A structure‐related model to describe asphalt linear viscoelasticity

Lesueur, Didier; Gérard, Jean‐François; Claudy, P.; Létoffé, J. M.; Planche, Jean‐Pascal; Martin, Didier

doi:10.1122/1.550764

Cited by 212 publications

(122 citation statements)

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“…Because of this complex nature, it is always difficult to identify transitions that occur in asphaltic materials. It is generally accepted that maltenes have a glass transition around Ϫ20°C (20), and two melting temperatures around 20°C and 50°C, generated by a small crystalline phase formed from saturates (21). However, other transitions have been observed (22,23).…”

Section: Discussionmentioning

confidence: 99%

Temporary networks in polymer‐modified asphalts

Polacco

Stastna

Vlachovicova

et al. 2004

Polymer Engineering & Sci

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The viscosity functions of several polymer-modified asphalts (PMAs) were studied at different temperatures in steady-state rate sweep tests. The materials were obtained by mixing different base asphalts with either styrene-butadiene-styrene (SBS), ethylenevinylacetate (EVA) or reactive ethylene terpolymers (RET). The first two polymers form a physical network that is swollen by the asphalt, while the latter is functionalized with glycidylmethacrylate (GMA) and can crosslink and/or chemically bond with the molecules of asphaltenes. In the presence of SBS or EVA, at certain temperatures, the viscosity curves exhibit a Newtonian behavior at low shear rates, followed by two distinct shear-thinning phenomena. In some cases, the first shear-thinning is preceded by a small shear-thickening region. Similar phenomena are not present in the viscosity curves of the RET-modified asphalts and can be related to a temporary nature of the physical polymer network.

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Section: Discussionmentioning

confidence: 99%

Temporary networks in polymer‐modified asphalts

Polacco

Stastna

Vlachovicova

et al. 2004

Polymer Engineering & Sci

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“…The complexity, aromaticity, heteroatom content, and molecular weight increase in the order S<A<R<As [1]. A colloidal model, consisting of asphaltenes being dispersed into an oily matrix of maltenes and peptized by resins, is traditionally used to describe bitumen behaviour [2,3].…”

Section: Introductionmentioning

confidence: 99%

Processing of bitumens modified by a bio-oil-derived polyurethane

Cuadri¹,

García‐Morales²,

Navarro³

et al. 2014

Fuel

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Castor oil (CO) functionalized by isocyanate groups (-NCO) is proposed as a novel bio-based reactive polyurethane (PU) for bitumen modification. This work presents a comparative analysis conducted on blends of bitumen and 2 wt.% of a PU prepolymer prepared by NCO-functionalization of castor oil. Four preparation procedures were evaluated, which resulted from the combination of two processing times (1h or 24h, at 90ºC) followed by two different post-treatments (water addition or ambient curing for up to 6 months). It was found that the degree of modification attained after posttreatment depends on the previous processing conditions. Thus, short processing times are required if the binder is further subjected to ambient curing. Instead, the success of the water-addition modification falls on a previous long processing step. As revealed by rheological tests, ambient curing was seen to be by far a more efficient way of modification if compared to direct addition of water, and makes clear that the resulting binder evolves towards a better performance when in service. In that sense, Thin Layer Chromatography tests, Modulated DSC and AFM images demonstrated a more complex microstructure characterized by the presence of a larger content of molecules with higher polarity, size and molecular weight.

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“…The temperature dependent rheological behaviour of bitumen depends on the chemical structure and intermolecular associations (structuring) [4]. This structuring is largely responsible for the physical properties of bitumen thus the prediction of the performance of asphalt pavements should also directly be related to this [2,11]. Structuring may occur at various ranges from molecular to macroscopic but most of the asphalt researchers have concerned themselves with the microstructures of the bitumen itself.…”

Section: The Importance Of Understanding the Fundamental Behaviourmentioning

confidence: 99%

“…From extensive atomic force microscopy (AFM) investigations shown in earlier papers [2][3][4][11][12][13][14], it has been shown that bitumen has the tendency to phase separate under certain kinetic conditions, leading to a predominant clustering of two types of phases, illustrated in Figure 2. To ensure that the found phenomena of phase separation in bitumen is not a side effect of sample preparation or a surface effect in the AFM, several other experiments were also performed, among which an extensive neutron scattering study [12].…”

Section: The Importance Of Understanding the Fundamental Behaviourmentioning

confidence: 99%

Micro-mechanical Investigation of Low Temperature Fatigue Cracking Behaviour of Bitumen

Das

Jelagin

Birgisson

et al. 2012

7th RILEM International Conference on Cracking in Pavements

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Abstract.In an effort to understand the effect of low temperature fatigue cracking, atomic force microscopy (AFM) was used to characterize the morphology of bitumen. In addition, thermal analysis and chemical characterization was done using differential scanning calorimetry (DSC) and thin-layer chromatography / flame ionization detection (TLC/FID), respectively. The AFM topographic and phase contrast image confirmed the existence of bee-shaped microstructure and different phases. The bitumen samples were subjected to both environmental and mechanical loading and after loading, micro-cracks appeared in the interfaces of the bitumen surface, confirming bitumen itself may also crack. It was also found that the presence of wax and wax crystallization plays a vital role in low temperature cracking performance of bitumen.

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A structure‐related model to describe asphalt linear viscoelasticity

Cited by 212 publications

References 0 publications

Temporary networks in polymer‐modified asphalts

Temporary networks in polymer‐modified asphalts

Processing of bitumens modified by a bio-oil-derived polyurethane

Micro-mechanical Investigation of Low Temperature Fatigue Cracking Behaviour of Bitumen

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