Influence of mix design parameters on asphalt concrete aging rate using I-FIT specimens

Zhu, Zehui; Singhvi, Punit; Espinoza-Luque, Arturo F.; Özer, Hasan; Al‐Qadi, Imad L.

doi:10.1016/j.conbuildmat.2018.12.099

Cited by 20 publications

(8 citation statements)

References 11 publications

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“…It is observ the mix that underwent the least CL changes was HMA-25, while the greates occurred in HMA-10. This was perhaps due to the greater content of asphalt bi aged in HMA-10, which became brittle and was more easily detached under abra Normally, mixes that present greater AV, greater particle sizes, coarse gr and lower VFA are more susceptible to aging [8,40,74,[78][79][80]. Generally, this con based on the way it changes in stiffness (mainly in RM tests) of aged mixes wit to the control mix.…”

Section: Cantabro Testmentioning

confidence: 99%

“…When two mixes appear in a box that they underwent similar changes-in other words, changes that are not st significant based on ANOVA analysis. Normally, mixes that present greater AV, greater particle sizes, coarse gradations, and lower VFA are more susceptible to aging [8,40,74,[78][79][80]. Generally, this conclusion is based on the way it changes in stiffness (mainly in RM tests) of aged mixes with relation to the control mix.…”

Section: Cantabro Testmentioning

confidence: 99%

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Influence of Gradation on the Mechanical Properties of Aged Hot-Mix Asphalts

2021

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When a hot-mix asphalt (HMA) ages, its mechanical properties, resistance, and durability change. Several studies have been conducted throughout the world to evaluate the effects of aging in HMAs. However, few studies have analyzed the influence of gradation. The main objective of this study was to evaluate the influence of gradation on the mechanical properties of aged HMA mixes. For such purposes, three HMA mixes with different gradations were manufactured (named HMA-10, HMA-19, and HMA-25), which were conditioned in STOA (short-term oven aging) and LTOA (long-term oven aging) by following the guidelines established by the AASHTO R30 specification. Marshall, Indirect Tensile Strength (ITS), resilient modulus, permanent deformation, fatigue (under controlled-stress condition), and Cantabro tests were performed. These tests were carried out to evaluate resistance under monotonic and cyclic load as well as the resistance to moisture damage and abrasion. The best performing mix in the test was HMA-19. There is no clear trend about the influence of gradation over the susceptibility of mixes for aging. This susceptibility changes depending on the test performed and the property measured. Furthermore, in resilient modulus tests, it is observed that the influence of gradation on aging susceptibility changes depending on the test temperature.

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Section: Cantabro Testmentioning

confidence: 99%

Section: Cantabro Testmentioning

confidence: 99%

Influence of Gradation on the Mechanical Properties of Aged Hot-Mix Asphalts

2021

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“…where G f is the fracture energy, defined as the area under the load-displacement curve divided by the ligament length and specimen thickness, J/m 2 ; m is the slope at the inflection point, kN/mm; and A is a scaling coefficient taken as 0.01. Aging rate, which measures the susceptibility of AC to aging, can be calculated using Equation 2 (5).…”

Section: Illinois Flexibility Index Testmentioning

confidence: 99%

“…Characterizing aged virgin binders may not be sufficient to give a full picture of the mixture performance, especially with high levels of asphalt binder replacement (ABR). In addition, varying mix designs and aggregate properties have been proven to have significant effects on AC susceptibility to aging ( 5 ). Thus, it is necessary to study the effect of aging on AC mixture.…”

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confidence: 99%

“…Owing to various crude oil origins and refinery processes, binders with the same grades showed significantly different rheological properties ( 15 , 16 ). Consequently, AC prepared using those binders may perform distinctly different ( 5 , 9 ). However, there is a gap in the literature, the systematic evaluation of the effect of the binder source on the long-term performance of AC.…”

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confidence: 99%

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Quantification of the Effect of Binder Source on Flexibility of Long-Term Aged Asphalt Concrete

Zhu

Singhvi

Ali

et al. 2020

Transportation Research Record: Journal of the Transportation R

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Asphalt concrete (AC) aging reduces the resistance of flexible pavements to fatigue, thermal, and block cracking. Therefore, it is critical to understand the effects of AC aging on flexible pavement serviceability. Binder source has a significant effect on AC long-term aging. Therefore, it is necessary to develop a reliable, practical, and systematic method to quantify the effect of binder source on AC cracking resistance. Seven laboratory mixes were designed and produced at three asphalt binder replacement (ABR) levels using various binders, but same binder performance grade (PG). The AC mixes were tested using the Illinois Flexibility Index Test (I-FIT) under unaged and long-term aged conditions. Standard Superpave tests and temperature-frequency sweep tests, were conducted on virgin binders under various aging conditions. By comparing the binder rheological parameters and flexibility index (FI) of long-term aged AC specimens, the [Formula: see text] and m-value after 40-h of aging using a pressure aging vessel (PAV) were identified as valid indicators to reflect the effects of the binder source on AC long-term flexibility. A minimum [Formula: see text] of -8°C and m-value of 0.280 were proposed as the preliminary thresholds. A new parameter, [Formula: see text], which is defined as the m-value of 20-h PAV-aged binder minus the m-value of a 40-h PAV-aged binder, correlates well with the aging rate of AC. A binder with a high [Formula: see text] may induce an excessive drop in flexibility after long-term aging.

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