Aging Resistance Of Asphalt Binder Research Articles

Multiscale characterization of the UV aging resistance and mechanism of light stabilizer-modified asphalt

Abstract To clarify the effect and mechanism of hindered amine light stabilizer (HALS) on the UV aging behavior of asphalt binder, T622-HALS was selected as the modifier for UV aging resistance of asphalt. The physicochemical properties and microstructure of T622 light stabilizer were comprehensively analyzed. The light stabilizer-modified asphalt was prepared and placed in the UV radiation chamber for UV aging treatment. Scanning electron microscope and atomic force microscope were used to analyze the microscopic morphology evolution of light stabilizer-modified asphalt induced by UV radiation. The thermal properties and functional group composition changes in light stabilizer-modified asphalt during UV aging were studied by using the thermogravimetric and infrared spectroscopy combined testing system. The decay laws of the physical and rheological performances of light stabilizer-modified asphalt were studied during UV aging process, and the effect of light stabilizer on the UV aging behavior of asphalt binder was clarified. The research results indicated that HALSs could alleviate the microcracks and roughness change on the surface of asphalt and reduce the content of functional groups such as carbonyl and sulfoxide in asphalt. Furthermore, HALS could reduce the value difference of physical and rheological properties of asphalt before and after UV aging, significantly improving the UV aging resistance of asphalt binder.

Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

AbstractPolymer modified asphalt containing dynamic chemical bonds has the potential to increase the service life of asphalt pavement due to its excellent self‐healing ability. The effect of this self‐healing accelerator with dynamic chemical bond on the rheological properties and aging resistance of asphalt binder is still unclear. In this study, a self‐healing polyurea elastomer (PUA) modified asphalt containing dynamic disulfide bonds was prepared. The high‐ and low‐temperature performance and fatigue resistance of PUA modified asphalt were studied through multiple stress creep, low‐temperature bending beam rheometer, mechanical glass transition temperature, and linear amplitude scanning tests. Moreover, considering the service environment of asphalt over a wide temperature range (−30–70°C), three rheological aging indices (RAI) were proposed. At the same time, the aging resistance of PUA modified asphalt was evaluated by chemical aging index (CAI) based on carbonyl and sulfoxide groups. Finally, a linear relationship is established between RAI and CAI over a wide temperature range. The experimental results show that self‐healing accelerators can increase the resistance to permanent deformation of asphalt by 47.41% and the fatigue resistance by 88.54%. The S value of PUA modified asphalt decreased by at most 33.21% and the m value increased by at most 35.23% compared with BA at −18°C. Moreover, PUA can improve the long‐term thermal oxygen aging resistance of asphalt binders by at least 38.33% over a wide temperature range.Highlights Rheological properties of self‐healing polyurea elastomer modified asphalt. Aging resistance of self‐healing polyurea elastomer modified asphalt. Proposed rheological aging indices for different temperature ranges. Clarified the correlation between chemical–rheological aging indices.

Nanoscale evolution of rubber-oil modified asphalt binder after thermal and UV aging

Thermal oxidation and ultraviolet exposure cause complex micro-scale chemical changes in asphalt binders, leading to severe deterioration of pavements. The aging-induced evolution of nanoscale domains in asphalt binders was investigated using multiple nanoscale characterizations. This in turn provides insights to develop means of alleviating the aging of asphalt binders to extend pavement service life. The chemical composition, surface topography, and mechanical properties of four asphalt binders (base asphalt and modified asphalt with bio-oils and crumb rubber) are investigated by atomic force microscopy during thermal aging and UV aging and a combination thereof. It was shown that the three domains in the asphalt binder react differently to aging. Abundant carbonyl and sulfoxide compositions are observed in the aged base asphalt binder, which is mainly generated and concentrated in the para domains. The addition of rubber and bio-modified rubber reduces the formation of aging-related compositions in para domains, thereby enhancing the aging resistance of asphalt binder. Aging also significantly changes the surface roughness and domain structures of asphalt binders. Furthermore, it was shown that the domain stability during thermal aging and UV aging can be enhanced by crumb rubber and bio-oils, respectively. Nano-mechanical characterization shows the surface of asphalt binders becomes stiffer, and its adhesion is reduced after aging. Significant reduction (up to 26%) in latter aging indicators was observed with the bio-modifier used in rubberized asphalt. This paper provides insights pertaining to the aging-induced evolution of asphalt binders while examining the efficacy of bio-modification of rubberized asphalt to delay aging. It is recommended to include hybrid aging in future studies and to test bio-modified rubberized asphalt at a larger scale.

