The Role of Polar Species in the Aggregation of Asphaltenes

Maruska, H. Paul; Rao, B. M. L.

doi:10.1080/08843758708915850

Cited by 69 publications

(30 citation statements)

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“…Also, asphaltenes carry permanent electrical charges [70,71] and their dielectric constant lies between 5 and 7 [72,73,74]. The electrical charge is thought to arise as a consequence of the high degree of electron delocalization due to the graphite-like stacking of the molecules, giving an overall negative charge [71,44].…”

Section: Asphaltenesmentioning

confidence: 99%

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

Lesueur¹

2009

Advances in Colloid and Interface Science

1,329

710

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Section: Asphaltenesmentioning

confidence: 99%

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

Lesueur¹

2009

Advances in Colloid and Interface Science

1,329

710

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“…Asphaltene aggregation is still maintained in solvent, where they associate to form the so-called "micelles" [14,[32][33][34][35] whose size is principally determined by the solvent nature, asphaltene content, and temperature [28,29,35]. Asphaltene graphite-like stacking of the molecules has as consequences a high degree of electron delocalization, giving an overall negative charge [27,36] a permanent electrical charge [37], and a dielectric constant between 5 and 7 [38][39][40]. Finally, asphaltene association also has particular effects on the rheological behavior of bitumen [41][42][43].…”

Section: Asphaltenesmentioning

confidence: 99%

Bitumen and Bitumen Modification: A Review on Latest Advances

et al. 2019

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This synthesis explores the state-of-the-knowledge and state-of-the-practice regarding the latest updates on polymer-modified bitumens (PmBs). The information in this study was gathered from a thorough review of the latest papers in the literatures related to modified bituminous materials, technologies, and advances. For this purpose, the paper is presented in two principle sections. In the first part, the bitumen itself is investigated in terms of chemical structure and microstructural systems. In the second part, the paper focuses on bitumen modification from different aspects for assessing the effectiveness of the introduced additives and polymers for enhancing the engineering properties of bitumen in both paving and industrial applications. In conclusion, the knowledge obtained in this study has revealed the importance of the chemical composition of base bitumen for its modification. It can be declared that while some polymers/additives can improve one or some aspects of neat bitumen properties, they can lead to compatibility problems in storage and production. In this respect, several studies showed the effectiveness of waxes for improving the compatibility of polymers with bitumen in addition to some benefits regarding warm mix asphalt (WMA) production.

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“…asphaltenes) in bitumen. The dielectric constant of 5-7 for asphaltenes indicate that these molecules have a somewhat higher total polarizability than bitumen as a whole [22]. Dipole moments up to 7.7 (in Debye) have been reported for asphaltenes by Goual and Firoozabadi [23].…”

Section: Polarizability Of Bitumenmentioning

confidence: 84%

“…that was in the range 1.55 to 1.60. The refractive index of the n-heptane insoluble fraction has been reported to 1.682 [22]. It has been concluded that non-aged bitumen as a whole is highly London dispersive (electronic) polarizable (see Equation 9) and that the asphaltene (or n-heptane insoluble) fraction is even higher London dispersive (electronic) polarizable.…”

Section: London Dispersive Polarizability Ellipsometry Has Recently mentioning

confidence: 99%

Low frequency dielectric spectroscopy of bitumen binders as an indicator of adhesion potential to quartz aggregates using Portland cement

et al. 2015

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The purpose of this investigation was to interpret the bitumen-aggregate adhesion based on the dielectric spectroscopic response of individual material components utilizing their dielectric constants, refractive indices and average tangent of the dielectric loss angle (average loss tangent). Dielectric spectroscopy of bitumen binders at room temperature was performed in the frequency range of 0.01 to 1000 Hz. Dielectric spectroscopy is an experimental method for characterizing the dielectric permittivity of a material as a function of frequency. Adhesion data has been determined using the Rolling bottle method.The results show that the magnitude of the average tangent of the dielectric loss angle (average loss tangent) depends on bitumen type. The average loss tangent in the frequency range 0.01 to 1 Hz is introduced as a potential indicator for predicting polarizability and, thereby, adhesion potential of bitumen binders to quartz aggregates when using Portland cement. In order to obtain acceptable adhesion of 70/100 penetration grade bitumen binders and quartz aggregates when using Portland cement, it is suggested that the binder have an average tan  > 0.035 in the frequency range 0.01 to 1 Hz.

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The Role of Polar Species in the Aggregation of Asphaltenes

Cited by 69 publications

References 0 publications

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

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

Bitumen and Bitumen Modification: A Review on Latest Advances

Low frequency dielectric spectroscopy of bitumen binders as an indicator of adhesion potential to quartz aggregates using Portland cement

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