Comprehensive evaluation of low-temperature fracture indices for asphalt mixtures

Zhu, Yuefeng; Dave, Eshan V.; Rahbar-Rastegar, Reyhaneh; Daniel, Jo Sias; Zofka, Adam

doi:10.1080/14680629.2017.1389085

Cited by 85 publications

(19 citation statements)

References 15 publications

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“…Generally, fracture energy (G f ), as one of the main fracture parameters, can be calculated from the area under the load-CMOD curve. However, it has been found by many researchers (Al-Qadi et al [32], Zhu et al [33], and Pérez-Jiménez et al [34]) that the fracture energy has its drawbacks and could not fully distinguish between the cracking behavior of the mixtures. It can be seen in Figure 4 that the mixture with high peak load (about 3.8 kN) and steep post-peak slope has very close fracture energy value with the mixture exhibiting low peak load (about 2.5 kN) and shallow post-peak slope.…”

Section: Low-temperature Fracture Testmentioning

confidence: 99%

“…[32], Zhu et al [33], and Pérez-Jiménez et al [34]) that the fracture energy has its drawbacks and could not fully distinguish between the cracking behavior of the mixtures. It can be seen in Figure 4 that the mixture with high peak load (about 3.8 kN) and steep post-peak slope has very close fracture energy value with the mixture exhibiting low peak load (about 2.5 kN) and shallow post-peak slope.…”

Section: Low-temperature Fracture Testmentioning

confidence: 99%

“…Therefore, different indices such as flexibility index (FI), toughness index (TI), and fracture strain tolerance (FST) are proposed to assess the low-temperature properties of asphalt mixtures. The FST fracture index was developed by Zhu et al [33] and showed superiority and lower variability than fracture energy in assessing the low temperature cracking ability of mixtures. The FST parameter can be calculated from Equation (4).…”

Section: Low-temperature Fracture Testmentioning

confidence: 99%

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Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

Zhu

Rahbar-Rastegar

et al. 2020

Applied Sciences

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It is well-accepted that the ionic copolymer poly (ethylene-co-methacrylic) acid (also named EMAA) is one type of self-healing material. This particular capability has great potential for extending the service life of infrastructures. In order to improve the rheological, mechanical, and self-healing properties of asphalt binder and asphalt mixtures, EMAA and styrene butadiene rubber (SBR) were selected as the additives. In this study, the effects of EMAA and SBR on the performance of bitumen and asphalt mixtures were examined and characterized using various parameters including rheological indices, Glover–Rowe parameter, ductility self-healing rate, fluorescence microscopy, and scanning electron microscope (SEM) test on binders, and different testing methods such as complex modulus, thermal stress-restrained specimen test (TSRST), disk-shaped compact tension (DCT), and fatigue–healing–fatigue test on the mixtures. The results showed that EMAA can significantly improve the stiffness and self-healing capacity of virgin and SBR modified binders and mixtures. Moreover, the cracking resistance of EMAA/SBR compound modified binder and mixture showed a significant improvement. However, EMAA is not recommended to be added as a modifier to virgin binders and mixtures due to its poor cracking resistance. Some novel tests and parameters mentioned in this paper are recommended for characterizing binders and mixtures in the future.

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Section: Low-temperature Fracture Testmentioning

confidence: 99%

Section: Low-temperature Fracture Testmentioning

confidence: 99%

Section: Low-temperature Fracture Testmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

Zhu

Rahbar-Rastegar

et al. 2020

Applied Sciences

Self Cite

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“…This can be achieved by various means: by selecting a certain type of the binder and its amount, type and gradation size of the aggregate mixture and also by incorporating different additives into the binder or asphalt mixture as a whole, e.g. polymers, recycled rubber, fibres or natural bitumen [3, 10,11,15,17,27].…”

Section: Introductionmentioning

confidence: 99%

“…Obtaining asphalt mixture that would possess higher resistance to cracking depends not only on the mix design process alone but must also incorporate proper test method [27], allowing to differentiate asphalt mixtures in terms of cracking characteristics. For many years' efforts were mainly put into development of test methods concerning resistance to permanent deformation (Wheel Tracking Test, Hamburg Wheel Tracking Test, Asphalt Pavement Analyzer), fatigue life (4-point bending test, 2-point bending test) or low-temperature properties (TSRST, ATCA).…”

Section: Introductionmentioning

confidence: 99%

Influence of bitumen type on cracking resistance of asphalt mixtures used in pavement overlays

Jaskuła

Szydłowski

Stienss

2018

TO - PK

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Cracking is one of the predominant distresses occurring in flexible pavements, especially in old pavements that were rehabilitated with an asphalt overlay. In such cases asphalt mixtures should be designed to ensure high resistance to reflective cracking because new asphalt layers are exposed to existing cracks of the old pavement. The nature of these cracks can be various (transverse, longitudinal as well as crazy cracking). One factor that minimizes this type of distress is the proper mix design process, which should involve selection of specific bitumen binder and mineral mix gradation. However, still there is no universally adopted laboratory test method that would allow to clearly assess resistance of asphalt mixtures to reflective cracking. This paper describes the usage of one of the devices developed to test asphalt mixtures in terms of such distress -Texas Overlay Tester. For this test, samples prepared in laboratory conditions (i.e. compacted with the use of Superpave Gyratory Compactor) as well as obtained in the field (by core drilling) can be used. The results are obtained not only quickly and easily, but also with sufficient repeatability. The described method characterizes both crack initiation and crack propagation properties of asphalt mixtures. In this work one type of mineral mixture was tested with 4 different types of bitumen (one neat bitumen, two ordinary polymer-modified and one polymer-modified with high polymer content). For selected cases extra additives (rubber and loose fibres) were also tested. In total, six asphalt mixtures were tested. A ranking of the used binders was created on the basis of the results in order to conclude which bitumen would ensure the best performance characteristics in terms of reflective cracking. The results have clearly shown that deliberate choice of the binder used in the asphalt mixture for the overlay will significantly improve its reflective cracking resistance or even fatigue resistance.

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Evaluation of Viscoelastic Properties and Cracking Behaviour of Asphalt Mixtures with Laboratory Aging

2018

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Comprehensive evaluation of low-temperature fracture indices for asphalt mixtures

Cited by 85 publications

References 15 publications

Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

Influence of bitumen type on cracking resistance of asphalt mixtures used in pavement overlays

Evaluation of Viscoelastic Properties and Cracking Behaviour of Asphalt Mixtures with Laboratory Aging

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