Characterization of Paving Asphalts by Differential Scanning Calorimetry

Claudy, P.; Létoffé, J. M.; King, Gayle; Planche, Jean‐Pascal; Brule, B

doi:10.1080/08843759108942254

Cited by 84 publications

(47 citation statements)

References 4 publications

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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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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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“…Given that molecules with polar or bulky groups show higher Tg's than molecules with flexible chains of apolar repeat units [2], and the increase in complexity and rigidity of bitumen fractions in the order of S < A < R < As, we expect their Tg's to show the same order. Claudy et al [9] have shown by DSC that the saturates of bitumen have lower Tg's than the aromatics (-60°C and -20°C, respectively), but the Tg of the resins and the asphaltenes have remained elusive. A simple geometric progression would place the respective Tg's of the resins and asphaltenes at 20 and 60°C, and that of the maltenes at -20°C.…”

Section: Heat Capacitymentioning

confidence: 99%

“…Based on a common interpretation [9], there would be a glass transition temperature (Tg) centered around -20ºC, followed by two endotherms at ~20ºC and ~50ºC for the melting of saturates. Interestingly, this small decrease of the reversing curve remains hidden in the total heat flow curve.…”

Section: Conventional and Modulated Dscmentioning

confidence: 99%

“…The DSC curve reveals a Tg and two endotherms ( Figure 1). Claudy et al [9] have related Tg to the saturates and aromatics fractions, and the endotherms to the saturates, while Harrison et al [8] have related the endotherms to fractions other than the saturates.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the rather uninformative rheological curve of bitumen, much work in the last decade has been performed with differential scanning calorimetry (DSC) to study bitumen microstructure and its relation to physical properties [8][9][10][11][12]. The DSC curve reveals a Tg and two endotherms ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Bitumen microstructure by modulated differential scanning calorimetry

2001

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/S0040-6031(01) Thermochimica Acta, 374, 2, pp. 105-114, 2001-07-10 Bitumen microstructure by modulated differential scanning calorimetry Masson, J-F.; Polomark, G. M. Bitumen microstructure by modulated differential scanning calorimetry Masson, J-F. ; Polomark, G. M.A version of this paper is published in / Une version de ce document se trouve dans : Thermochimica Acta, pp. 105-114, v. 374, no. 2, 2001 www.nrc.ca/irc/ircpubs assigned to the maltenes, the other at 70°C to the asphaltenes. The heat capacity of these transitions was found to depend on thermal history. From the total heat capacity, it was calculated that the relative size of the bitumen repeat unit is between 36 and 91 g mol -1 , which given an average molecular weight of 300-1000 g mol -1 for bitumen, translates into a "degree of polymerisation" of ~10. After cooling from the melt and annealing at 22°C, bitumen microstructure was found to develop in three stages. Most rapid is an ordering process that occurs when bitumen is quenched from the melt. It is postulated that this first stage arises from the partial ordering of simple aromatic structures into micro-and nano-phases; a second stage, which ends within ~3h of annealing, relates to the ordering of somewhat larger aromatic structures; and a third stage, which ends in ~16h, is thought to arise from the ordering of the largest bitumen structures, the resins and the asphaltenes. The development of bitumen microstructure and the calculations of the entropy and enthalpy of transitions suggest that bitumen is a multi-phase system with a small crystalline phase, and a large mesophase, i.e, a structured amorphous phase. NRCC-44278

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Microstructure of triblock copolymers in asphalt oligomers

Adedeji

Giles

et al. 1997

J. Polym. Sci. B Polym. Phys.

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Characterization of Paving Asphalts by Differential Scanning Calorimetry

Cited by 84 publications

References 4 publications

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

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

Bitumen microstructure by modulated differential scanning calorimetry

Microstructure of triblock copolymers in asphalt oligomers

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