Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction

Kim, Y. Richard; Castorena, Cassie; Elwardany, Michael D.; Rad, Farhad Yousefi; Underwood, B. Shane; Gundha, Akshay; Gudipudi, Padmini; Farrar, Mike; Glaser, R.

doi:10.17226/24959

Cited by 87 publications

(88 citation statements)

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“…In addition, binders were extracted and recovered at various depths from a select group of field cores obtained from in-service pavements. The AIPs of the field-aged binders were measured and compared with laboratory-aged oxidation rates to determine the laboratory aging durations that matched the target field AIPs for specific projects (11,12). The AIP measurements that were taken from binders extracted and recovered from laboratory-aged loose mixtures were also used to develop and verify the rigorous rheology-based oxidation kinetics model given in Equations 1 through 3 (11,12).…”

Section: Background Of Development Of Original Caimentioning

confidence: 99%

“…The AIPs of the field-aged binders were measured and compared with laboratory-aged oxidation rates to determine the laboratory aging durations that matched the target field AIPs for specific projects (11,12). The AIP measurements that were taken from binders extracted and recovered from laboratory-aged loose mixtures were also used to develop and verify the rigorous rheology-based oxidation kinetics model given in Equations 1 through 3 (11,12). This kinetics model was adapted from the model proposed by Glaser et al by using the logarithm of the dynamic shear modulus, log G*, at 64°C and 10 rad/s as an AIP rather than carbonyl plus sulfoxide absorbance peaks (16).…”

Section: Background Of Development Of Original Caimentioning

confidence: 99%

“…where t oven is the oven-aging duration at 95°C that is required to reflect field aging (days), CAI is the climatic aging index (days), R is the universal gas constant, or ideal gas constant (kJ/mol K), A is a fitting parameter (days), E a is the fitting parameter (kJ/mol), D is the depth correction factor, and T i is the pavement temperature obtained from the EICM at the depth of interest at the hour of interest, i (K). Temperatures below 20°C are excluded from the CAI calculations because prolonged aging at temperatures below 20°C does not lead to a significant increase in log G* at 64°C and 10 rad/s (12). In the study by Kim et al, the project-specific aging durations that were determined based on a comparison between laboratory loose mixture aging and field core log G*, at 64°C and 10 rad/s measurements, were used to calibrate the E a and A parameters in Equation 4and produce a CAI value that is equivalent to the time required to age an asphalt mixture in an oven at 95°C to match the in-service aging at a depth 6 mm below the pavement surface and for any given exposure time.…”

Section: Background Of Development Of Original Caimentioning

confidence: 99%

“…Then, the D values were calibrated using data that correspond to depths of 20 mm and deeper (12). A power law, given in Equation 5, was used to represent the relationship between D and depth (11).…”

Section: Background Of Development Of Original Caimentioning

confidence: 99%

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Refinement of Climate-, Depth-, and Time-Based Laboratory Aging Procedure for Asphalt Mixtures

Braswell¹,

Saleh

Elwardany

et al. 2020

Transportation Research Record: Journal of the Transportation R

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This paper refines the oxidation kinetics-based approach originally proposed in the NCHRP 09-54 project to determine the laboratory aging durations at 95°C that best reflect the effects of time, climate, and depth on loose asphalt mixtures. Aging durations that match the field aging at various pavement depths were determined in this study for asphalt mixtures, including warm-mix asphalt (WMA), polymer-modified asphalt (PMA), and reclaimed asphalt pavement (RAP). Here, the laboratory aging durations were used to calibrate a climatic aging index to prescribe the laboratory aging duration, given hourly pavement temperature history obtained from Enhanced Integrated Climatic Model analysis of the Modern Era Retrospective-Analysis for Research and Applications, Version 2 weather data. The recalibrated procedure determines the required laboratory aging durations with reasonable accuracy for virgin hot-mix asphalt (HMA) and WMA mixtures. From the recalibrated results, no variations were found with regard to the laboratory aging durations for WMA materials compared with HMA materials, but there were differences between the RAP and non-RAP mixtures. In some instances, the short-term aged RAP mixtures that were prepared according to AASHTO R 30 exceeded the aging level of 4-year-old field cores, suggesting that refinement of this standard short-term aging procedure may be necessary. Approximately half of the PMA sections evaluated exhibited outlier behavior that could have been caused by the unrealistically harsh thermal history of the field projects from which the cores were acquired.

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Section: Background Of Development Of Original Caimentioning

confidence: 99%

Section: Background Of Development Of Original Caimentioning

confidence: 99%

Section: Background Of Development Of Original Caimentioning

confidence: 99%

Section: Background Of Development Of Original Caimentioning

confidence: 99%

See 2 more Smart Citations

Refinement of Climate-, Depth-, and Time-Based Laboratory Aging Procedure for Asphalt Mixtures

Braswell¹,

Saleh

Elwardany

et al. 2020

Transportation Research Record: Journal of the Transportation R

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“…Therefore, 4 hours at 135°C as short term aging condition and 9 days at 85°C as long term aging condition was recommended to simulate aging process. Kim et al [29] made research depending on the NCHRP project 09-54. In order to simulate long term aging of asphalt mixtures, a procedure was developed, calibrated and validated with field mixtures obtained from nine field projects which represent the wide variety of climates found in the United States and Canada.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Different Laboratory Aging Methods of Bituminous Mixtures

Durmaz

Şengöz

Özdemir

et al. 2021

Period. Polytech. Civil Eng.

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The predicted performance and service life of the pavement depend largely on the properties of bitumen used in the mixtures. The most important feature of bitumen, which has profound effect on the performance of the road is durability. The durability of bitumen is expressed as the resistance to aging. In this study, the bituminous mixture aging was performed instead of bitumen aging in order to represent the aging in the field in the best possible way. The aim of this paper is to evaluate different proposed laboratory aging methods (NCHRP 09-52, NCHRP 09-54 and RILEM) in relation with the current Standard AASHTO R30 (Standard Practice For Mixture Conditioning of Hot Mix Asphalt standard) and to make comparison with the samples performance taken from the field in terms of Indirect Tensile Strength (ITS). The level of aging has also been compared with the samples taken from recently constructed pavement surface and from the five years old pavement surface. Results depicted that, laboratory aging methods revealed the field aging properties on the unaged bitumen. Based on the results, 2 hours forced draft oven aging at 135°C is recommended as short term aging condition because, 2 hours or 4 hours short term forced draft oven aging did not yield significant variation in terms of ITS values. Additionally, 120 hours (5 days) oven aging of compacted samples at 85°C can be recommended as long term aging condition.

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