observed by FM and SEM, and bulged along these cracks and some fragmented blocks appeared. EDX results indicated that the oxygen content of the surface of the asphalt binder increased with increasing aging duration, leading to more oxygen-containing compounds, more carbonyl and sulfoxide groups, increasing polarity, and decreasing contact angle of water droplets on the surface of the asphalt binder. Coupled aging increased the reflectance in all regions from 200 nm to 2,500 nm, while thermo-oxidative aging alone increased the reflectance from 200 to 400 nm and produced the opposite result in the other region. With increased aging duration, UV-aged asphalt binder becomes brighter and thermo-oxidative aged asphalt binder becomes darker. The asphalt binder samples did not discolor much with varying aging duration, and the color difference was more similar than opposite. The results of testing chemo-rheological properties indicated that the addition of UV radiation significantly increased the stiffness and elasticity and produced more obvious effects on the surface characteristics of variously aged binders.

Characterization of nanoscale cracking at the interface between virgin and aged asphalt binders based on molecular dynamics simulations

Low-temperature cracking is a major concern to improve the utilization of recycled asphalt mixture (RAM). A mechanism by which the crack propagates can provide a basis for advanced technological mitigation. Micro-crack formations in the interfacial proximity of the virgin and aged binders have been identified from electron microscopy tests. Atomic force microscopy (AFM) experiment showed the trilayer phases at the virgin-aged binder interface. In this study, molecular dynamics (MD) simulations were conducted to understand the nanoscopic crack propagation characteristics at the virgin-aged binder interface in the asphalt mixture with RAM. It was found that the blended binder of virgin and aged binders, and its interfaces with virgin and aged binders appeared to be the crack propagation zones. The relatively more significant matrix contraction of virgin binder and stiffer aged binder at a low temperature can cause more considerable tensile stress at the blended binder and its interfaces. Consequently, interfacial crack propagation became more profound and decreased the low-temperature cracking resistance.

Analysis of Natural Aging Behavior of Asphalt Binder in Cold and Arid Region

With extremely bad climate and poor geographical environment in cold and arid region, the deterioration and failure of road materials are serious. In order to analyze the characteristics of natural aging behavior of asphalt binder in cold and arid region, the experiments were carried out based on the exposure field test base. The multiscale characterization of virgin asphalt under different natural aging conditions was carried out by means of macromechanical analysis and microchemical composition analysis. The results showed that the effects of natural aging and laboratory simulated aging on asphalt binder properties were similar. There was little effect on the performance of asphalt binder after natural aging one year. The effect of natural aging on asphalt binder in one year was similar to that of laboratory short-term aging. However, the strong UV radiation was a great challenge for asphalt pavement in Northwest China. Wind, dust, rain, and other factors have little effect on asphalt binder aging. Affected by the natural environment, macromolecular structures such as oxygen-containing polar functional groups will form in asphalt binder. The molecular weight of asphalt binder was increased, and the internal molecules of asphalt binder were subjected to large internal friction resistance in the process of movement. The macroscopic physical properties and road performance of asphalt binder become poor.

Connections between asphaltene microstructures in aged asphalt binders and performance-related engineering properties

Numerous studies have been conducted to evaluate the property variations of asphalt binders from different sources and their property evolutions during the aging process. Most existing studies, however, are focused on asphalt binder properties at the macroscopic level. The fundamental mechanisms that drive the property variations and evolutions are seldom explored. In this study, attempts were made to identify the physicochemical origins of property variations in aged asphalt binders. Eight aged asphalt binders from different sources were used for investigation. The asphaltene contents of the binders were determined, and the zero-shear viscosities (ZSVs) of the binders and their maltene phases were tested at different temperatures. The size of asphaltenes in the asphalt binders was examined and approximately quantified with the assistance of scanning transmission electron microscopy (STEM) and image analysis. Solvent was not used in sample preparation; therefore, asphaltene microstructures in the STEM images represent the true states of observable asphaltenes in asphalt binders. It was found that asphaltene content and the ZSV of maltenes can well explain most of the commonly reported rheological properties of asphalt binders, including ZSV, dynamic viscosity, rutting parameter, fatigue parameter, phase angle, crossover frequency, Glover-Rowe (G-R) parameters, etc. However, asphaltene content cannot explain the fatigue performance of asphalt binders, for which the quantity of large-size asphaltene microstructures is the most important factor and maltene viscosity also likely plays a role. Besides revealing the connections between asphalt binder properties and its microscopic characteristics, the findings of the study may be used in material selection and the identification of proper engineering tests for asphalt binders.

