Investigation of the aging behaviors of reclaimed asphalt

Xu, Shidong; Wu, Hao; Song, Weimin; Zhan, Yiqun

doi:10.1016/j.jclepro.2022.131837

Cited by 22 publications

(5 citation statements)

References 35 publications

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“…Based on the specification of AASHTO R 92-18 [31] and some references [12,32], the curve of R versus Jnr could be used to identify the elastic characteristic of the binder. If the results of R3.2 versus Jnr3.2 fall above the curve, the binder is considered to have a significant elastic response for the associated value of creep, indicating that the binder has been successfully enhanced and its elastic characteristic has been improved.…”

Section: Creep Recovery Capacitymentioning

confidence: 99%

“…Many studies have found that the addition of RAP could increase the water sensitivity of recycled mixtures [9]. The aged binder in RAP with high stiffness exhibits a relatively high cracking potential, which made it easier for water to penetrate into the mixtures containing RAP and deteriorate the cohesion of the asphalt binder and its adhesion to aggregates [10][11][12]. However, some research has suggested that the moisture-damage resistance of mixtures could be enhanced to some extent with the incorporation of RAP due to the increased adhesive strength of the aged binder [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

Zhan

et al. 2022

Coatings

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In recycled asphalt mixtures, the RAP binder often becomes stiff and brittle due to aging, making it difficult to achieve a complete integration with the added virgin binder, which could provide a negative impact on the long-term performance of the recycled asphalt mixtures. In an attempt to identify the influence of the integration degree on the adhesion characteristics of virgin-aged composite binder and the corresponding binder-aggregate system, a series of experiments, including the modified boiling test and pull-off test and corresponding formation methods for the binder samples with various interfusion states, were designed and carried out in the present study. The two-layered composite binder (CB), consisting of a layer of virgin binder and a layer of aged binder was fabricated for the experiments, and the testing results were analyzed and compared with those of the virgin binder (VB), the aged binder (AB), and the blended binder (BB). The thermostatic treatments with various durations were subjected to the binder samples to attribute them with various integrations, and the wetting conditioning was also imposed on them to introduce the impact of moisture erosions. The rheological properties, creep recovery capacity, and fatigue resistance of the binders were first investigated based on a dynamic shear rheometer. The adhesion characteristics and failure behaviors of the binder-aggregate system were furthermore explored with the modified boiling test and pull-off test, and the percentage of residual binder (%_residual binder), pull-off test strength (POTS), and moisture damage index (MDI) were adopted to assess or quantify their adhesion characteristics and moisture susceptibility. The results found that the rheological properties and creep recovery capacity of the CB were similar to those of the VB, and its fatigue life exhibited an increasing trend with the extension of the thermostatic-treatment duration. In contrast to the modified boiling test, the pull-off test was more effective at evaluating the integration and distinguishing the failure behaviors of the binder-aggregate system. As the thermostatic-treatment duration prolonged, the interfusion between the virgin and the aged binder was facilitated, the cohesion within the binder and the adhesion between the binder and the aggregate was also enhanced, and thus the adhesion performance and moisture-damage resistance of the system were improved.

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Section: Creep Recovery Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

Zhan

et al. 2022

Coatings

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“…Therefore, the application of SAP in asphalt pavements could endow the material with crack sealing and filling ability and prevent the continuous water migration along the crack openings. Moisture induced damages, including the pumping and adhesion failure at the binder-aggregate interface, are considered as major contributors to the deteriorations of the durability of asphalt pavements [ 26 , 27 , 28 , 29 ]. Moreover, under freeze-thaw attacks, the water trapped in the cracks and pores would produce considerable frost pressures, which could further aggravate the deterioration of asphalt concrete.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Performances and Functions of Asphalt Mixtures Modified with Super Absorbent Polymer (SAP)

