The effect of long-term aging on fatigue cracking resistance of asphalt mixtures

Sreedhar, Shashwath; Coleri, Erdem

doi:10.1080/10298436.2020.1745206

Cited by 38 publications

(10 citation statements)

References 9 publications

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“…After mixing, the loose mixtures were conditioned in the oven for 2 h at 135 °C based on the findings of previous research studies [ 11 , 27 ] to simulate short-term aging (STA). These short-term-aged loose mixtures were further conditioned at 95 °C for 24 h to simulate long-term aging (LTA) according to the LTA protocol for the Oregon mixtures [ 11 , 28 ]. Only the Semi-Circular Bend (SCB) test samples were subjected to LTA conditioning.…”

Section: Methodsmentioning

confidence: 99%

“…Prior to mixing, the aggregates and the binder were heated separately in the oven for 2 h. The binder was heated at the mixing temperature (173 • C), virgin aggregates were heated at 10 • C higher than the mixing temperature, and RAP was heated at 110 • C. After mixing, the loose mixtures were conditioned in the oven for 2 h at 135 • C based on the findings of previous research studies [11,27] to simulate short-term aging (STA). These short-term-aged loose mixtures were further conditioned at 95 • C for 24 h to simulate long-term aging (LTA) according to the LTA protocol for the Oregon mixtures [11,28]. Only the Semi-Circular Bend (SCB) test samples were subjected to LTA conditioning.…”

Section: Preparation Of Laboratory Mixed-laboratory Compacted (Lmlc) ...mentioning

confidence: 99%

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Selection of Durable, Environmentally Friendly, and Cost-Effective Asphalt Mixtures

et al. 2022

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In recent years, due to the advent of several additives and innovations, asphalt mix design has become more complex. The mixes meeting the volumetric mix design requirements may still fail prematurely in the field. Thus, a transition from a simplistic volumetric-based mix design to a performance-based mix design is required, which was also envisioned in the Strategic Highway Research Program (SHRP) and Superpave mix design. In addition to performance verification, asphalt mix designs should also be evaluated for the life-cycle costs and environmental impact to encourage durable as well as sustainable and cost-effective alternatives. In this study, three asphalt mixtures with different reclaimed asphalt pavement (RAP) contents and additives were evaluated for cracking and rutting performance by using different performance thresholds for asphalt mixtures that are generally used in the construction of high-volume roads in Oregon. A balanced mix design process was followed to determine the required binder content for the three mixtures. Based on the life cycle cost and environmental impact analyses, the mixture with warm mix additive (WMA) was selected as the most economically and environmentally viable asphalt mixture to be used for construction in Oregon.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Laboratory Mixed-laboratory Compacted (Lmlc) ...mentioning

confidence: 99%

Selection of Durable, Environmentally Friendly, and Cost-Effective Asphalt Mixtures

et al. 2022

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“…However, based on the suggestions from NCHRP 815, a short-term conditioning period of 2 h at 135°C was adopted ( 18 ). As a part of ODOT research project SPR801, a long-term aging (LTA) protocol was also developed for the mixtures used in Oregon ( 19 ). Based on the recommendations, the loose mixtures were further aged at 95°C for 24 h to simulate LTA.…”

Section: Materials and Sample Fabricationmentioning

confidence: 99%

“…Since production mixtures were already exposed to STA during plant mixing and silo storage, short-term conditioning in the laboratory was not performed. For the cracking experiments, the loose mixtures were further subjected to LTA of 24 h at 95°C ( 19 ). After the long-term conditioning, the mixtures were again kept in the oven at the compaction temperature for two more hours before compaction.…”

Section: Materials and Sample Fabricationmentioning

confidence: 99%

Development of a Balanced Mix Design Method in Oregon to Improve Long-Term Pavement Performance

Sreedhar

Coleri

Obaid

et al. 2021

Transportation Research Record: Journal of the Transportation R

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Most state Departments of Transportation (DOTs) and asphalt contractors do not think that commonly used asphalt mixture properties, such as voids in mineral aggregate (VMA), voids filled with asphalt (VFA), and dust-to-binder ratio, reflect the long-term performance of asphalt mixtures. In addition, there are several new additives, polymers, rubbers, and high-quality binder types incorporated into asphalt mixtures today. Volumetric mixture design methods are not capable of capturing the benefits of using all these new technologies on asphalt mixture performance. Furthermore, the interaction of virgin binders with reclaimed asphalt pavement (RAP) mixtures with high binder replacement contents and the level of RAP binder blending into the asphalt mixture are still not well understood. Because of all these complications related to the more complex structure of asphalt mixtures, simple volumetric evaluations to determine the optimum binder content may not result in reliable asphalt mixture designs. Two volumetrically identical mixtures may provide completely different rutting and cracking performance according to laboratory tests. For all these reasons, in this study performance tests for rutting and cracking are incorporated into current asphalt mixture design methods to make it possible to validate or revise the optimum binder content determined by the volumetric mix design method (the only method currently used for asphalt mix design).

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“…The reason is ascribed to the ageing of RAP as a result of exposure to the atmosphere throughout its lifespan. The aromatic compounds in asphalt binders become oxidised and more polar carbonyl compounds are created; thus increasing both elastic modulus and viscosity, as well as stiffening the binder [11]. The fractions of saturates, aromatics, resins, and asphaltenes (SARA) are modified when aromatics decrease and asphaltenes increase over time [12].…”

Section: Introductionmentioning

confidence: 99%

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

et al. 2021

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Reclaimed asphalt pavement (RAP) has received much attention recently due to its increased use in hot mix asphalt (HMA) pavements to enhance pavement sustainability. The use of aged asphalt in RAP, which is highly oxidised and has lost its properties due to exposure to traffic loads and climatic conditions throughout its lifespan, can cause asphalt mixtures to stiffen and embrittle, thus negatively affecting the behaviour of asphalt mixtures. This issue may be resolved by including rejuvenating agents that can restore both physical and rheological properties of aged asphalt by increasing maltene fractions and decreasing asphaltene. However, the high restoration capacity of any kind of rejuvenating agent does not assure the durability of restored aged asphalt. This study explored the performance and durability of rejuvenated asphalt mixtures embedded with several types of rejuvenators identified from the extensive literature review. The study serves as a significant reference to predict future challenges in rejuvenating aged asphalt.

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The effect of long-term aging on fatigue cracking resistance of asphalt mixtures

Cited by 38 publications

References 9 publications

Selection of Durable, Environmentally Friendly, and Cost-Effective Asphalt Mixtures

Selection of Durable, Environmentally Friendly, and Cost-Effective Asphalt Mixtures

Development of a Balanced Mix Design Method in Oregon to Improve Long-Term Pavement Performance

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

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