Thermooxidative aging mechanism of crumb‐rubber‐modified asphalt

Wang, Shifeng; Wang, Qiang; Li, Shuo

doi:10.1002/app.43323

Cited by 26 publications

(14 citation statements)

References 24 publications

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“…It has been shown that rubber particles could be dissolved or reduced in size when they are subjected to ageing at higher temperatures. This verifies the hypothesis that the rubber particles potentially undergo some degradation during the ageing process by means of devulcanisation/depolymerisation [3,4].…”

Section: Fig 2 Dent Moulds and The Location Of The Essential Work And Nonessential Work During The Progressing Of Cracking [12]supporting

confidence: 87%

“…The changes in the rheological properties of Recycled Tyre Rubber Modified Bitumen (RTR-MBs) after laboratory ageing have been investigated by many researchers [2][3][4][5]. The relative degree of change in the rheological properties of RTR-MBs has been shown to vary depending on ageing conditions, rubber content, rubber particle size and the source of base bitumen.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the rubber dissolution due to the effect of ageing has also been shown to enhance the ageing characteristics of binders by lowering the hardening and carbonyl formation rates [6]. Also, some of the rubber compounds, such as carbon black, have antioxidant characteristics that can improve the ageing resistance of rubberised bitumens [3].…”

Section: Introductionmentioning

confidence: 99%

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The effects of laboratory ageing on rheological and fracture characteristics of different rubberised bitumens

Subhy

Pires

Presti

et al. 2018

Construction and Building Materials

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Ageing of bituminous materials can result in loss of the durability of a flexible pavement. Using rubberised bitumens can enhance pavement performance while at the same time it solves a serious waste disposal problem. Combining Warm Mix Asphalt (WMA) additives with rubberised bitumens reduces the difficulties associated with the production of asphalt mixtures using this modified binder. This work was conducted to study the effect of ageing using fundamental parameters based on performance, i.e., CTOD and Glover-Rowe parameters have been related to pavement cracking. Different unmodified bitumens and rubberised bitumens were short-term aged using the Thin Film Oven Test (TFOT) and longterm aged using the Pressure Ageing Vessel (PAV). The rheological and fracture properties of the binders were studied before and after laboratory ageing. The results indicated that rubberized bitumens are more resistant to laboratory ageing. However, the pre-treatment with Sasobit® seemed to be detrimental when the materials were evaluated based on their fracture properties. The results also showed that base bitumen properties can affect the ageing mechanism of rubberised bitumens. Using softer bitumen could produce rubberised bitumens with superior anti-ageing properties when the analysis is based on linear viscoelastic properties using the Glover-Rowe parameter. However, these improvements were significantly reduced after ageing when the analysis is based on fracture properties.

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Section: Fig 2 Dent Moulds and The Location Of The Essential Work And Nonessential Work During The Progressing Of Cracking [12]supporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of laboratory ageing on rheological and fracture characteristics of different rubberised bitumens

Subhy

Pires

Presti

et al. 2018

Construction and Building Materials

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“…Undrained − Drained Base (1) IE = Drained − Base Base (2) The swelling of CR could enhance both PE and IE, since it has the light absorbance component of asphalt, one of the main parts of forming IE, and increases the volume of CR particles, which has a positive impact on PE [9,14]. Additionally, the reduced light components in the base asphalt caused by absorption and the increased volume of CR particles make the movement of CR particles difficult, both of which would increase the viscosity of binders, leading to an increase of thickness of the film coating the aggregates, which in turn, has a positive impact on the anti-fatigue and anti-ageing properties of AR pavement [11,[16][17][18][19][20][21]. Additionally, the swelling rate is also decided by the nature of the CR and the asphalt chemical component [2,14,22].…”

Section: Pe =mentioning

confidence: 99%

Study on the Effect of Microwave Processing on Asphalt-Rubber

Liu

Pei

et al. 2020

Materials

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The addition of crumb rubber (CR) into base asphalt plays a critical role in the improvement of the performance of Asphalt-Rubber (AR) binders. However, due to the problems, like high constructing temperature and energy consumption brought by the additional rubber, the use of AR binders could be limited in some areas. During this study, CR is processed by microwave is adopted to reduce the viscosity of the AR binders system, while the CR processed by long screw extrusion also is studied. First, the swelling (the absorption of light component into the CR particle) and dissolution (some molecules of CR dissolving into the base asphalt), both of which determine the improved performance of AR binders, are investigated by fluorescence microscopy and extraction tests. The size of the CR particle after swelling observed by fluorescence microscopy is used to evaluate the swelling rate of CR samples, and the ratio of the weight loss of CR samples after extraction to the original weight is employed to measure the dissolution rate. Then, Brookfield rotational viscometer and storage stability tests are conducted. Last, the rheologic performance, including high and low-temperature performances, is characterized by the dynamic shear rheometer (DSR) and bending beam rheometer (BBR), respectively. The fluorescence microscopy and extraction results show that microwave processing could effectively increase the swelling and dissolving rate, with the figures rising twofold and more than threefold, respectively. The results show that microwave processing could effectively reduce the viscosity of AR binders, with a viscosity decrease of 65% at 190 °C and, at the same time, the high temperature of Performance Grade (PG) decrease from 88 °C to 76 °C. The storage stability could be negatively impacted, but it is slight and the low-temperature performance is improved slightly.

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“…Moreover, they found that a higher CR content could improve the aging resistance of rubberized bitumen. In addition, carbon black and zinc oxide contained in CR can also act as an antioxidant to mitigate the aging happening in rubberized bitumen [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation of Aging Resistance for Rubberized Bitumen Modified by Using Microwave Activation Crumb Rubber and Different Modifiers

et al. 2020

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Different modification methods, such as adding modifiers and pretreating crumb rubber, have been developed to achieve decent engineering properties and reduce the viscosity of rubberized bitumen. This study evaluated the influence of the modification methods on the aging resistance for rubberized bitumen. Two types of crumb rubber—a 40-mesh crumb rubber and a microwave-pretreated crumb rubber—and two kinds of modifiers—Sasobit and Trans-polyoctenamer—were selected to prepare rubberized bitumen. The samples were subjected to a Thin-Film Oven Test for the simulation of the short-term aging condition, while a Pressure-Aging-Vessel test was used to simulate the long-term aging condition. The indexes of rubberized bitumen, including softening point, elastic recovery ratio, maximum load, ductility, fracture energy, phase angle, and dynamic modulus, were tested before and after aging. The result showed that trans-polyoctenamer displayed the best resistance to short-term aging, while Sasobit significantly improved the fracture energy of rubberized bitumen after short-term aging. Microwave pretreated partially destroyed the internal structure of crumb rubber, leading to a decrease of short-term aging resistance for rubberized bitumen. Compared with short-term aging, the changing trends of various indexes were basically same, except the discrepancy of properties indexes was reduced after long-term aging.

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Thermooxidative aging mechanism of crumb‐rubber‐modified asphalt

Cited by 26 publications

References 24 publications

The effects of laboratory ageing on rheological and fracture characteristics of different rubberised bitumens

The effects of laboratory ageing on rheological and fracture characteristics of different rubberised bitumens

Study on the Effect of Microwave Processing on Asphalt-Rubber

Laboratory Investigation of Aging Resistance for Rubberized Bitumen Modified by Using Microwave Activation Crumb Rubber and Different Modifiers

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