The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

Lesueur, Didier

doi:10.1016/j.cis.2008.08.011

Cited by 1,303 publications

(837 citation statements)

References 192 publications

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“…In bituminous asphalt mixes, mineral fillers (with a particle size below 75 μm) typically represent from 2 to 12 wt.% on their total mineral matter [3]. Hence, a bitumen/filler blend (commonly referred to as mastic) naturally forms when bitumen and aggregates are mixed.…”

Section: Introductionmentioning

confidence: 99%

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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%

“…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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“…This "modified" colloidal index, which derived from that used elsewhere [3] and expressed in terms of the "standard" SARAs fractions, is defined as -14 -follows: mod saturates + LPAs + HPAs C.I. = aromatics + resins (3) where LPAs and HPAs refer to low and high polarity asphaltenes, respectively. Table 1 displays the evolution with curing time of the "modified" colloidal index, for 3 and 9…”

Section: On the Chemistry Behind Bitumen Modification Via Thioureamentioning

confidence: 99%

“…According to this model, asphaltenes are dispersed into an oily matrix of maltenes, and surrounded by a shell of resins (which becomes thicker as temperature decreases). Thus, bitumen physicochemical and rheological properties strongly depend on both temperature and the relative proportion of the "SARAs" fractions [2,3].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the viscoelastic properties of bituminous binders via thiourea-modification

Cuadri¹,

García‐Morales²,

Navarro³

et al. 2012

Fuel

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Although added in a very low concentration, bitumen controls the final properties and performance of the resulting asphalt mixture. As an alternative to classic bitumen modification with polymers, we herein propose the use of thiourea, which has proved to efficiently enhance the binder thermo-rheological properties in a broad temperature interval. As revealed by thermogravimetric and chemical analysis, benefits above may derive from new structures, probably formed by the interaction between ammonium thiocyanate and bitumen most polar fraction. Thus, flexural DMTA and dynamic shear tests demonstrated an improvement in the binder flexibility and an increase in its elasticity, at low and medium/high in-service temperatures, respectively. In addition, this research emphasizes the use of isothermal frequency sweep tests (and frequency/temperature-dependence conversion) as a means of achieving glass transition temperature values which, in contrast to isochronal temperature sweep tests, do not depend on the selected heating rate.

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“…Furthermore, maintaining the condition of elasticity of the binder, which allows release tension by strain without reaching break, is essential. However, the organic compound of the binder affects its rheology over time due to aging (Thenoux et al, 1998;Lu & Isacsson, 2002;Read & Whiteoak, 2003;Lesueur, 2009). The stiffness is the main consequence of aging (Thenoux et al, 1998;Lu & Isacsson, 2002;Lesueur, 2009), increasing the potential cracking of the asphalt mixture and decreasing the durability of the pavement (Calabi-Floody & Thenoux, 2012).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

Vidal

Calabi-Floody

Sánchez-Alonso

2017

rdlc

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This study aims to assess the durability of asphalt mixtures through their performance versus damage by aging and water sensibility, depending on the physical properties of aggregates. Twelve types of asphalt mixtures were analyzed, using 3 types of aggregates (different shape and mineralogy), and 4 types of asphalt binders (2 conventional, 1 high modulus and 1 modified). The characterization of the aggregates is carried out following the protocol proposed by Zingg and the particle index (PI) according to ASTM-D3398. Both parameters have been correlated with the performance of the aggregate in the mixture. The performance of the mixtures is analyzed by the parameters of FENIX test, such as peak tensile load, stiffness rate and deformation capacity in 3 aging conditions and under wet conditions. The water sensitivity was also evaluated according to the UNE-EN12697-12. The results show that the physical characterization of the aggregates through Zingg method is not enough to predict the behavior of the mixtures studied because it considers only the coarse fraction. In turn, the results show that the angularity and surface texture of the fine fraction aggregates, analyzed through the PI parameter, has a significant effect on the performance versus moisture damage and aging of the asphalt mixtures tested.Key words: Aggregates, physical properties, durability, asphalt mixtures, aging, moisture. ResumenEste estudio propone evaluar la durabilidad de mezclas asfálticas respecto de su desempeño frente al daño por envejecimiento y susceptibilidad al agua, en función de las propiedades físicas de los áridos. Se evaluaron 12 mezclas asfálticas, empleando 3 tipos de áridos (diferente forma y mineralogía), y 4 tipos de asfaltos (2 convencionales, 1 de alto módulo y 1 modificado con polímeros). La caracterización de los áridos se realiza siguiendo el protocolo propuesto por Zingg y de acuerdo al Índice de Partícula (PI) según el protocolo ASTM-D3398, parámetros que han sido correlacionados con el desempeño del árido en la mezcla. La evaluación del desempeño de las mezclas se hace a través del ensayo FENIX analizando parámetros como la carga máxima a tracción, el índice de rigidez y la capacidad de deformación; en 3 condiciones de envejecimiento y un tratamiento de inmersión. Se analizó también la sensibilidad al agua según la norma UNE-EN12697-12. Los resultados muestran que la caracterización física de los áridos por el método Zingg no es suficiente para predecir el comportamiento de las mezclas estudiadas, ya que considera sólo la fracción gruesa. A su vez, este estudio se observó que la angularidad y textura superficial de la fracción fina de los áridos, analizada a través del parámetro PI, tiene un efecto importante en el desempeño frente al daño por humedad y al envejecimiento de las mezclas evaluadas.

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The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification

Cited by 1,303 publications

References 192 publications

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

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

Enhancing the viscoelastic properties of bituminous binders via thiourea-modification

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

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