Fatigue performance of long-term aged crumb rubber modified bitumen containing warm-mix additives

Wang, Haopeng; Liu, Xueyan; Ven, Martin van de; Lü, Gongxuan; Erkens, Sandra; Skarpas, Athanasios

doi:10.1016/j.conbuildmat.2019.117824

Cited by 61 publications

(17 citation statements)

References 25 publications

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“…Due to the functionality of these new technologies, these additives can be considered “green” tools since the WMA replaces the hot mix asphalt (HMA), having a positive influence on global warming, air pollution, and the efficiency of the fuel; and thus decreasing the carbon footprint [ 21 , 22 , 23 , 24 ]. The use of WMA has increased due to many benefits that this technology can offer, such as: greater comfort and safety for construction workers, better workability at low temperatures, greater haulage distances, rapid rotation for traffic, extended paving window, lower power consumption and enabling the implementation of higher reclaimed asphalt pavement (RAP) content [ 19 , 25 , 26 , 27 , 28 ]. Furthermore, the WMA technology with CR is consistent with the idea of sustainable development, which focuses on the environment and economic development, social development, and environmental protection [ 26 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological Behaviour of WMA-Modified Asphalt Binders with Crumb Rubber

et al. 2022

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Crumb rubber (CR) is one of the materials most widely used in the road infrastructure industry due to its mechanical and environmental benefits as an asphalt binder modifier. Nonetheless, CR decreases the workability of mixes by increasing the viscosity of the binder, leading to an increase in the production temperatures of asphalt mixes. However, warm mix technologies can reduce the temperature demand associated with these processes. The preceding explains the growing interest in producing rubberised asphalt binders incorporating warm mix asphalt (WMA) additives. In this research, the mechanical and rheological properties of a 60/70 penetration grade asphalt binder modified with CR (at a dosage of 15, 18 and 21% by the wet process) and WMA chemical additives (Evotherm M1 and Iterlow T) were investigated. Laboratory tests included penetration, softening point, rotational viscosity, frequency sweep through dynamic shear rheometer (DSR), and multiple stress creep recovery (MSCR) tests. The results indicate that CR increases the stiffness of the asphalt binder, which is reflected in a lower penetration grade and improved softening point. It also improves its rutting resistance but decreases fatigue performance. Furthermore, it has been shown that under the conditions studied, the higher the CR content, the more elevated the degree of stiffness and performance of the asphalt binder. On the other hand, WMA technology decreases asphalt stiffness and performance at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Rheological Behaviour of WMA-Modified Asphalt Binders with Crumb Rubber

et al. 2022

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“…Also, the RuW mixture absorbs or distracts some amount of energy applied by static load, recording high recovery (the relaxation) compared to the HMA. This might be due to the role the rubber plays in the modified binder in creating a three-dimensional polymer network (Wang et al 2020), which prevents or interrupts the formation of microcracks under loading, also wax at temperatures below 100°C forms a crystalline lattice structure in the binder which acts as the basis for the increased resistance (Hurley andProwell 2005, Wasiuddin et al 2012). Furthermore, the increase in the testing temperature caused by the stiffening effect of the RuW mixture is higher compared to the HMA.…”

Section: Creep Testmentioning

confidence: 99%

“…This improvement of the fatigue life is because of increased adhesive force between the aggregates and PMAB. The chemical-based additive improves the fatigue resistance of the base bitumen owing to the 3-D polymer network of the modified binder (Wang et al 2020), delaying or preventing the microcracks formation under fatigue loading. Moreover, aggregate particles have a stronger bond with the binder as the thicker modified binder surrounds the aggregates (Presti 2013, Kim et al 2015; thus the performance of the RuW mixture is improved when compared to the HMA mixture.…”

Section: Four-point Bending Test (Fatigue Cracking Resistance)mentioning

confidence: 99%

Polymer modified asphalt binder – an approach for enhancing temperature sensitivity for emergency pavement repair

Hawesah

Sadique

Harris

et al. 2021

International Journal of Pavement Engineering

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Conventional hot mix plants operate to support large paving projects, making production more economic with high volume output. When repairs and maintenance are needed, it can be challenging to maintain small quantities of hot bituminous mixtures at a sufficient temperature, especially in the case of winter maintenance. Consequently, the repair materials cannot be compacted to the desired level on some occasions. This research aimed to develop a polymer modified asphalt binder with reduced temperature sensitivity for hand-laid and low-volume applications. The results showed that the highest penetration index has been achieved by modifying bitumen with 20% rubber and 2% wax. The FTIR and XRD analysis indicated that the bitumen, rubber and wax that react chemically to build 3D networks have an interlocked structure in the bitumen matrix resulting in reduced temperature sensitivity of the polymer modified asphalt binder. Furthermore, indirect tensile stiffness, permanent deformation, creep test and fatigue life test, water sensitivity and freeze-thaw cycle demonstrated an improvement in the asphalt mixture properties in terms of mechanical and durability perspectives. Overall, based on this investigation, modifying asphalt binder with 20% rubber and 2% wax resulted in stronger and durable asphalt mixture in comparison to traditional hot mix asphalt.

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“…Crumb rubber has been successfully applied into asphalt pavement as a performance enhancer for many decades, and many studies have proved that asphalt rubber (AR) can provide better rutting and fatigue resistance [20][21][22]. It was also found that the rubberized asphalt mixture provided higher modulus than the mixture with hard-grade binder and SBS-modified asphalt mixture [23].…”

Section: Asphalt Binders and Modifiersmentioning

confidence: 99%

Mechanism and Rheological Properties of High‐Modulus Asphalt

Yang

et al. 2020

Advances in Materials Science and Engineering

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High-modulus asphalt concrete (HMAC) is considered as an effective paving material for addressing the increasing heavy traffic and rutting problems. Therefore, one high-modulus agent was used in this study to prepare high-modulus asphalt binder with different dosages. The objective of this study is to investigate the performance and modification mechanism of high-modulus asphalt. The effects of high-modulus agent on the viscoelastic properties of asphalt with different dosages were quantified via rheological tests as compared to base binder and styrene-butadiene-styrene- (SBS-) modified asphalt. Moreover, the modification mechanism of the high-modulus agent was examined using fluorescence microscopy and infrared spectrum test. Based on rutting and dynamic modulus tests, the differences of road performances between high-modulus modified asphalt mixture and SBS-modified asphalt mixture were compared. The results demonstrate that the high-modulus agent improves the high-temperature performance and viscoelastic properties of the matrix asphalt. When the dosage increases to 6.67%, the modification effect is better than that of the SBS-modified asphalt. Furthermore, the results of the rutting test show that the high-modulus modified asphalt mixture has better resistance to deformation than the SBS-modified asphalt mixture. The dynamic modulus test further demonstrates that the high-modulus modified asphalt mixture exhibits superior performance in high-temperature range. Fluorescence microscopy shows that the high-modulus agent particles can swell in the asphalt to form polymer links that improve the viscoelastic properties of the asphalt. Based on the results of the infrared spectrum test, it can be concluded that a high-modulus agent changes the asphalt matrix via physical blending modification.

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Fatigue performance of long-term aged crumb rubber modified bitumen containing warm-mix additives

Cited by 61 publications

References 25 publications

Rheological Behaviour of WMA-Modified Asphalt Binders with Crumb Rubber

Rheological Behaviour of WMA-Modified Asphalt Binders with Crumb Rubber

Polymer modified asphalt binder – an approach for enhancing temperature sensitivity for emergency pavement repair

Mechanism and Rheological Properties of High‐Modulus Asphalt

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