Quantitative determination for effective rubber content in aged modified asphalt binder

Geng, Jiuguang; Chen, Ming‐Yuan; Xia, Caiyun; Liao, Xiaofeng; Chen, Zhongda; Chen, Huaxin; Niu, Yanhui

doi:10.1016/j.jclepro.2021.129978

Cited by 16 publications

(2 citation statements)

References 36 publications

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“…The reason for the above phenomena is that the OD desulfurizer can promote the desulfurization and activation of crumb rubber powder by opening the S-S and C-S keys in the cross-linked network, and partially restore the properties of raw rubber to improve the compatibility with asphalt [ 41 ]. The greater the amount of OD desulfurizer content, the more obvious the desulfurization effect of crumb rubber [ 42 ]. When the content of OD desulfurizer is too high, some OD desulfurizer will not participate in the desulfurization reaction with crumb rubber and have a surplus of OD desulfurizer.…”

Section: Resultsmentioning

confidence: 99%

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Zhang

Zhang²,

Chen³

et al. 2022

Polymers

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A large number of waste tires are in urgent need of effective treatment, and breaking waste tires into crumb rubber powder for modifying asphalt has been proved as a good idea to solve waste tires. Crumb rubber modified asphalt not only has good high and low temperature performance, durability, and aging resistance but can also reduce pavement noise and diseases, which has wide application prospects. In this study, crumb rubber powder was desulfurized by mechanochemical method to prepare desulfurized crumb rubber modified asphalt. During the desulfurization process of crumb rubber, the effects of desulfurization process variables including desulfurizer type, desulfurizer content, and desulfurization mixing temperature and time were considered, and then the physical properties of modified asphalt were tested. The test results showed that after mixing crumb rubber powder with desulfurizer, the viscosity of crumb rubber powder modified asphalt can be reduced. Moreover, the storage stability of crumb rubber powder modified asphalt could also be improved by mixing crumb rubber with desulfurizer. Based on the physical properties of crumb rubber powder modified asphalt, the desulfurization process of selected organic disulfide (OD) desulfurizer was optimized as follows: the OD desulfurizer content was 3%, the desulfurization mixing temperature was 160 °C, and the mixing time was 30 min. In addition, Fourier infrared spectroscopy analysis was carried out to explore the modification mechanism of desulfurized crumb rubber powder modified asphalt. There is no fracture and formation of chemical bonds, and the modification of asphalt by crumb rubber powder is mainly physical modification.

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Section: Resultsmentioning

confidence: 99%

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Zhang

Zhang²,

Chen³

et al. 2022

Polymers

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show abstract

“…Asphalt rubber mixtures have been used successfully in various applications, and mechanical resistance improvements concerning permanent deformation, fatigue, and reflective and thermal cracking are described in the literature [ 24 , 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Contribution of Asphalt Rubber Mixtures to Sustainable Pavements by Reducing Pavement Thickness

et al. 2022

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Asphalt rubber mixtures have been used as pavement surface layers due to their ability to prevent early degradation, and are considered a sustainable option. This study performed analysis comparing the fatigue resistance of asphalt rubber mixtures of different combinations of asphalt bases, crumb rubber, and gradation, in order to estimate the performance of asphalt rubber mixtures as pavement surface layers. The methodology was developed in a laboratory and involved asphalt rubber production by continuous and terminal blend systems with different crumb rubbers and asphalt base types. Asphalt rubber mixtures with varying gradations and an unmodified asphalt mixture as a reference were produced. The mechanical behavior as a dynamic modulus and with respect to fatigue resistance was evaluated using a four-point bending test. In order to verify each of the asphalt rubber mixtures’ contribution as a surface layer, pavement structures were designed and their lifespans were compared. The findings showed that all asphalt rubber mixtures presented higher fatigue resistance than the reference. For pavement design, in comparison with the reference mixture, the thickness of the surface layer could be reduced by at least 50% while achieving the same life, proving its successful performance. This study demonstrated the effective contribution of crumb rubber from scrap tires as an asphalt modifier for producing sustainable mixtures with adequate fatigue performance.

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Macro-meso multiscale analysis of asphalt concrete in different laboratory compaction methods and field compaction

Zhao

Niu

Zhang³

et al. 2022

Construction and Building Materials

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Quantitative determination for effective rubber content in aged modified asphalt binder

Cited by 16 publications

References 36 publications

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Contribution of Asphalt Rubber Mixtures to Sustainable Pavements by Reducing Pavement Thickness

Macro-meso multiscale analysis of asphalt concrete in different laboratory compaction methods and field compaction

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