Improving the rheological properties of crumb rubber modified binder using hydrogen peroxide

Shatanawi, Khaldoun; Biro, Szabolcs; Naser, Mohammad; Amirkhanian, Serji

doi:10.1080/14680629.2013.812535

Cited by 41 publications

(12 citation statements)

References 7 publications

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“…It can be seen that the introduction of hydrogen peroxide resulted in the rise of the free isocyanate content, pointing to the reduced reactivity of GTR with TDI. Previous reports indicated rubber surface activation by creating carboxylic sites [28]. Hydrogen peroxide causes the generation of carbonium ions on the surface, which are converted into carboxylic sites.…”

Section: Changes In Gtr Structurementioning

confidence: 97%

The Impact of Ground Tire Rubber Oxidation with H2O2 and KMnO4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams

et al. 2021

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The use of waste tires is a very critical issue, considering their environmental and economic implications. One of the simplest and the least harmful methods is conversion of tires into ground tire rubber (GTR), which can be introduced into different polymer matrices as a filler. However, these applications often require proper modifications to provide compatibility with the polymer matrix. In this study, we examined the impact of GTR oxidation with hydrogen peroxide and potassium permanganate on the processing and properties of flexible polyurethane/GTR composite foams. Applied treatments caused oxidation and introduction of hydroxyl groups onto the surface of rubber particles, expressed by the broad range of their hydroxyl numbers. It resulted in noticeable differences in the processing of the polyurethane system and affected the structure of flexible composite foams. Treatment with H2O2 resulted in a 31% rise of apparent density, while the catalytic activity of potassium ions enhanced foaming of system decreased density by 25% and increased the open cell content. Better mechanical performance was noted for H2O2 modifications (even by 100% higher normalized compressive strength), because of the voids in cell walls and incompletely developed structure during polymerization, accelerated by KMnO4 treatment. This paper shows that modification of ground tire rubber is a very promising approach, and when properly performed may be applied to engineer the structure and performance of polyurethane composite foams.

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Section: Changes In Gtr Structurementioning

confidence: 97%

The Impact of Ground Tire Rubber Oxidation with H2O2 and KMnO4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams

et al. 2021

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“…Based on laboratory test results, it is reported that the CR-modified asphalt binder performs better than the acrylonitrile butadienestyrene (ABS) (Kaloush et al, 2012;Shatanawi, Biro, & Naser, 2013) and SBS polymer-modified binders (Fernandes, Forte, & Leite, 2008) considering a number of key properties. Some investigators (Carreau, Bousmina, & Bonnioy, 2000;Giavarini, Santarelli, & Braga., 1993) have stated that SBS is the most effective binder to date, but Martin, Bakos, and MacLeod (2013) pointed out that the SBS effectiveness depends on its interaction with the different polar and non-polar components of the asphalt and on the morphology of their blend.…”

Section: Introductionmentioning

confidence: 98%

Microstructure and rheological properties of aged and unaged polymer-modified asphalt binders

Wang

Razaqpur

Xing

et al. 2015

Road Materials and Pavement Design

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The effects of ageing on the microstructure and dynamic rheological properties of three modified asphalt binders are investigated. The asphalt modifiers used comprise crumb rubber (CR), styrene-butadiene-styrene (SBS) block copolymer and a blend or combination of CR and SBS (CCR). To investigate the modified asphalts microstructure, scanning electron microscopy is applied, while for assessing rheological properties at a wide range of temperature, Bending Beam Rheometry and Dynamic Shear Rheometry are employed. Ageing of asphalt during construction and under service conditions is simulated using the rolling thin film oven test and the Pressurised Ageing Vessel procedures. It is observed that ageing makes all three modified asphalts harder, increases their resistance to deformation under high temperatures, and decreases their fatigue and cracking resistance at low temperatures. Comparatively, the CR maintains its bond with the asphalt better than the SBS and the CR-modified asphalt exhibits lower stiffness and lower degree of ageing under cold temperature, while it shows the highest resistance to high-temperature deformation and fatigue. On the contrary, the SBS-modified asphalt exhibits the worst performance in practically every respect compared to the CR-and CCR-modified asphalts.

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“…However, the addition of rubber reduces the mechanical strength of the concrete [102,103]. Therefore, to mitigate this effect, it is necessary to treat the rubber prior to its incorporation [104][105][106]. For instance, García et al [107] evaluated the effects of three different treatments applied to ELT rubber before its incorporation in cement mortar samples.…”

Section: Incorporation Of End-of-life Tyre Rubber Into Concretementioning

confidence: 99%

Different Approaches to Develop More Sustainable Concrete Alternatives

Pradena¹,

César²

2022

Sustainability of Concrete With Synthetic and Recycled Aggregates

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As important as it is, sustainability related with the concrete material is more than reducing the amount of cement in concrete mixes. In effect, there can be other types of contributions to a sustainable development using this fundamental material. The purpose of this book chapter is to analyse some of these approaches, in particular, concrete durability, reducing the amount of required concrete (and then cement) through innovative structural design, and reducing the amount of aggregates used in the concrete material. More specifically, examples and results obtained in Chile with biological self-healing concrete, thinner concrete pavements and concrete with industrial and domestic waste as partial aggregate replacement are included in the chapter. Due to its importance, the geo-dependency of the concrete material is addressed as well.

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Improving the rheological properties of crumb rubber modified binder using hydrogen peroxide

Cited by 41 publications

References 7 publications

The Impact of Ground Tire Rubber Oxidation with H2O2 and KMnO4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams

The Impact of Ground Tire Rubber Oxidation with H2O2 and KMnO4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams

Microstructure and rheological properties of aged and unaged polymer-modified asphalt binders

Different Approaches to Develop More Sustainable Concrete Alternatives

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