Performance of Oil-Absorbing organogel Polystyrene-Stearyl methacrylate as a fume suppressant of asphalt binder

Hazardous fumes can be generated during the high-temperature construction of asphalt pavement. Various fume suppressants have been developed, but many may compromise the performance of asphalt binder, which shortens the service life of asphalt pavement. This study aims to investigate the performance of a novel fume suppressant, namely oil-absorbing organogel polystyrene-stearyl methacrylate (P(S-SMA)), which can reduce the construction fumes of asphalt binder while maintaining good rheological performance. The results of the Fourier Transform Infrared Spectroscopy (FT-IR), Fluorescence Microscopy (FM) and asphalt fume mass tests showed that adding P(S-SMA) can improve the aging resistance of asphalt binder and reduce the particles (≥1 μm) and volatile organic compounds (VOCs) released up to 19.6 % and 30.4 % within 1 h, respectively. The rheological test results indicated that P(S-SMA) could effectively improve the viscoelastic properties, high-temperature performance and fatigue resistance of asphalt binder due to the combination of “supporting” and “hardening” effects after adding P(S-SMA). With 5% P(S-SMA) added, elastic and viscosity properties were increased by 90.6 % and 25.3 % and fatigue life was increased by 38.9 % and 26.4 % at the strain levels of 2.5% and 5%, respectively. This study proved the feasibility of using P(S-SMA) as a novel performance-enhancing fume suppressant of asphalt binder.

Investigating the Addition of Organomontmorillonite Nanoclay and Its Effects on the Performance of Asphalt Binder

Asphalt binder aging is a complex phenomenon that plays an essential role in reducing flexible pavement serviceability. The aging resistance of asphalt binder can be enhanced through the binder modification. This research investigates the impact of aging on unmodified and organo-montmorillonite (OMMT) nanoclay modified asphalt binders. In this study, laboratory aging is carried out for asphalt binders modified with two types of OMMT nanoclays at different dosages (2% and 4% by weight of the binder). The asphalt binders are subjected to short-term and long-term aging using a rolling thin-film oven and pressure aging vessel equipment. Rheological properties of the aged and unaged binders are determined using a dynamic shear rheometer. In addition, storage stability, full performance grading, and rutting resistance of the binders are evaluated and compared. Aging indices were calculated to investigate the aging behavior of the unmodified and modified binders. The results showed that the montmorillonite nanoclay-modified asphalts had improved resistance to aging compared with the unmodified binder.

Modeling and optimization of rheological properties and aging resistance of asphalt binder incorporating palm oil mill waste using response surface methodology

Modeling and optimization of rheological properties and aging resistance of asphalt binder incorporating palm oil mill waste using response surface methodology

Exploring the consequences of reduced aging on the performance of warm mix asphalt binders