Molecular Dynamics Study of the Diffusion between Virgin and Aged Asphalt Binder

The diffusion between the virgin and aged asphalt binder in the recycled asphalt mixture is a crucial factor affecting its macro-mechanical performance. In this study, a combined model of the virgin-aged layered asphalt structure was assembled based on the molecular dynamics (MD) method. A four-component and twelve-category molecule were used to model the asphalt. The diffusion behaviors of the virgin and aged asphalt were characterized by mean square displacement (MSD), diffusion coefficient, relative concentration and cohesive energy density (CED). Results indicated that at the same temperature, the diffusion coefficient of the virgin asphalt was the largest, followed by the virgin-aged asphalt and the aged asphalt. As the temperature increased, the relative concentration on both sides of the virgin-aged asphalt overlapped to a certain extent. The covered lengths of the virgin asphalt were larger than those of the aged asphalt, indicating the diffusion between the virgin asphalt and aged asphalt was mainly manifested as the diffusion from the virgin asphalt to the aged asphalt. The development of CED and the fraction of free volume (FFV) indicated the mutual attractive interactions among the molecules in virgin and aged asphalt layers became strong and the cohesion properties inside the model became better.

Performance of waste plastic bio-oil as a rejuvenator for asphalt binder

Pavement recycling is actively applied on asphalt roads due to ageing problems associated with bituminous binders when exposed to weathering and trafficking during their service life. Recycling of asphalt occurs through rejuvenator agents. This study utilised bio-oil produced from hydrothermal liquefaction of waste plastic films (linear low-density polyethylene - LLDPE) to rejuvenate laboratory-aged bitumen. Initially, the neat bitumen was aged through thermal ageing (Pressure Ageing Vessel – PAV) and then the aged binder was mixed with bio-oil from waste plastics at 5% and 8% bio-oil (BO) by weight of aged binder. All four binders including neat bitumen, aged bitumen, aged bitumen/BO-5% and aged bitumen/BO-8% were analysed for thermogravimetric analysis, Fourier Transform Infra-Red analysis, rheology in the linear viscoelastic region, multiple stress creep and recovery analysis, and linear amplitude sweep analysis. The ageing of neat binder resulted in hardening of the binder; however, the bio-oil rejuvenator softened the aged binder significantly. The thermo-chemical and rheological performance of aged binder was significantly improved after the addition of bio-oil. The outcomes suggest how bio-oil produced from hydrothermal liquefaction of waste plastics (possibly non-recyclable) may serve as potential rejuvenator for aged asphalt binders in an effort to recycle more using non-recyclable material.

Synergistic effect of SBS copolymers and aromatic oil on the characteristics of asphalt binders and mixtures containing reclaimed asphalt pavement

Rejuvenators have been utilized to restore the physical and rheological properties of aged asphalt binders found in the reclaimed asphalt pavement (RAP). Also, the rejuvenators are utilized to enhance the cracking resistance of asphalt containing RAP. In addition, polymers have been efficiently applied to enhance the rutting performance of rejuvenated mixtures. The purpose of this study was to assess the influence of combining SBS copolymers and aromatic oil (AO) at the same time as a hybrid rejuvenator (HR) on the performance of high RAP asphalt binders and mixtures. HR is a mixture of 25% SBS and 75% AO. The properties of the rejuvenated binders were assessed by SARA (Saturates, Asphaltene, Resin, and Aromatics) fractions analysis, Fourier Transform Infrared Spectrum (FTIR), physical tests, high-temperature storage stability test, Dynamic Shear Rheometer (DSR) test, and Bending Beam Rheological (BBR) test. In addition, the mechanical behaviour of the rejuvenated mixtures was assessed using the Indirect Tensile Strength (ITS) test, moisture susceptibility test, resilient modulus test, and wheel tracking rutting test. The results showed that appropriate adjustment of the SARA fractions and SBS copolymer could improve the overall performance of mixtures and binders with high RAP content. However, it is asserted that a field investigation of this compound rejuvenator should be done to further analyze its influence on the long-term field behavior of high RAP mixtures.

