Blends of bitumen with polyethylenes

Fawcett, Allan H.; McNally, Tony; Mcnally, G. M.; Andrews, F. R.; Clarke, Jadah S.

doi:10.1016/s0032-3861(98)00779-4

Cited by 78 publications

(96 citation statements)

References 6 publications

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“…paraffinic and aromatic compounds). Thus, their inclusion in the polymer-rich phase prevents the formation of larger crystallites and, as observed for EVA-VA18, yields an eventual broader size distribution (or broader melting peak) [29][30]. In consequence, the decrease in the EVA melting points after its blending with bitumen would result from the presence of crystallites with smaller size.…”

Section: Effect Of Vinyl Acetate Contentmentioning

confidence: 93%

“…In consequence, the decrease in the EVA melting points after its blending with bitumen would result from the presence of crystallites with smaller size. Moreover, for each EVA-binder, its addition to bitumen reduces the extent of crystallization of the polymer (Table 3) due either to migrated bitumen species hindering crystallization or even to a fraction of crystallizable molecules retained within the amorphous bitumen-rich phase [29]. Finally, the EVA melting events for the binders prepared with EVA-VA28…”

Section: Effect Of Vinyl Acetate Contentmentioning

confidence: 99%

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Influence of polymer melting point and Melt Flow Index on the performance of ethylene-vinyl-acetate modified bitumen for reduced-temperature application

Yuliestyan¹,

Cuadri²,

García‐Morales³

et al. 2016

Materials & Design

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The paving industry is currently demanding polymer modified bitumens (PMBs) with enhanced in-service performance and low enough viscosity at lower application temperatures. With this aim, this study focuses on the use of ethylene vinyl acetate (EVA) copolymers with low melting temperatures and explores the effect on the desired properties of the vinyl acetate (VA) content and Melt Flow Index (MFI). To that end, binders were prepared from EVA copolymers having varying VA contents from 7 to 33 wt.%, and MFI from 2 to 800. A comprehensive characterization based on viscous flow curves, dynamic shear temperature sweeps, standardized technological tests, differential scanning calorimetry (DSC) and optical microscopy analysis was conducted on EVAbinders with 5 and 7.5 wt.% EVA. Low VA contents proved to endow bitumen with improved performance at medium-high in-service temperatures. Interestingly, binder viscosity at 135ºC decreased with increasing the MFI, regardless the selected VA content.This means that tailored PMBs can be designed with both improved in-service performance at medium-high temperatures and reduced viscosity to facilitate polymerbitumen mixing, mineral coating and asphalt mix laydown/compaction at lower temperatures.

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Section: Effect Of Vinyl Acetate Contentmentioning

confidence: 93%

Section: Effect Of Vinyl Acetate Contentmentioning

confidence: 99%

Influence of polymer melting point and Melt Flow Index on the performance of ethylene-vinyl-acetate modified bitumen for reduced-temperature application

Yuliestyan¹,

Cuadri²,

García‐Morales³

et al. 2016

Materials & Design

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“…Hence, the addition to bitumen of different types of "passive" virgin polymers (SBS, SBR, EVA, etc) or waste polymers (plastics from agriculture, crumb tyre rubber, etc) (Fawcett et al, 1999) has shown to improve its performance in a broad range of inservice temperatures. These polymers are just physically mixed with bitumen.…”

Section: Introductionmentioning

confidence: 99%

Isocyanate-functionalized castor oil as a novel bitumen modifier

Cuadri

García‐Morales

Navarro

et al. 2013

Chemical Engineering Science

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The use of biomaterials from renewable sources in the synthesis of polyurethanederived polymers is lately receiving great attention from social, environmental and economic standpoints. In this work, prepolymers having different -NCO/-OH ratio were synthesized, by reaction of 4,4´-diphenylmethane diisocyanate (MDI) with castor oil (CO), to be used as modifying agent of asphaltic bitumen. Reactions between MDI and CO, performed with -NCO/-OH molar ratios of 8:1 and 4:1, have led to suitable bitumen modifiers. Modification has been related to chemical reactions between -NCO groups, some bitumen compounds and air moisture (or added water), which gave rise to binders with enhanced resistance to permanent deformation. The results showed that a 2 wt.% of MDI-CO prepolymer leads to binders with higher viscosity than that corresponding to a 3 wt.% Styrene-Butadiene-Styrene (SBS) block copolymer, a polymer and concentration widely used in the paving industry. Furthermore, the resulting prepolymers are liquids that can be easily mixed with bitumen at 90 ºC, which significantly lowers the typical temperature used for commercial SBS-modified bitumen (about 180 ºC). This fact may represent energy savings, reduce bitumen oxidation and result in improvements of health and safety conditions during the product manufacture.However, if high processing temperatures are required, MDI-CO based modifiers have demonstrated much higher thermal stability than prepolymers derived from crude oil (e.g. based on polyethylene glycol). As a result, NCO-terminated prepolymers obtained from biomass-derived polyols (castor oil in this article) may become a promising alternative to the use of other petrochemicals in the paving industry.

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“…The modification of asphalt concrete, with the incorporation of synthetic polymer binders can be considered as a solution to overcome the problems arising with the rapid increase in wheel loads and change in climatic conditions. Polymer modification can be considered as one solution to improve life fatigue, reduce the rutting and thermal cracking in asphalt road pavement [12,13]. However, asphalt, when blended or mixed with a polymer, forms a multiphase system, containing abundant asphaltenes which are not absorbed by the polymer.…”

Section: Introductionmentioning

confidence: 99%