ABSTRACT Warm mix asphalt (WMA) technology has proven to be a viable alternative to asphalt pavement production due to its lower mixing and compaction temperatures. However, the performance of asphalt binders is a concern linked to WMA technology due to its reduced aging effect. This study investigates the impact of redcued aging temperature on the performance of two different WMA additives blended with VG30 binder. Fourier transform infrared spectroscopy (FTIR) was performed to check changes in chemical composition of asphalt binder due to aging. Performance of the WM modified asphalt binders was assessed using linear amplitude sweep (LAS), multiple stress creep and recovery (MSCR), and bitumen bond strength (BBS) tests. FTIR analysis showed that used WMA additives increases the aging resistance of asphalt binder. Test results revealed that the application of Rediset enhanced the fatigue performance compared to neat and Sasobit modified asphalt binder. On the other hand, Sasobit decreased the non-recoverable creep compliance (Jnr) and increased the percent recovery (%R), whereas the contrary trend was observed with the addition of Rediset. It was found that Rediset exhibits the antistripping properties thereby improving the bond between asphalt binder and the aggregate, even at reduced production temperature.

Enhanced oxidation aging resistance of asphalt binder with slow-release porous calcium carbonate microspheres loaded with asphalt rejuvenator

To enhance the oxidation aging resistance of asphalt binder, slow-release porous calcium carbonate (CaCO3) microspheres loaded with asphalt rejuvenator were proposed. The porous calcium carbonate microspheres fabricated by a double decomposition method regulated by polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) were used as carriers for the asphalt rejuvenator. The test results showed that the porous CaCO3 microspheres possessed higher specific surface areas and porosities, and the weight ratio of the rejuvenator loaded on the CaCO3 microspheres was up to15%. Frequency sweep test results showed that the complex modulus of the asphalt binder added with rejuvenator-loaded CaCO3 microspheres decreased after aging. When the content of the CaCO3 microspheres added in asphalt binder reached 70%, the complex modulus is even less than that of neat asphalt. Additionally, the slow-release mechanism of the CaCO3 microspheres loaded with rejuvenator was studied based on molecular dynamics simulations. The simulation results also showed that the composition and structure of the molecule played an important role in the diffusion ability. This study provides a reference for developing a new method to delay the oxidation aging of asphalt, and it provides theoretical and experimental data support for the design of oxidation-aging resistance asphalt mixtures.

Performance evaluation of asphalt binder and mixture modified by pre-treated crumb rubber

This work presents a laboratory and field study on the performance of the asphalt binder and mixture modified by pre-treated crumb rubber. Initially, a mechano-chemical method was employed to pre-treat crumb rubber, intending to increase its surface activity and compatibility with asphalt binder. Subsequently, the properties of asphalt binders and mixtures modified by the pre-treated crumb rubber were evaluated systematically. Test results showed that the incorporation of pre-treated crumb rubber resulted in the reduced penetration value, higher softening point, enhanced tensile performance, improved elastic recovery, and greater aging resistance of asphalt binder. Additionally, the asphalt mixtures modified by pre-treated crumb rubber demonstrated excellent road performance. Furthermore, the developed asphalt mixtures were successfully applied in practical engineering, validating the feasibility and practicality of the modified asphalt mixture by pre-treated crumb rubber.

Effect of rubber powder modification on the aging resistance of asphalt binder

The rubber powder produced by waste rubber was used to modify asphalt, which was conducted in aging test. The effect of rubber powder modification on the aging resistance of asphalt binder was studied by the means of basic physical properties test, dynamic shear rheological test and infrared spectrum analysis. Results indicate that the addition of rubber powder can reduce the degradation of aromatic, which makes the rubber powder modified asphalt shows better aging resistance and lower temperature sensitivity. After aging, the change of rheological properties of rubber modified asphalt is relatively small, and it also shows a stable high temperature performance.

Effect of phenolic resin on the rheological, chemical, and aging properties of SBR-modified asphalt

In this study, the effects of phenolic resin (PF) on the permanent deformation and short-term aging resistance of SBR-modified asphalt binder were investigated. Multiple stress creep recovery (MSCR) tests, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC) were performed to investigate the effect of PF on the deformation resistance and aging resistance of SBR-modified asphalt with PF (S4P3). The results show that PF can significantly improve the permanent deformation resistance and aging resistance of the asphalt binder. In addition, S4P3 showed different molecular weight changes during the aging process, and the percentage of large molecular size (LMS) in asphalt has a significant impact on the deformation recovery ability and temperature sensitivity of asphalt.

