A New Green Rejuvenator: Evaluation of Structural Changes of Aged and Recycled Bitumens by Means of Rheology and NMR

Rossi, Cesare Oliviero; Caputo, Paolino; Loise, Valeria; Ashimova, Saltanat; Teltayev, Bagdat; Sangiorgi, Cesare

doi:10.1007/978-3-030-00476-7_28

Cited by 23 publications

(16 citation statements)

References 9 publications

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“…The stronger intermolecular interactions present in RTFOT-aged samples cause also a higher activation energy, which is the energy barrier at the molecular level that must be overcome by the gyratory press for the flow to occur. Interestingly, it can be noticed that the ratio between the activation energies for the neat bitumen/filler and RTFOT-aged bitumen/filler (which are usually indicated as the basic mixtures undergoing compaction with the mineral aggregates so that the rheological properties are usually referred to these [63,64]), is 97.3/83 = 1.17 ± 0.03 which is recurrently within the range of experimental uncertainty as the same number was arrived at previously.…”

Section: Volumetric Analysis By Gyratory Compactorsupporting

confidence: 80%

Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects

et al. 2020

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For asphalt concrete preparation in laboratory mix-design operations, bitumens are usually mixed with micrometer-sized particles (filler), sand and centimeter-sized crushed stones in a gyratory press at a temperature of about 140–155 °C depending on the bitumen viscosity, until adequate homogenization and compaction take place (air voids optimum). This requires energy consumption. To minimize it, the process needs to be optimized and is usually made empirically. The aim of this manuscript is to gain a comprehension of the physico-chemical mechanisms involved in the process by exploring: (i) the rheological properties (viscosity, activation energy) of a neat and RTFOT-aged bitumen, in presence and in absence of a filler, (ii) the volumetric and resistance behavior under the compaction in a standard Gyratory Compactor (GC) of their blends with aggregates and (iii) the mechanical properties (Indirect Tensile Strength, compression and tensile deformation) of the final products. Correlations between activation energy and pre-exponential factor of the viscosity on a side, and between viscosity, workability and final mechanical properties on the other side allowed to provide a rational interpretation of the physico-chemical processes involved in the framework of the physics of complex fluids. The scientific clues will be of help in optimizing the workability in asphalt concretes productions with obvious repercussions in terms of energy savings, useful for economic and environmental issues.

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Section: Volumetric Analysis By Gyratory Compactorsupporting

confidence: 80%

Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects

et al. 2020

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“…It has sometimes been assumed that once the chemistry of bitumen is known we will be able to predict its performance as a construction material, however, the knowledge of the chemical composition is also a limited help for understanding bitumen and some of the advanced analytical are not easily translated to physical properties. For this purpose, in continuation of the authors' former paper [15][16][17], aimed at an interdisciplinary study on the fundamental differences between paving-grade and industrially-used bitumens. The authors believe that the outcomes of this study could provide new insights into the characteristics of these two major categories of bitumens.…”

Section: Problem Statement and Objectivesmentioning

confidence: 99%

Advanced Characterization of Bituminous Binders: Comparing Industrial and Paving-Grade Bituminous Binders

Eskandarsefat

Caputo

Rossi

et al. 2021

Eurasian Chem. Tech. J.

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This paper deals with the fundamental differences between industrial and paving-grade bituminous binders. The paper is presented in two main sections: 1) a review of the materials’ colloidal structure and the required properties for the industrial and paving applications; 2) a wide range of experimental tests with which the bituminous binders were studied and compared. In this research, a 160/220 industrial bitumen was studied and compared to a paving-grade bitumen with the same penetration and with a lower penetration, 70/100 one. The research consisted of physical, chemical, thermal, microstructural, and rheological analysis to provide a comprehensive understanding of these bituminous binders of diverse applications. Overall, the comparison of the tests’ results indicated that while the asphaltene content and its characteristics have a great influence on the bitumen’s properties, it is not the only fundamental factor. During the study of the chemical structures via Atomic Force Microscopy (AFM), it was found that the Peri phase (attributed to the resins) also plays an important role, defining the bitumen’s physical visco-elastic properties. In fact, from a microstructural point of view using AFM a significant difference was notified between the industrial bitumen and the paving-grade ones. These differences allow the paving-grade bitumens to be more elastic and ductile compared to the industrial bitumen.

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“…The content of individual compounds in oil, % wt. In order to reveal the correlation dependence of the component composition of the investigated oil with its fragmentary composition, the study of the treated EH by the action of hydrocarbons was carried out by the method of NMR spectroscopy [10][11][12]. To determine the fragment composition of oil by the method of NMR spectroscopy, the 1 H and 13 C spectra of hydrocarbons were subdivided into a number of ranges of chemical shifts corresponding to different molecular fragments according to those adopted in [13].…”

Section: Tablementioning

confidence: 99%

Investigation of Electrohydraulic Effect on Physicochemical Characteristics of High-Resinous Oil “Karazhanbas”

Salakhov¹,

Seitzhanova²,

Bodykov³

et al. 2020

Eurasian Chem. Tech. J.

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In order to change the viscosity of high-resinous oil of the “Karazhanbas” field (Kazakhstan), the effect of electrohydraulic action on it was studied. The effect of adding an organic solvent xylene on the rheological properties of oil is investigated. A comparative study of the hydrocarbon composition of oil before and after electrohydraulic impact was carried out by the method of gas chromatographymass spectrometry. Fragment composition of oil hydrocarbons before and after electrohydraulic treatment was determined by 1H and 13C NMR spectroscopy. It is shown that the conversion of heavy oil fractions to light ones begins with a five-time electrohydraulic impact. It is determined that 20‒25 electric discharge pulses are sufficient for the quantitative process of splitting hydrocarbons. It was found that the addition of xylene to high-viscosity oil leads to an increase in the conversion of hydrocarbons under electrohydraulic action. The content of paraffins and naphthalenes in high-viscosity oil is slightly reduced during electrohydraulic processing. In oil, after electrohydraulic action, a decrease in the proportion of protons of long alkyl terminal СН3-groups of hydrocarbons is observed, which indicates the process of decomposition of heavy oil fractions into light fractions.

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A New Green Rejuvenator: Evaluation of Structural Changes of Aged and Recycled Bitumens by Means of Rheology and NMR

Cited by 23 publications

References 9 publications

Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects

Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects

Advanced Characterization of Bituminous Binders: Comparing Industrial and Paving-Grade Bituminous Binders

Investigation of Electrohydraulic Effect on Physicochemical Characteristics of High-Resinous Oil “Karazhanbas”

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