Coupled Effects of Gilsonite and Sasobit on Binder Properties: Rheological and Chemical Analysis

Experiences of highway agencies show that the costs of repairing rutting distresses are high. The common solution to overcome this issue is using a modified asphalt binder. The modifier enhances the asphalt binder’s rheological and physical properties but increases the production temperatures of asphalt pavement. Nevertheless, warm mix asphalt (WMA) production at temperatures lower than hot mix asphalt (HMA) could lead to lower aging of asphalt binders. In this study, the physical and rheological properties of modified asphalt binders with different contents of Gilsonite and their combination with Sasobit as a WMA agent were investigated. Accordingly, 5%, 9%, and 13% Gilsonite, as well as 3% Sasobit in combination with Gilsonite, were used to modify asphalt binders. Dynamic shear rheometer (DSR), rotational viscosity (RV), surface free energy (SFE), Fourier-transform infrared spectroscopy (FTIR), and some conventional tests (i.e., penetration grade, softening point, and storage stability) were conducted to evaluate the properties of the binders. The results of chemical analysis tests (i.e., SFE and FTIR) indicated that using Gilsonite and Sasobit as composite modifiers could further improve the thermomechanical properties. The DSR test results also showed that the Gilsonite and its combination with Sasobit improve the high-temperature performance of asphalt binders and, consequently, increase the rutting resistance. However, Gilsonite could raise the asphalt binder elasticity and showed better results when Sasobit was incorporated. In general, Gilsonite increased the asphalt binder stiffness, and consequently, it could reduce the workability and compactability of mixtures. Therefore, the use of Sasobit as a complement for Gilsonite reduces the viscosity of the asphalt binder and enhances the mixture workability. This could pave the way to use Gilsonite in WMA, resulting in more durable and sustainable asphalt mixtures.

Spectroscopic ellipsometry studies on optical constants of crystalline wax-doped asphalt binders

ABSTRACT Asphalt pavement possesses the characteristics of strong sunlight absorption, which lead to the aging of asphalt binder. Asphalt aging is one of the leading causes of the performance deterioration in the asphalt pavement, and the appearance of crystalline wax (paraffin wax) during aging has a significant effect on optical properties (absorption and reflection) of the asphalt binder. In this paper, effects of the crystalline wax on optical properties of the asphalt binder were investigated using the spectroscopic ellipsometry (SE) technique, and a new method for the quantification of the crystalline wax in asphalt was also developed. Cold Lake asphalt doped with different contents of n-alkanes (eicosane, triacontane, and tetracontane) were tested by the SE. The results showed that there is a close linear relationship between the optical constants and wax content of the asphalt binder. In addition, with increasing both the chain length of n-alkanes and their content, the reflection intensity of the asphalt binder decreased, and the refractive index and extinction coefficient increased accordingly. On the whole, ellipsometry-based optical testing is a promising method for rapid and non-destructive identification of wax in asphalt.

Effect of montmorillonite modification on resistance to thermal oxidation aging of asphalt binder

Asphalt binder aging can cause various pavement diseases including cracking, stripping and pothole formation, which reduce the service life of asphalt pavements. Therefore, asphalt binder modification is regarded as an economical and effective method to improve its antiaging properties. In this paper, the Montmorillonite (MMT) modified asphalt binder with the additive amount of 2, 4, and 6 wt% were prepared. Rolling thin-film oven test (RTFOT) and pressure aging vessel (PAV) procedures were carried out respectively to simulate thermal oxidation aging in both short and long terms. Temperature sweep tests using a dynamic shear rheometer (DSR), Fourier transform infrared spectroscopy (FTIR), and atomic force microscopy (AFM) were performed on base and MMT-modified asphalt binders at different aging conditions. Antiaging behaviors were evaluated through the basic physical and rheological indexes, and FTIR and AFM indicators. The antiaging sensitivity and mechanism were also analysed. The results showed that 4 wt% MMT modified asphalt binder exhibits excellent antiaging properties.