Coupling effects of wasted cooking oil and antioxidant on aging of asphalt binders

The service life of asphalt pavement will be reduced with the aging of the asphalt binder. In this study, wasted cooking oil (WCO) and an antioxidant (Tns-(2.4-di-tert-butyl)-phosphite, 168) are utilized to retard aging of 60/80 pen grade asphalt binder and SBS modified asphalt. The influences of short-term aging at high temperature (180°C, 5 h) on physical and chemical properties of asphalt binder with WCO and 168 are investigated. Experimental results showed that aging resistance of asphalt binder with WCO and 168 can be improved effectively. The chemical composition and molecular weight of asphalt binder are distinguished by Fourier transform infrared (FTIR) spectroscopy and Gel Permeation Chromatography (GPC). The results indicated that no new substances are obtained when WCO and 168 added to the asphalt binder. The molecular weight of asphalt binder containing WCO and 168 after aging could be achieved at the level of unaged asphalt binder. Furthermore, grey relational analysis is used to investigate correlation coefficients between increment of carbonyl index (ICI) and increment of softening point (ISP), ductility aging ratio (DAR), penetration aging ratio (PAR), increment of sulfoxide index (ISI) and growth rate of LMS (LAI). The results indicated that ICI, ISI, LAI and DAR are reliable methods to evaluate the aging resistance of asphalt binder.

Laboratory evaluation of the effects of short-term aging on high temperature performance of asphalt binder modified with crumb rubber and rice husk ash

This Paper aims to analyze the influence of the short-term aging on the physical and rheological characteristics of asphalt containing a combination of crumb rubber and rice husk ash at high temperature. To simulate the aging on a short term in the laboratory, the rolling thin film oven test was conducted. Obtained results indicated that adding CR and RA had significant positive effect on the aging resistance of asphalt binder through increasing penetration aging ratio (PAR) values. Nevertheless, adding CR and RA reduced softening point increment (SPI), viscosity aging index (VAI), as well as the rutting factor aging index (AIOR).

Surface functionalization of silica nanoparticles to enhance aging resistance of asphalt binder

Abstract Oxidation aging of asphalt pavement is among most prevalent factors causing pavement distresses. Introduction of silica nanoparticles (SNPs) has been found promising to reduce oxidation aging of asphalt binder. However, the effectiveness of SNPs is limited by their poor dispersion caused mainly by SNP agglomeration requiring significant mechanical energy in processing to ensure dispersion. This paper examined merits of surface functionalization of SNPs with (3-aminopropyl) triethoxysilane (APTES) to improve its dispersion in asphalt binder using conventional processing techniques at relatively high loading of SNPs with low mechanical energy input. The morphology, size, amount of amine functional groups of APTES surface-modified SNPs (APTES-SNPs) were characterized and optimized by scanning electron microscope (SEM), dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR) and fluorescence measurement. The comparison between the surface-modified and pristine SNPs on the anti-aging and rheological properties of asphalt binder was conducted. The asphalt binders which contained APTES-SNPs demonstrated much better resistance to oxidative aging as evidenced by enhanced rheological properties compared to those containing pristine SNPs. The findings from this research provides insights as to the effect of APTES-SNPs on aging resistance of asphalt binder.

