Influence of surface area and size of crumb rubber on high temperature properties of crumb rubber modified binders

Shen, Junan; Amirkhanian, Serji; Tang, Boming

doi:10.1016/j.conbuildmat.2007.12.005

Cited by 173 publications

(60 citation statements)

References 8 publications

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“…Binder characteristics are dependent not only upon chemical composition of employed components, but also on CR dosage, particle size and morphology. In such a context, it has been proven that the intensity of the above described interaction phenomena tends to increase with CR dosage and specific surface area (Shen et al, 2009). Therefore, CRs which are considered more reactive are those which are finer, constituted by rough, irregular particles.…”

Section: Cr-bitumen Interactionmentioning

confidence: 99%

Characterization of crumb rubber from end-of-life tyres for paving applications

et al. 2015

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Crumb rubber (CR) derived from grinding of end-of-life tyres (ELTs) may be successfully used as a bitumen modifier or as a supplementary component in the production of bituminous mixtures employed for the construction and maintenance of road pavements. However, CRs deriving from different sources and production processes yield effects on performance of corresponding paving mixtures under traffic loading and on gaseous emissions produced during laying on site which may change considerably depending upon their physical and chemical properties. In order to quantitatively assess the possible variability of CR characteristics, 16 samples were taken from 9 Italian and 2 foreign ELT processing plants. Investigation activities included field surveys, during which plants were examined in detail, and laboratory tests, which focused on physical and chemical characterization of CR. Based on the analysis of available technical information and experimental data, it was possible to find relationships between the peculiar characteristics of treatment cycles and corresponding CR properties.

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Section: Cr-bitumen Interactionmentioning

confidence: 99%

Characterization of crumb rubber from end-of-life tyres for paving applications

et al. 2015

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“…The study of bitumen rheology is an important phenomenon to characterise the dynamic mechanical behaviour of binders 7,8 . Previous research has shown that the major mechanism of the bitumen -rubber interaction is the swelling of the rubber particles because of the absorption of the light fractions oil into the rubber particles and stiffening of the residual binder [9][10][11][12] . According to a study 13 , the higher the crumb rubber content is, the higher viscosity at 135 °C could improve the rutting properties.…”

Section: Introductionmentioning

confidence: 99%

Investigating the rheological properties of crumb rubber modified bitumen and its correlation with temperature susceptibility

Mashaan

Karim

2012

Mat. Res.

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There is substantial evidence on the advantages of using crumb rubber in enhancing conventional bitumen properties, gaining environmental protection and boosting industrial-economical benefits. Thus, the use of this ingenious additive in bitumen modification through sustainable technology is highly advocated.The main objective of this research is to investigate the effects of different blending conditions (of time and temperature) and various crumb rubber contents on the properties of bitumen binders. Testing was conducted using the Dynamic shear rheometer (DSR) test and softening point test. The results showed that differing crumb rubber contents and blending temperature have significant effects on modified binder properties whereas the blending time showed an insignificant effect. Higher blending temperature and crumb rubber content were found to influence the interaction of bitumen-rubber blends and also increased the swelling rate of rubber particles, resulting in an increase in complex shear modulus (G*), storage modulus (G'), loss modulus (G") and softening point as well as a decrease in phase angle (δ). Thus, the modified bitumen became less susceptible to deformation after stress removals. The study also presented a considerable relationship between rheological parameters (G*, G', G' and δ) and softening point in terms of predicting physical-mechanical properties regardless of blending conditions. Thus, in terms of elasticity for the softening point data, the storage modulus and phase angle were found to be good indicators of binder elasticity. When softening point is made available, a prediction about binder ability to recover its original shape after stress removals can be done.

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“…Generally, the tensile modulus, tensile strength, and fatigue life of CRM decrease with increasing particle size of CR at a given CR content [22]. After a medium-size to a fine-size treatment, CRM asphalt can have great improvement of properties [23,24]. Also, CR with a finer size and larger surface area has broader application range and can be sold at a higher price [25].…”

Section: Introductionmentioning

confidence: 96%

Pulverization of end-of-life tires by ultra-high pressure water jet process

Wang

Kang

Zhao

2016

Journal of Polymer Engineering

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Abstract Crumb rubber (CR), as a final product from end-of-life tires through size reduction process, has proved an appropriate end product for accumulated discard waste tires all around the world. Unlike pre-existing pulverization methods, such as ambient or cryogenic grinding and solid-state shear extrusion, an entire cool pulverization process utilizing ultra-high pressure water jet (UHPWJ) was proposed in this paper. Pulverization experiments under various processing parameters were designed and conducted. The particle size distributions of produced CR were obtained using laser particle analyzer. Microscopic morphologies of CR and rubber fracture surface were observed under scanning electron microscopy. The crosslink density and gel fraction of produced CR were experimentally determined. Influence of four main processing parameters as pump pressure, transverse velocity, standoff distance and impacting angle was discussed in detail, and the most suitable processing parameters were recommended. The results show that the particle size distribution of produced CR with UHPWJ is between 45 μm and 200 μm, and the surface of CR is coarse and porous. High compressive shear effect and erosion are the main mechanisms in UHPWJ pulverization. Besides, the produced CR has already been partly devulcanized after UHPWJ pulverization, and polymer degradation occurred in the meanwhile.

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Influence of surface area and size of crumb rubber on high temperature properties of crumb rubber modified binders

Cited by 173 publications

References 8 publications

Characterization of crumb rubber from end-of-life tyres for paving applications

Characterization of crumb rubber from end-of-life tyres for paving applications

Investigating the rheological properties of crumb rubber modified bitumen and its correlation with temperature susceptibility

Pulverization of end-of-life tires by ultra-high pressure water jet process

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