Chemical and Rheological Characterization of Asphalt Binders: A Comparison of Asphalt Binder Aging and Asphalt Mixture Aging

The objective of this study was to compare the chemical and rheological properties of asphalt binders recovered from aged asphalt mixtures with the corresponding aged asphalt binders used in those mixtures. Seven plant-produced asphalt mixtures, with unmodified and polymer modified asphalt binders and varying reclaimed asphalt pavement (RAP) content, were compacted and aged in a conventional oven at 85°C for zero (unaged), five, or 10 days. Asphalt binders were extracted and recovered from each aging level for chemical and rheological characterization. Seven blends of virgin asphalt binder and RAP binder were constituted to be similar to those used in the seven plant-produced asphalt mixtures. Subsequently, each asphalt binder blend was aged by rolling thin film oven (RTFO) and pressure aging vessel (PAV) for chemical and rheological characterization. Chemical and rheological characterization included Fourier transform infrared spectroscopy, high and intermediate temperature performance grade (PG), frequency sweep, and linear amplitude sweep (LAS) tests. Asphalt mixtures aged for five and 10 days resulted in asphalt binders that were less aged than similar ones aged by PAV when measured by LAS fatigue parameter ALAS, frequency sweep Glover Rowe (G-R) parameter, and intermediate temperature PG. However, unaged asphalt mixtures yielded asphalt binders with similar properties to those aged in RTFO as measured by high temperature PG. Correlation analysis between asphalt binder and asphalt mixture aging revealed that the G-R parameter has the highest coefficient of correlation among parameters. Further, new aging indices were introduced to capture the effect of polymer modification on aging susceptibility.

Case study: Characterization of short-term field aged asphalt binders in cold mix asphalt pavement

In recent years, rejuvenators have been used in cold asphalt mixtures to assist sustainability efforts. However, most studies on this topic have focused on laboratory prepared samples only. This study characterized the short-term field asphalt binders that were extracted from the surface layer of a field project that utilized cold mix with 100% reclaimed asphalt pavement (RAP) and rejuvenator in Florida, USA. Rheological testing was performed on the extracted RAP binders with and without rejuvenator with respect to high and intermediate temperature performance grading (PG), multiple stress creep recovery (MSCR), frequency sweep, and monotonic fracture tests. Results showed that there was no significant difference in rutting resistance between extracted rejuvenated RAP binder and extracted RAP binder. The rejuvenated RAP binder had lower stiffness and better relaxation properties than the RAP binder suggesting it can soften recycled binders. Furthermore, the rejuvenated RAP binder exhibited higher fatigue life and higher failure strain than the RAP only binder, suggesting that the addition of rejuvenator in the 100% RAP can restore the functionality and flexibility of recycled binders in a short-term field aging period.

Characterization of asphalt binders extracted from field mixtures containing RAP and/or RAS

The use of reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) in the asphalt mixtures is a common practice in the U.S.A. However, there is a controversy to date on how RAP/RAS interact with virgin asphalt binders (VABs) in asphalt mixtures. For mixtures containing RAP/RAS, the aged asphalt binders in RAP and air-blown asphalt binders in RAS alter the performances of the extracted asphalt binders (EABs). Thus, the rheological properties of EABs from these mixtures require more investigation. The focus of this paper was relating the high-temperature properties of EABs from field cores to the corresponding rolling thin film oven aged virgin asphalt binders (RTFO AVABs). Furthermore, a comparison of the effect of RAP and RAS on the high-temperature rheological properties of EABs was another objective. Different asphalt cores were collected from the field within two weeks after the pavement construction process in 2016. These cores represented eight asphalt mixtures with different asphalt binder replacement percentages by RAP, RAS, or both. The asphalt binders were extracted from these mixtures and considered as RTFO AVABs. The high-temperature rheological properties included the temperature sweep and frequency sweep testing and the multiple stress creep recovery testing. The EABs had higher stiffnesses and elasticates than the corresponding RTFO AVABs because of the aged binders in RAP/RAS. The binders in RAP interacted more readily with VABs than RAS binders.

Aging characteristics of neat and modified asphalt binders based on rheological evaluations at intermediate temperatures

This study examined the aging of neat and modified binders at intermediate temperatures. The neat binder was modified using two crumb rubber (CR) and styrene–butadiene–styrene (SBS) contents. The linear and non-linear rheological test results and parameters exhibited different aging susceptibilities for each binder. A new aging/cracking parameter is introduced based on the Christen-Anderson model. The limiting values are defined to assess cracking potential after PAV aging. The SBS binders were highly sensitive to aging, but the addition of sulfur noticeably improved their rheological and cracking properties and aging resistance. Among the studied parameters, four were deemed suitable to assess the aging of asphalt binders at intermediate temperatures in a comprehensive manner.