The Effect of Zinc Stearate Modification on Aging Characteristics of Asphalt Binder

Different types of modifiers have been investigated to improve aging characteristics of asphalt binders. In this research, the effect of zinc stearate modification has been studied on aging resistance of asphalt binder. For this purpose, viscous flow properties and other rheological characteristics of neat and modified asphalt binders have been evaluated by using conventional experimental tests and superpave protocol test. In order to evaluate rheological behavior of asphalt binder in presence of zinc stearate, a neat asphalt binder sample with three modified samples containing 0.5, 1 and 2 wt% of zinc stearate were aged by means of the Rolling Thin Film Oven Test (RTFOT). The Brookfield rotational viscosity (RV) was implemented at six different temperatures from 100 to 200 degree of centigrade. Furthermore, the dynamic shear rheometer (DSR) was used for evaluating complex modulus (G*) and phase angle (δ) of all neat and modified samples at 10, 20, 30, 40, 50 and 60°C in frequency sweep mode. To evaluate effect of adding zinc stearate by using viscosity results, proportion of asphalt binder’s viscosity after aging to its viscosity before aging was defined as viscosity aging index (VAI). Results showed that adding zinc stearate to neat asphalt binder reduces the viscosity aging index. Results of frequency sweep test indicated that zinc stearate causes the values of complex shear modulus in aging asphalt binder approach to neat state which means the effect of zinc stearate modification is positive for improving aging resistance of asphalt binder.

Investigation of the effect of Mg-Al-LDH on pavement performance and aging resistance of styrene-butadiene-styrene modified asphalt

Layered double hydroxide (LDH) could improve the aging resistance of an asphalt binder. However, the previous work all arbitrarily selected only one dosage of LDH such as 3% or 5%, which could not be enough to know the effect of LDH and its dosage on the pavement performance and aging resistance of an asphalt binder accurately, it is important to investigate the LDH effect on the properties of asphalt from more widely ranges of dosages. Meanwhile, the LDH and asphalt binder interaction is still unclear. In this paper, six dosages (from 2% to 7%) of Mg-Al-CO32−-LDH were conducted to modify the styrene-butadienestyrene modified asphalt (SBS MA). The Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (XRD) results indicate that there is no chemical reaction between LDH and SBS MA, the blending of LDH and SBS MA is a physical way. The rheological properties of SBS MA are studied by both dynamic shear rheometer (DSR) and bending beams rheometer (BBR), the results show that LDH can improve the high temperature performance of SBS MA, and does not significantly weaken other properties of SBS MA by controlling LDH dosage to be lower than 4%. The FTIR, complex modulus and VAI results show that LDH can significantly improve both the thermal oxide aging and UV aging resistances of SBS MA. LDH dosage of 4% is suggested to be the optimal dosage after considering the effect of LDH on the aging resistance and pavement performance of asphalt binder.

Evaluation of aging behaviors of asphalt binders through different rheological indices

The performance of asphalt pavement is seriously affected by aging of asphalt binder, so indices are expected which can not only evaluate aging resistance of asphalt binder but also indicate asphalt mixture performance. The objective of this paper was just to investigate effects of different rheological indices which present tighter and clearer correlation with asphalt mixture performance in evaluating asphalt binder aging behaviors, these indices including complex modulus (G∗) and phase angle (δ) master curves, rutting factor (G∗/sinδ), zero shear viscosity (ZSV), non-recoverable compliance (Jnr), fatigue factor (G∗·sinδ) and DSR function (DSRFn). Thin film oven test (TFOT), pressure aging vessel (PAV) test and ultraviolet (UV) irradiation were applied to simulate short-term, long-term thermal oxidation and photo oxidation aging, respectively. Frequency sweep tests and multiple stress creep recovery (MSCR) tests were conducted on three asphalt binders (60/80 pen grade base asphalt, styrene–butadiene-styrenecopolymer (SBS) modified asphalt and styrene butadiene rubber (SBR) modified asphalt) at different aging conditions. Meanwhile, aging sensitivities shown by different rheological indices were compared. The relationships between rheological indices were also discussed. The results showed that the ranking of aging resistances among asphalt binders evaluated by different rheological indices were nearly consistent and SBS modified asphalt exhibited the best aging resistance to three aging methods. Jnr and δ tended to decrease with the growth of aging severity, whereas other rheological indices were just contrary to this trend. Moreover, DSRFn proved to be the most sensitive index to aging. Based on correlation analyses, three groups of indices exhibited a strong correlation to each other, namely DSRFn versus G∗/sinδ, Jnr (0.1 kPa) versus Jnr (3.2 kPa) and Jnr (0.1 kPa) versus ZSV.

