Improving the Moisture Sensitivity of Asphalt Mixtures by Simultaneous Modification of Asphalt Binder and Aggregates with Carbon Nanofiber and Carbon Nanotube

Nikookar, Mohammad; Movahhed, Mojtaba Bagheri; Ayoubinejad, Jalal; Gilani, Vahid Najafi Moghaddam; Hosseinian, Seyed Mohsen

doi:10.1155/2021/6682856

Cited by 15 publications

(5 citation statements)

References 36 publications

(47 reference statements)

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“…The specimens were tested three times with a loading rate of 50 mm/ min at a temperature of 25°C and ITS (S t ) in kPa was determined by Equation ( 1), where P is the maximum load (N), t is the specimen thickness (mm), and D is the specimen diameter (mm). Also, the TSR is determined according to Equation ( 2), where S 1 and S 2 are ITS values for unconditioned and conditioned specimens (kPa), respectively [32][33][34].…”

Section: Experimental Programmentioning

confidence: 99%

Evaluation of Rutting, Fatigue, and Moisture Resistance of Low-Energy Asphalt Mixtures Modified by Crumb Rubber

Moghimi,

Shafabakhsh,

Divandari

2023

Advances in Civil Engineering

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Low-energy asphalt (LEA) mixture, as an alternative to hot mix asphalt (HMA) due to its lower mixing temperature, has advantages such as reducing energy consumption and environmental pollutants. LEA has poor performance characteristics due to the presence of water in its manufacturing process and low mixing temperature. All the studies about LEA have been focused only on investigating the performance of this asphalt mixture, and the effect of additives in its modification is one of the research gaps in this field. Therefore, the use of crumb rubber (CR) and determining its optimal percentage in modifying the performance characteristics of LEA is considered an innovation of this research. In this research, the performance characteristics of LEA modified by 10%, 15%, and 20% CR were evaluated. In order to examine the rutting behavior, moisture sensitivity and fatigue resistance, dynamic creep, indirect tensile strength (ITS), and four-point bending beam tests were applied, respectively. The results of creep curves and flow numbers (FNs) indicated that modifying LEA by 15% increased the rutting resistance by 1.92 and 2.3 times, respectively, compared to the HMA specimen at the stress level of 207 and 310 kPa. Moreover, the evaluation of the creep strain slope revealed that modifying LEA significantly reduced stress sensitivity. ITS test showed an increase in tensile strength ratio by 22% in the specimen with 10% CR compared to the unmodified specimen. In the evaluation of fatigue resistance, while LEA containing 10% CR had almost similar results to the HMA specimen, other specimens represented a shorter fatigue life, so that with the increase in CR percentage, the fatigue life decreased. Determination of fatigue life by energy ratio and Rowe and Bouldin criteria showed similar results. Finally, by determining the plateau value (PV) in the ratio of the dissipated energy change method, the lowest PV was assigned to the 10% CR-modified LEA and HMA specimens, respectively.

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Section: Experimental Programmentioning

confidence: 99%

Evaluation of Rutting, Fatigue, and Moisture Resistance of Low-Energy Asphalt Mixtures Modified by Crumb Rubber

Moghimi,

Shafabakhsh,

Divandari

2023

Advances in Civil Engineering

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“…Adhesion is the ability of asphalt to bind aggregates to produce good bonds in the mixture [16]. The binder between asphalt and aggregate needs to be modified to determine the quality of adhesion and take into account the composition of the material so that the moisture of the mixture is reduced [17]. The quality of the asphalt mixture can be in the form of workability and resistance to stress [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Properties Medium Grade Coconut Nano Modified Asphalt Based on Physical, SEM, and Contact Angle Tests

Sunarjono,

Sularsih,

Ngafwan

et al. 2024

E3S Web of Conf.

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Many road pavements have experienced a decline in quality, giving rise to the issue of nanotechnology materials in the construction sector which is expected to overcome this problem. Indonesia, which is the largest palm oil-producing country in the world, needs to utilize its waste, including for pavement materials. The research aims to examine adhesion, and characteristics of asphalt and mastics asphalt based on physical properties, SEM (Scanning Electron Microscope) and contact angles. Palm oil waste was processed into medium-Nano carbon material, then mixed with asphalt cement 60/70 at a temperature of 150ºC and stirred using a high-speed drill for 45 minutes until evenly mixed. The research results show that the carbon Nano material used has an average surface area of 115 nm2 which produces dominant elements of C atoms and S atoms. The low penetration value, high softening point and ductility prove that the ability to increase the strength, temperature resistance and cohesion of mastics asphalt is better than AC 60/70. Apart from that, the medium level of waste used can increase the adhesion of mastics asphalt. This can be seen from the contact angle obtained which is 125.830º which is smaller than using 60/70 asphalt which is 129.258º.

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“…Asphalt mixture performance can also be improved against various failures. Researchers have focused on the incorporation of high-quality materials, modifcation of asphalt binder and gradation of aggregates, the addition of proper fllers and additives, and also some methods of healing [4][5][6][7][8][9][10]. Additive incorporation has gained momentum in the past decades with respect to asphalt mixture type, mix design variables, and climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Cobalt Oxide on the Rheological Behavior of Asphalt Binder and Mechanical Characteristics of Hot Mix Asphalt

Hamedi

Pakenari

Tabrizi

et al. 2023

Advances in Civil Engineering

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In this study, the effects of nano-cobalt oxide (nano-CoO) (1 and 2% by asphalt binder weight) on the rheological behavior of the asphalt binder and mechanical characteristics of asphalt mixtures were examined. To evaluate the behavior of the asphalt binder at moderate and high temperatures, the dynamic shear rheometer (DSR) test was used. Besides, to study asphalt mixtures’ rutting potential and fatigue cracking, the repeated load axial (RLA) test and the indirect tensile fatigue test (ITFT) were conducted, respectively. Based on the rheological tests, adding 1 and 2% of nano-CoO to asphalt binder increases the complex modulus (G∗) and reduces the phase angle (δ) at high temperatures and significantly improves the modified asphalt binder’s rutting parameter. Also, at moderate temperatures, the addition of nano-CoO reduced the fatigue parameter of the modified asphalt binder compared to the control asphalt binder. It was demonstrated that the permanent strain of the modified specimens was decreased by about 35% compared to that of the control specimens. The fatigue tests at two temperatures and five stress levels also showed that incorporating nano-CoO significantly increased (about 90%) the fatigue life of modified samples compared to controlled samples.

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Improving the Moisture Sensitivity of Asphalt Mixtures by Simultaneous Modification of Asphalt Binder and Aggregates with Carbon Nanofiber and Carbon Nanotube

Cited by 15 publications

References 36 publications

Evaluation of Rutting, Fatigue, and Moisture Resistance of Low-Energy Asphalt Mixtures Modified by Crumb Rubber

Evaluation of Rutting, Fatigue, and Moisture Resistance of Low-Energy Asphalt Mixtures Modified by Crumb Rubber

Investigation of the Properties Medium Grade Coconut Nano Modified Asphalt Based on Physical, SEM, and Contact Angle Tests

Effect of Nano-Cobalt Oxide on the Rheological Behavior of Asphalt Binder and Mechanical Characteristics of Hot Mix Asphalt

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