Oil-grinded recycled kapok fiber as a bio-packing for eco-friendly modified asphalt and its aging resistance behavior

The aging of asphalt binder is one of the vital factors to shorten the service life of asphalt pavement. The researches on delaying the aging of asphalt binder by different fibers are extremely valuable. The recycled kapok fiber (KF) mixed into the asphalt improves the properties of the matrix microscopically and achieves the effect of delaying aging. It still needs to modify KF because of its hygroscopicity and water absorption. It results in the lack of adhesion with the asphalt interface. This paper studies a liquid-phase ball-milling technology for KF with waste engine oil (WEO) as a grinding medium. Through the mechanical force activation, it optimizes the size and surface properties of KF and finally prepares the oil-grinded kapok fiber modified asphalt binder (OKFA). After scanning electron microscope (SEM), X-ray diffractometer (XRD), nitrogen adsorption–desorption method (BET) and Fourier transform infrared spectroscopy (FTIR) tests, the structure of KF and OKF was characterized. It showed that the crystallinity of oil-grinded kapok fiber (OKF) increased by 11.5% compared with KF, and the specific surface area and pore volume increased by 74.3% and 62.5%, respectively. Through the accelerated aging test, nanoindentation and viscosity and other correlation tests were used to evaluate the mechanical properties and aging performance of the modified asphalt. It showed that OKFA performed good aging resistance and potential low-temperature resistance enhancement of asphalt. This research not only solves the resource recycling and reuse of textile fiber waste and follows the new development of energy-saving and environmental protection, but also provides a new direction for improving the performance of asphalt.

The Effect of Bio-Oil on High-Temperature Performance of Bio-Oil Recycled Asphalt Binders

Bio-oil recycled asphalt binders in road engineering can help solve the problem of oil shortage and reduce the environmental pollution and sustainability. This paper investigated the road performance of the aged asphalt binder by adding bio-oil so that the aged asphalt binder could be reused to reach purpose of reuse. The residual soybean oil was selected as rejuvenator and blended with aged asphalt binder at 0%, 2%, 4%, and 6%, respectively. The results showed that bio-oil increased the penetration of aged asphalt binder, the penetration of bio-oil recycled asphalt binder with a bio-oil content of 6% reached the standard of 70# matrix asphalt binder. The addition of bio-oil reduced the viscosity, mixing and compaction temperature of aged asphalt binder. As a common knowledge, bio-oil helps to increase the lightweight components of the aged asphalt binder, which diminishes the high-temperature rutting resistance of bio-oil recycled asphalt binders. The high-temperature deformation resistance of bio-oil recycled asphalt binders had not decreased linearly with the bio-oil dosage. Meanwhile, the high-temperature performance of the bio-oil recycled asphalt binder with a 6% bio-oil was superior to matrix asphalt binder. Bio-oil increased the light components of the aged asphalt binder, thus reducing the high-temperature rheological properties of bio-oil recycled asphalt binders as the bio-oil dosage increases. The above test results showed that the bio-oil could restore the aged asphalt binder to the initial level to reach the reuse target.

Aging Resistances Evaluation of Multi-dimensional Nanomaterials Modified Asphalt by Characterizing Binders Recovered from Aged Asphalt Mixtures

Abstract In terms of the aging susceptibility of asphalt, the multi-dimensional nanomaterials (MDNMs) have been developed to improve the aging resistance of asphalt. In comparison with most of previous studies that are only based on asphalt binder aging simulation methods to evaluate anti-aging properties of MDNMs modified asphalt, aging resistances of MDNM-modified asphalt were evaluated in this research by extracting and recovering binders from their aged asphalt mixtures and then characterizing the aging degree of the extracted binders in terms of physical, rheological, and chemical properties. Organic expanded vermiculite (OEVMT) and nanoparticles (nano zinc oxide [ZnO], nano titanium dioxide [TiO2], and nano silica [SiO2]) were chosen to compose three kinds of MDNMs. And six types of aging patterns (including mixing aging [MA], short-term aging [STA], compacted and loose long-term aging [CLTA and LLTA], and compacted and loose ultraviolet (UV) aging [CUVA and LUVA]) for asphalt mixtures were conducted. The results indicate that the ranking of aging degree for the six types of aging patterns is LUVA > LLTA > CUVA > CLTA > STA > MA. Regardless of the types of asphalt mixture aging patterns, the aging resistances of extracted MDNM-modified asphalt binders are all better than extracted pure asphalt binder, and the composite form of OEVMT combined with ZnO presents more significant improvements on asphalt aging resistance than the other two composite forms (OEVMT + SiO2 and OEVMT + TiO2).

