Evaluating the Effects of Using Recycled Asphalt Pavements on Fatigue Properties of Warm Mix Asphalt

Nejad, Fereidoon Moghadas; Abandansari, Hossein Fallahi

doi:10.3311/ppci.8320

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…The RA 70/100 mixtures have the lower

value but the highest

and

curvature. This fact indicates that, in the cases of the mixtures containing reclaimed asphalt, a higher stiffness can be expected at higher temperatures [ 37 ]. In summary, it can be stated that the

parameter can relate to the stiffness of the asphalt mixture, including the influence of the stone skeleton and the binder.…”

Section: Evaluation Of Resultsmentioning

confidence: 99%

Use of the Modified Ramberg-Osgood Material Model to Predict Dynamic Modulus Master Curves of Asphalt Mixtures

Primusz

Tóth

2023

Materials

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Dynamic modulus master curves are usually constructed by using sigmoid functions, but the coefficients of these functions are not independent of each other. For this reason, it is not possible to clearly identify their physical mean. Another way of describing the dynamic modulus master curves is to choose the Ramberg-Osgood (RAMBO) material model, which is also well-suited for modelling the cyclic behaviour of soils. The Ramberg-Osgood model coefficients are completely independent of each other, so the evaluation of the fitted curve is simple and straightforward. This paper deals with the application of the Ramberg-Osgood material model compared to the usual techniques for constructing a master curve, determining the accuracy in describing the material behaviour of asphalt mixtures, and seeking any surplus information that cannot be derived by traditional techniques. Because the dynamic modulus and phase angle master curves are strictly related, in the present study, the asymmetric bell-shaped frequency curve of Toranzos was used to describe the phase angle for four types of asphalt mixtures (RmB, PmB, RA, and NB). The results show that the RAMBO model is a good alternative to the sigmoid function in describing the master curve of the dynamic modulus. We successfully used the Toranzos asymmetric bell-shaped frequency curve to describe the phase angle master curve. We also found a promising relationship between the independent RAMBO model parameters and the physical properties of the investigated binders, but this requires further research.

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“…The RA 70/100 mixtures have the lower

value but the highest

and

curvature. This fact indicates that, in the cases of the mixtures containing reclaimed asphalt, a higher stiffness can be expected at higher temperatures [ 37 ]. In summary, it can be stated that the

parameter can relate to the stiffness of the asphalt mixture, including the influence of the stone skeleton and the binder.…”

Section: Evaluation Of Resultsmentioning

confidence: 99%

Use of the Modified Ramberg-Osgood Material Model to Predict Dynamic Modulus Master Curves of Asphalt Mixtures

Primusz

Tóth

2023

Materials

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Study on the relationship between fatigue life and rheology of rejuvenated asphalt

Zhou¹,

Zhang²

2022

Vib. proced.

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The utilization of reclaimed asphalt pavement (RAP) contributes significantly to reducing resource waste and protecting the environment. However, due to the performance of rejuvenator, fatigue cracking has always been one of the important constraint on the development of the reclaimed asphalt pavements. Based on the studies previously conducted by our group, this paper investigated the fatigue properties of waste rubber/oil (WRO) rejuvenated asphalt and common rejuvenated asphalt by dynamic shear rheometer test (DSR), and analyzed the relationship between fatigue life and rheological properties of rejuvenated asphalt. The results indicated that the fatigue life of WRO rejuvenated asphalt is comparatively better than that of common rejuvenated asphalt. Affected by the of waste tire crumb rubber (WTCR), the increase of the proportion of waste tire crumb rubber (WTCR) can improve the elastic recovery ability of rejuvenated asphalt. The fatigue life of rejuvenated asphalt is susceptible to the rate of phase angle change, and the lower the viscoelasticity change rate, the better the fatigue life. There is no obvious direct relationship between the fatigue life of rejuvenated asphalt and the complex modulus.

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Investigating the Effect of Hydrophobic Additives in Moisture Damage Reduction of Asphalt Mixtures

Hamedi

Shabani

Safargar

2020

Period. Polytech. Civil Eng.

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In order to increase the life of the asphalt mixture and reduce the cost of the pavement life cycle, methods must be provided to improve the quality. Accordingly, the effects of aggregate surface coating with hydrophobic material in order to modify the aggregate mixture’s polar properties and reduce its hydrophilic properties are investigated. To this end, limestone and granite aggregates, 60-70 bitumen, and Two types of additives were used as the primary materials for the construction of asphalt mixtures. Thermodynamic concepts with cyclic loading have been used to evaluate the effects of these additives. The results obtained in this study indicate that the hydrophobic coating on the aggregate surface has increased the acidic components and decreased the alkaline components of the surface free energy for both types of aggregates. These changes will increase the bitumen-aggregate adhesion and make a better coating of bitumen on the aggregate surface. The results based on thermodynamic concepts suggest that the aggregate surface coating has reduced the system’s separation energy and the desire for stripping. The results of the dynamic modulus in wet to dry conditions also approve this outcome. The combination of thermodynamic concepts and the cyclic loading results show that the coating on the aggregate surface has reduced the aggregate’s stripping from bitumen. It is also obvious that the samples made with granite aggregates, which have acidic properties, are prone to moisture damage and have a higher tendency to strip.

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Evaluating the Effects of Using Recycled Asphalt Pavements on Fatigue Properties of Warm Mix Asphalt

Abstract: Abstract

Cited by 3 publications

References 8 publications

Use of the Modified Ramberg-Osgood Material Model to Predict Dynamic Modulus Master Curves of Asphalt Mixtures

Use of the Modified Ramberg-Osgood Material Model to Predict Dynamic Modulus Master Curves of Asphalt Mixtures

Study on the relationship between fatigue life and rheology of rejuvenated asphalt

Investigating the Effect of Hydrophobic Additives in Moisture Damage Reduction of Asphalt Mixtures

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