Investigation of the Curing Variables of Asphalt-Rubber Binder

Billiter, Travis C.; Chun, Jay Sung; Davison, R. R.; Glover, Charles J.; Bullin, Jerry A.

doi:10.1080/10916469708949669

Cited by 46 publications

(33 citation statements)

References 2 publications

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“…Therefore, scrap tire rubber (crumb rubber, CR) has been widely studied primarily due to its abundance and environmental protection. Asphalt modified by crumb rubber is an important approach to alleviating this problem and significantly save asphalt road production cost and hence has attracted worldwide attention (Heitzman, 1992;Billiter, Chun, et al, 1997) for over two decades. Compared to conventional road surfaces, those made from crumb rubbermodified asphalt (designated as CRMA) have a longer service life, with 50-70% decrease in noise level.…”

Section: Introductionmentioning

confidence: 99%

Crumb Rubber–Modified Asphalt: Microwave Treatment Effects

Zhou

et al. 2011

Petroleum Science and Technology

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Crumb rubber pretreatment by microwave irradiation before blending with an asphalt matrix improves the properties of rubber-asphalt blends. This treatment cleft the surface vulcanization network, resulting in higher surface activity of the crumb rubber and improved compatibility with asphalt. This new rubber blend exhibited minor temperature susceptibility behaviors and high ductility at 5 ı C and an improved viscoelastic nature and storage stability. Characterization has also been performed to elucidate the mechanism for this improvement using a microwave treatment technique.

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Section: Introductionmentioning

confidence: 99%

Crumb Rubber–Modified Asphalt: Microwave Treatment Effects

Zhou

et al. 2011

Petroleum Science and Technology

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“…Molecular weight of asphalt has a major role in controlling the behavior between asphalt and CRM; lower molecular weight asphalt interacts readily with CRM, where the lighter asphalt components penetrate into the CRM; such interaction may result, however, in deterioration of the colloidal stability of asphalt leading to coagulation of asphaltenes [12]. Vulcanized rubber can be devulcanized and depolymerized in asphalt under the effect of high temperature shear; this increases when asphalt is rich in aromatics [13].…”

Section: Journal Of Materialsmentioning

confidence: 99%

Investigation of the Physical and Molecular Properties of Asphalt Binders Processed with Used Motor Oils

Ragab

Abdelrahman

2015

Journal of Materials

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In this work we investigated the performance aspects of addition of used motor oils (UMO) to neat and crumb rubber modified asphalts (CRMA) and related that to the change of molecular size distribution of modified asphalt's fractions; asphaltenes, saturates, naphthene aromatics, and polar aromatics. Based on the results of temperature sweep viscoelastic tests, addition of crumb rubber modifier (CRM) alone or with UMO results in the formation of internal network within the modified asphalt. Based on the results of short and long term aged asphalts, the utilization of combination of UMO and CRM enhanced the aging behavior of asphalt. Bending beam rheometer was utilized to investigate the low temperature behavior of UMO modified asphalts. Based on those tests, the utilization of the UMO and CRM enhanced the low temperature properties of asphalts. Based on the results of the asphalt separation tests and the Gel Permeation Chromatography (GPC) analysis, it was found that saturates and naphthene aromatics are the two asphalt fractions that have similar molecular size fractions as those of UMO. However, UMO only shifts the molecular sizes of saturates after interaction with asphalt. Results also show that polar aromatics pose higher molecular size structures than UMO.

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“…As reported elsewhere (Billiter et al, 1997;Navarro et al, 2005Navarro et al, , 2007, at a processing temperature of 180°C, only 4% of the structural network of the rubber added was dissolved or disintegrated during sample digestion. Hence, the mechanical properties of the modified bitumen are mainly influenced by the remaining particles of rubber and, to a lesser extent, by the dissolved/ dispersed fraction, and also by the bituminous phase.…”

Section: Mp1mentioning

confidence: 64%