Effects of partial oxidation of crumb rubber on properties of rubberized mortar

Chou, Liang-Hsing; Yang, Cho-Kun; Lee, Maw-Tien; Shu, Chia-Chen

doi:10.1016/j.compositesb.2010.09.009

Cited by 57 publications

(22 citation statements)

References 16 publications

(18 reference statements)

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“…Large number of treatment methods has been used to improve these properties. Some of these include the use of sodium hydroxide saturated aqueous solution, use of epoxy and polyurethane adhesives, chlorination of waste rubber, graft polymerisation, ultraviolet surface modification, partial modification by oxidation process, plasma treatment using oxygen and microwave plasma at atmospheric and low pressure, bio‐process using thiophillic micro‐organisms, chemical modification using carbon black, and so on. However, none of the techniques were focused on controlling the absorption properties of waste rubber aggregates.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the microwave processing of waste tyre rubber aggregates to enhance their surface properties for their use in rubberized bituminous mixtures

Ateeq

Al-Shamma’a

2017

Micro & Optical Tech Letters

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This experimental study uses the microwave technology to process the waste tyre rubber aggregates to enhance the interaction properties of waste rubber and bitumen by smoothing its surface. This was to make the waste rubber less reactive to the bitumen sample at the elevated temperatures of around 140-1708C. Parameters such as the microwave power, the height of the sample inside the processing chamber, and the processing time have been considered and optimized. The results show that the microwave processing technique designed in this study has significantly smoothened the surface of waste rubber. Scanning electron microscope surface analysis has been carried out to confirm the changes and smoothness of the rubber surface in comparison with the untreated waste rubber aggregates. In addition, microwave spectroscopy analysis has been carried out to confirm the reduction in the absorption properties of waste rubber. The microwave curves of the bitumen samples extracted from the treated rubber-bitumen blend are comparable with the pure bitumen sample with minute shifts in the resonant peaks. The results show the potential of the technique and recommends designing a dedicated processing unit to further improve it through parameters such as volumetric and uniform surface treatment, penetration depth of the microwaves. K E Y W O R D S microwave analysis, microwave processing, microwave spectroscopy, robust processing, rubber absorption properties, surface properties, waste rubber aggregates Microw. Opt. Technol. Lett. 2017;2951-3205 wileyonlinelibrary.com/journal/mop Abstract This article presents a thermally tunable Fano resonator obtained by asymmetrically coupling a conductive rubberbased H-shaped split ring resonator (SRR) and a copper 2960 |

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Section: Introductionmentioning

confidence: 99%

Experimental study on the microwave processing of waste tyre rubber aggregates to enhance their surface properties for their use in rubberized bituminous mixtures

Ateeq

Al-Shamma’a

2017

Micro & Optical Tech Letters

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“…To improve rubber-cement paste chemical/physical bonding [18], several rubber pre-treatments have been investigated such as washing with water [21,35,42], polyvinyl alcohol [43], NaOH [13,41,44,45], Ca(OH) 2 [46], silane coupling agents [47], organic sulphur compounds [48] or acid [40], as well as partial oxidation of the rubber surface [49], exposure to UV radiations [50] or pre-coating with cement [51], mortar [26], silica fume [39], limestone [52] or sand [45]. Despite some success in rubber pre-treatments (strength increase in the range of 3-40% [18,26,41,51,52]), results are often scattered and inconclusive, particularly when mixes with pre-treated rubber are not compared to mixes with as-received rubber [35,42].…”

mentioning

confidence: 99%

Optimisation of rubberised concrete with high rubber content: An experimental investigation

Raffoul

Garcia

Pilakoutas

et al. 2016

Construction and Building Materials

213

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“…After devulcanization for 20 days, a peak at 1088 cm -1 (S=O stretching) was formed and the intensity of the peak at 1540 cm -1 was substantially diminished. This result suggested that B. cereus TISTR 2651 not only ruptured the partial main chains of rubber molecules but also oxidized the sulfide crosslinks via some metabolic pathway [21,41]. Additionally, the band located at 1662 cm -1 (C=C deformations) had the high intensity in the devulcanized sample.…”

Section: The Metabolic Pathway Of B Cereus Tistr 2651 On the Devulcamentioning

confidence: 92%

Devulcanization of natural rubber vulcanizates by Bacillus cereus TISTR 2651

Kaewpetch¹,

Prasongsuk²,

Poompradub³

2019

Express Polym. Lett.

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The ability of Bacillus cereus TISTR 2651 to perform biological devulcanization of natural rubber cured by conventional vulcanization (CV), semi-efficient vulcanization or efficient vulcanization was studied. Among the three curing systems, B. cereus TISTR 2651 could specifically devulcanize rubber products formed from the CV system the best, removing 26.44% of the sulfur within 20 days. Moreover, B. cereus TISTR 2651 could oxidize and desulfurize the sulfide crosslinks in the CV rubber and transform them to oxygen-containing sulfur-based groups via the 4S pathway. Additionally, the molecular weight, crosslink density and gel fraction of the CV rubber were also significantly decreased from the original levels. Horikx analysis was used to propose the mechanism of bacterial devulcanization. Finally, ground tire rubber (GTR) was devulcanized by B. cereus TISTR 2651 and the percentage of sulfur removal was about 27.98 for 20 days, where similar results were also obtained. Accordingly, B. cereus TISTR 2651 can be applied for the management of rubber waste, leading towards a solution of this environmental problem.

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Effects of partial oxidation of crumb rubber on properties of rubberized mortar

Cited by 57 publications

References 16 publications

Experimental study on the microwave processing of waste tyre rubber aggregates to enhance their surface properties for their use in rubberized bituminous mixtures

Experimental study on the microwave processing of waste tyre rubber aggregates to enhance their surface properties for their use in rubberized bituminous mixtures

Optimisation of rubberised concrete with high rubber content: An experimental investigation

Devulcanization of natural rubber vulcanizates by Bacillus cereus TISTR 2651

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