Sun

Song

et al. 2023

Materials

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The super absorbent polymer (SAP) has been attracting extensive concerns due to its strong capacity in water absorption and retention. The amorphous hydrogels formed by the post-absorbent SAP have the potential of clogging the micro-cracks in asphalt materials and refraining the rainwater from infiltrating. This provides the possibility of applying SAP in asphalt pavements to seal or fill the cracks and relieve the distresses caused by rainwater infiltration in the underlying layers. Before exploring the cracking sealing mechanism of SAPs in asphalt pavements, a series of experiments were performed to evaluate the feasibility and influences of SAPs in asphalt mastics and asphalt mixtures on their mechanical performances and functionalities. Firstly, the basic properties of SAPs were analyzed, and then the rheological properties of the asphalt mastics using SAP replacing mineral powder (10%, 20%, 30%, and 40% by volume) were explored. The water stability and infiltration reduction effect of the asphalt mixtures incorporated with SAP were evaluated by the Marshall stability test, immersion Marshall stability test, freeze-thaw splitting strength test, Cantabro test, and permeability test. The test results indicated that SAPs could be used in the asphalt mixtures to partially substitute mineral powder with desirable mechanical performances. When less than 10% of the mineral powder was replaced by the SAP, the high-temperature performance and fatigue life of the asphalt mastics could be improved to some extent, but both declined after the content of the SAP was larger than 10%. Due to the hydrogels formed by SAPs after water absorption, the water stability of the asphalt mixtures deteriorated with the increased content of SAPs. Moreover, the results from the permeability tests implied that the SAP hydrogels could fill the seepage channels in the material, thus improving the migration and infiltration resistances of the asphalt mixtures. With the increased contents of SAPs, the permeability coefficients of the asphalt mixtures could be reduced up to 55%. Based on the research findings in this study, when an appropriate amount of SAP was added in the asphalt materials, desirable temperature stability, water stability, and fatigue resistance could be achieved regarding actual requirements from applications. At the same time, the addition of SAPs could effectively refrain the infiltration and migration of rainwater in asphalt pavements, thus potentially mitigating the effect of water erosion on the underlying layers.

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“…Most studies have focused on analysing the influence of temperature, oxygen pressure, or a combination of both parameters to correlate with field performance. Among the ageing techniques, the most widely used laboratory protocol is the asphalt binder ageing, which utilises a rolling thin film oven (RTFO) and a pressure ageing vessel (PAV) to simulate the short-term and long-term ageing mechanisms of asphalt binders, respectively [15,16]. These techniques are often employed in the Superpave performance grading system and serve as valuable tools for comparing and establishing benchmarks for various binders.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Ageing Sensitivity of the Asphalt Binder via Distinct Ageing Methods

Vijayan,

Mantalovas,

Acuto

et al. 2023

Infrastructures

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Asphalt binder is a crucial component of asphalt pavements that undergoes ageing over time, which can result in the reduced performance and deterioration of pavements. Consequently, artificial ageing methods play a significant role in providing valuable insights into the ageing behaviour and long-term performance of asphalt binders. However, a consensus on the most effective method for simulating ageing behaviour remains elusive, leading to disparities in the outcomes across different research studies. To address this issue, the study utilises two thermo-oxidative ageing approaches, one focusing on the binder itself and another on the loose asphalt mixture. The study investigates the effect of these ageing methods on the behaviour of asphalt binder using physical, rheological, and chemical characterisation. For the binder ageing method, a rolling thin film oven (RTFO) and a pressure ageing vessel (PAV) were utilised, whereas the loose asphalt mixture ageing was performed in an oven at 95 °C for various durations. The results indicated that the ageing trend differed between the two oxidative ageing approaches as the ageing duration increased. However, by employing an ageing sensitivity index, comparable rheological properties were observed between the binders aged using the PAV for 20 h and the loose asphalt mixture for 5 days. The Fourier Transform Infrared (FTIR) spectroscopy analysis revealed that the ageing methods influenced the functional groups associated with ageing in distinct ways, even though they exhibited similar rheological behaviour. Overall, this study provides a comprehensive understanding of different thermo-oxidative ageing approaches, their correlation, and their relevance to the studied field-aged binders.

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Investigation of the aging behaviors of reclaimed asphalt

Cited by 22 publications

References 35 publications

Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

Investigation on Adhesion Characteristics of Virgin-Aged Composite Binder and Binder-Aggregate System

Investigation on Performances and Functions of Asphalt Mixtures Modified with Super Absorbent Polymer (SAP)

Evaluating the Ageing Sensitivity of the Asphalt Binder via Distinct Ageing Methods

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