Application of Bio-Modified Montmorillonite Clay to Enhance Asphalt Oxidation Resistance

This study evaluates the effectiveness of using a Bio-modified Nanoclay additive (BNC) to reduce the oxidative aging of asphalt pavements. The study results through X-Ray Diffraction analysis showed that the modification of montmorillonite clay with bio-modifier increased the basal d-spacing of clay. The resulting nanoclay with increased interlayer spacing was chosen for application in asphalt binder. Rheological characterization of clay-modified asphalt binder were studied before and after oxidation aging. The effects of BNC on asphalt complex modulus were observed to be prevailing in the intermediate to high-temperature range. The aging resistance of asphalt binder showed improvement with the addition of nanoclay and the improvement was more notable in presence of bio modified-nanoclay than pure clay.

Rheological properties and anti-aging performance of asphalt binder modified with wood lignin

This study evaluated the potential use of wood lignin as partial substitute and performance modifier in asphalt binder. The rolling thin film oven (RTFO) and pressure aging vessel (PAV) methods were performed on asphalt samples to simulate different aging conditions. The Rotational Viscosity (RV), Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests were utilized to explore the influence of adding lignin on the rheological properties of asphalt binder. The Fourier Transform Infrared Spectroscopy (FTIR) was used to evaluate the anti-aging performance of lignin on asphalt binder. The rutting resistance of lignin modified asphalt binder at the high temperature was evaluated using Multi Stress Creep and Recovery (MSCR) test, while the fatigue life of asphalt binder was characterized using Linear Amplitude Sweep (LAS) test. The viscosity test results showed that the addition of wood lignin into asphalt binder caused stiffening effect. The DSR and BBR test results implied that adding lignin positively affected high-temperature rutting performance without adversely influencing low-temperature. The MSCR results indicated that the lignin improved the elastic recovery and reduced non-recoverable deformation of asphalt binder. The FTIR results indicates that the presence of lignin can help resist the formation of carbonyl structure in the aging process, and thus improved aging resistance of asphalt binder. The LAS test results showed that fatigue resistance of asphalt was negatively affected by lignin. The study results suggest that wood lignin is a promising modifier for asphalt materials with economic savings and environmental benefits.

Physiochemical, Rheological, and Oxidative Aging Characteristics of Asphalt Binder in the Presence of Mesoporous Silica Nanoparticles

Physiochemical and rheological properties of asphalt binder are known to directly relate to asphalt pavement performance as it relates to fatigue and low temperature cracking. While other performance criteria such as rutting is also affected by binder properties, the latter is known to be also very sensitive to aggregate skeleton and mixture gradation. To enhance pavement performance, asphalt industry has commonly used various modifiers to improve binder rheological properties both before and after it is exposed to oxidative aging. Among those additives are polymers, ground tire rubber, as well as several organic and inorganic fillers. Inorganic fillers such as nano-clay and silica fume showed to be promising candidates to enhance asphalt rheology and aging behavior. Such enhancements are typically attributed to the presence of silicate platelet and silica particles. Accordingly, this paper investigates the merits of application of mesoporous silica nanoparticles in this paper referred to as nano-silica as an asphalt binder additive to enhance binder rheological properties and oxidative aging resistance. To do so, different percentages of nano-silica were added to neat asphalt binder. Asphalt binder was then exposed to short-term oxidative aging using a rolling thin film oven (RTFO). To study the distribution of nano-silica in binder as well as the change in the chemical, rheological, and morphological properties of asphalt binders due to the addition of nano-silica, the scanning electron microscopy (SEM), Superpave tests, and Fourier transform infrared spectroscopy (FTIR) were conducted. It was found that introduction of nano-silica to asphalt binder can improve the rheological properties and oxidative aging resistance of asphalt binder.