Effects of water activation of crumb rubber on the properties of crumb rubber-modified binders

Shatanawi, Khaldoun; Biro, Szabolcs; Thodesen, Carl; Amirkhanian, Serji

doi:10.1080/10298430802169424

Cited by 31 publications

(18 citation statements)

References 7 publications

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“…Microwave irradiation of crumb rubber surface method cleft the surface of the vulcanization network, giving crumb rubber higher surface activity, and therefore improves its viscoelastic nature and storage stability [37]. Shatanawi et al [38] explore the possibility of using hot water to activate the surfaces of crumb rubber. This process removes light oil fractions in the crumb rubber particles, where it reduces segregation between rubber particles and binder, thus improving its compatibility.…”

Section: Internal Factor: Crumb Rubber Type and Particle Sizementioning

confidence: 99%

A Review on the Effect of Crumb Rubber Addition to the Rheology of Crumb Rubber Modified Bitumen

Ibrahim

Katman

Karim

et al. 2013

Advances in Materials Science and Engineering

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Crumb rubber modification has been proven to enhance the properties of pure bitumen. This paper looks at some of the international standards for producing crumb rubber modified bitumen (CRMB) and reviews the effect of crumb rubber to the rheology of crumb rubber modified bitumen. The review shows that the rheology of CRMB depends on internal factors such as crumb rubber quantity, particle size, and pure bitumen composition, and external factors such as the mixing time, temperature, and also the modification technique. These factors govern the swelling process of crumb rubber particles that lead to the increase of viscosity of the modified bitumen. However, the mixing temperature and duration can cause rubber particles to depolymerize and subsequently cause loss of viscosity. Crumb rubber modification also improves the properties of bitumen by increasing the storage and loss modulus and enhancing the high and low temperature susceptibility. The effect of crumb rubber to aging properties of CRMB is also discussed. Finally several techniques of chemical modification to terminal blends of CRMB and the subsequent improvement to the settling property of CRMB are explained.

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Section: Internal Factor: Crumb Rubber Type and Particle Sizementioning

confidence: 99%

A Review on the Effect of Crumb Rubber Addition to the Rheology of Crumb Rubber Modified Bitumen

Ibrahim

Katman

Karim

et al. 2013

Advances in Materials Science and Engineering

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“…This is especially the case for rubber tires and their disposal becomes more and more critical for environmental and economic reasons. Consequently, due to high thermal and chemical stability, as well as availability and low cost, ground tire rubber (GTR), which can be made into different sizes, is now used in a variety of industrial applications to recycle waste tires [19]. More interestingly, one important application of GTR is to introduce into thermoplastic resins and composites to improve their impact strength [20–22].…”

Section: Introductionmentioning

confidence: 99%

Rotomolding of Foamed and Unfoamed GTR-LLDPE Blends: Mechanical, Morphological and Physical Properties

Dou¹,

Rodrigue

2018

Cellular Polymers

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In this work, a simple method is presented to produce ground tire rubber (GTR) -linear low density polyethylene (LLDPE) compounds and foams via rotational molding. In particular, different GTR concentrations (0 to 50% wt.) were dry-blended with different chemical blowing agent (CBA) content (0 to 1% wt.). From the samples produced, a complete set of characterization was performed in terms of mechanical properties (tensile, flexural and impact), density and morphological properties. The results show that increasing GTR content or CBA content not only decreased both tensile and flexural moduli, but decreased ultimate strength and strain at break. As expected, increasing blowing agent content decreased density. Besides, with respect to impact strength, the value of all samples decreased with the addition of GTR or CBA except for 0.2% wt. CBA of GTR-LLDPE composite foams, which nearly remain at the same level.

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“…Treatment methods of activate CR includes: microwave method, ultrasonic method, active gas method, biological desulfurization method and so on (Nikolskii et al, 2014;Torretta et al, 2015;Kedarisetty et al, 2016). Study found that most of the pre-treatment is not controlled or activation process is complicated (Shatanawi et al, 2009), such as: ultrasonic method will destroy the C-C bond which is a useful chemical bond inside the asphalt during the activation process. Active gas method needs to feed the degraded CR with strong oxidizing gas under high temperature conditions, this process is complicated and expensive, which is not suitable for industrial production.…”

Section: Introductionmentioning

confidence: 99%

Aging Properties and Mechanism of Microwave-Activated Crumb Rubber Modified Asphalt Binder

Zhou

et al. 2020

Front. Mater.

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Although crumb rubber modified asphalt (CRMA) has a better performance than matrix asphalt (MA) in road engineering, the application bottlenecks of this material lies in its high viscosity, poor workability and bad storage stability. Microwave technology is one of the solutions to the above problems. The objective of this study was to investigate the physical and chemical changes before and after aging of CRMA which was prepared by microwave activated crumb rubber, and the aging mechanism of microwave-activated crumb rubber modified asphalt (MACRMA). Through penetration, softening point, ductility, viscosity and DSR test, the high and low temperature performance and temperature sensitivity of MA, CRMA and MACRMA before and after aging were studied. These tests results revealed that microwave treatment can improve the anti-rutting ability and the anti-aging performance of rubber asphalt. According to gel permeation chromatography (GPC) test, the distribution changes of the internal molecular content of the three asphalts were determined during the aging process. Its test results showed that aging effect accelerated the conversion of small molecules to large molecules in asphalt, and the value of large molecular size (LMS) increases more after long-term aging. The microwave activation made the swelling reaction more intense, thereby delayed the conversion of LMS in the rubber asphalt. In addition, LMS has a high correlation with test indicators. The fourier transform infrared spectroscopy (FTIR) test was used to measure the functional group changes of each asphalt. The FTIR spectra indicated that microwave activation is mainly a process of physical change. The carbonyl and sulfoxide functional group indices of MACRMA were lower than those of MA and CRMA, which also confirmed that MACRMA has a better anti-aging ability.

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Effects of water activation of crumb rubber on the properties of crumb rubber-modified binders

Cited by 31 publications

References 7 publications

A Review on the Effect of Crumb Rubber Addition to the Rheology of Crumb Rubber Modified Bitumen

A Review on the Effect of Crumb Rubber Addition to the Rheology of Crumb Rubber Modified Bitumen

Rotomolding of Foamed and Unfoamed GTR-LLDPE Blends: Mechanical, Morphological and Physical Properties

Aging Properties and Mechanism of Microwave-Activated Crumb Rubber Modified Asphalt Binder

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