The feasibility of using epoxy asphalt to recycle a mixture containing 100% reclaimed asphalt pavement (RAP)

With the rising cost of pavement materials and increasingly stringent environmental protection and sustainability policies, asphalt recycling technology with high reclaimed asphalt pavement (RAP) content is becoming more essential. This study was designed to explore the feasibility of using epoxy asphalt for the recycling of mixture containing 100% RAP. The performance of the epoxy asphalt recycled mixture and the virgin epoxy asphalt mixture was evaluated and compared. The wheel tracking test and trabecular bending test were carried out to evaluate the high and low-temperature performance. The trabecular fatigue test was adopted to measure fatigue resistance. The indirect tensile test and the semi-circular bending test were carried out to evaluate the moisture susceptibility of the epoxy asphalt recycled mixture. The rutting resistance of epoxy asphalt recycled mixture was found much better than the virgin epoxy asphalt mixture. The low temperature cracking resistance and moisture susceptibility of epoxy asphalt recycled mixture was close to the virgin epoxy asphalt mixture. The influence of epoxy resin components on cracking resistance was more obvious than that of aged asphalt binder. However, the fatigue performance of epoxy asphalt recycled mixture was inferior to the virgin epoxy asphalt mixture. Based on the performance comparison, the epoxy asphalt have the potential to recycle a mixture with 100% RAP content.

Waste chicken fat oil as a biomass regenerator to restore the performance of aged asphalt: rheological properties and regeneration mechanism

This study used waste chicken fat oil (CFO) to regenerate aged asphalt binder. The molecular composition of the CFO was assayed by gas chromatography-mass spectrometry. The performance grade of the CFO-rejuvenated recycled asphalt was compared with that of the original asphalt, while the high-temperature rutting performance of CFO-rejuvenated asphalt was assessed by the multiple stress creep recovery test, and the fatigue cracking ability of the rejuvenated asphalt was determined by a linear amplitude sweep test. It is obvious that CFO can soften aged asphalt. The performance grade of low-temperature 6% CFO-rejuvenated asphalt is superior to that of the original asphalt. The sulfoxide index can be utilised to evaluate the aging recovery degree of CFO-rejuvenated asphalt. The addition of CFO can improve the fatigue properties of aged binder and delay the fatigue damage of asphalt. It is suggested that 6% CFO should be used in recycling aged asphalt binder.

The effect of styrene-butadiene rubber modification on the properties of asphalt binders: Aging and restoring

The aging of asphalt binders has been a critical issue affecting the reuse of reclaimed asphalt pavement (RAP). This paper aims to investigate the modification effect of styrene-butadiene rubber (SBR) latex in restoring the original performance of aged asphalt binders. The binder samples were prepared using short-term aged asphalt binders with 7% SBR latex and 10% ZGSB (a light oil-based rejuvenator), respectively. The rheological ability, low-temperature performance as well as microscopic characteristics of rejuvenated asphalt binders were evaluated through a series of testing devices, involving Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), Fourier Transform Infrared (FTIR) spectrometer, as well as Fluorescence Microscopy (FM). The DSR results demonstrated that adding SBR latex increased the viscosity of aged asphalt while ZGSB decreased it, indicating that SBR improved the rutting resistance of aged asphalt at high temperatures. The BBR test revealed that SBR was as effective as ZGSB in enhancing the low-temperature cracking resistance of aged asphalt, but SBR performed better in the evaluation of anti-aging performance. The FTIR and FM tests demonstrated that the modification effect of SBR latex originated from the elasticity recovery, high stability, and good dispersion in aged asphalt binders.