Relation between NMR parameters and service characteristics of asphalts: The role of structural ordering

Kashaev, R. S.; Кемалов, А. Ф.; Diyarov, I. N.; Фахрутдинов, Р З

doi:10.1007/bf02694155

Cited by 2 publications

(4 citation statements)

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“…The procedures originally proposed by Hasan et al and by Siddiqui and Ali to characterize asphalts have been used practically unmodified since their original publications, despite advances in NMR as analytical technique and the improvements in the technologies and methods to characterize such materials. ,,,− In this work, both NMR spectra of the same sample (P1, P2 or P3), were processed from its FID, according to indications of Avella and Fierro , and the other two methods. Results were compared correspondently (Tables and ).…”

Section: Results and Discussionmentioning

confidence: 99%

Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR

2016

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An improved methodology for the structural characterization of heavy fractions of petroleum by hydrogen-1 and carbon-13 nuclear magnetic resonance was applied to three fresh and unfractionated asphalts in solution. The results were compared with those generated by two other known characterization methods applied to the same NMR spectra. The comparison revealed inconsistencies in the traditional methods for the structural characterization of this type of materials. The improved methodology can be applied to unfractionated samples, and it provides a more detailed structural characterization of the asphalts than previously obtained. The new method provides a better correlation between physicochemical properties and the chemical structure of the complex mixtures of hydrocarbons.

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Section: Results and Discussionmentioning

confidence: 99%

Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR

2016

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“…The condensation of asphaltenes was determined by the ratio of the optical densities D 1600 /(D 820 + D 880 ), on this basis, the more unsubstituted CH bonds, the less aromatic structures are condensed and vice versa. Using the data of pulsed NMR of the initial states of oil systems [2,8,9,10], they allow us to put forward the prerequisites for the physicochemical and thermodynamic activity of the oil dispersed system (ODS) with the change in their dispersed composition [2,4,6,12] i.e. in the case of HOR processing, by the activation of maltenes with polymer additives or various fillers.…”

Section: Methodsmentioning

confidence: 99%

“…Each of these processes proceeds in time with a certain definite velocity and is characterized by its constant -the spin-spin relaxation time T2 and the spin-lattice relaxation time T1 [2]. The reciprocals of these times are the measure of the corresponding relaxation rate, and T2 > T1 always [2,8,9,10,13]. The structural-dynamic states of HOR under various temperature regimes were studied as an original raw material of the oxidation process.…”

Section: Methodsmentioning

confidence: 99%

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Scientific and Practical Aspects of Bitumen Emulsion Mastic Creation

Кемалов¹,

Kemalov²,

Adiko³

et al. 2018

IJET

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It is interesting to consider the possible application as an alternative raw material in the manufacture of bituminous emulsion material residual bitumen grade BNN 80/120, production technology which implies a significant reduction in the proportion of paraffinic hydrocarbons by allocating them in the oil fractions in the evacuation of heavy petroleum residues. As a raw material in the production of BEM they should use the bitumen obtained from the heavy oils of naphthenic aromatic base with a minimum content (up to 2% by weight) [1] of high-molecular straight-chain paraffinic hydrocarbons (P-HC), whose reserves are largely limited and difficult to access. In this regard, the expansion of the raw material base of bitumen production due to the involvement of HOR resinous paraffin base confirms the relevance of the studies. The difficulties in the production of insulating BEMs, that meet the requirements of GOST 30693-2000 on the basis of oxidized HOR paraffin base, are explained by the fact that protective coatings (PK) from such materials with the decrease in the glass transition temperature (point) are characterized by an increased intensity of internal stress (δv) in the volume of BEM, in which the increase of the strength growth intensity (δp) occurs, so premature spontaneous destruction occurs in the process of oxidative destruction, i.e. in the conditions of their operation. This is explained by the fact that at the temperatures above Tst, highly elastic and plastic deformations develop in bitumen, and internal stresses relax easily. With decreasing Tst, the rigidity of bitumen increases sharply, the relaxation processes decelerate, and internal stresses increase substantially.

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Relation between NMR parameters and service characteristics of asphalts: The role of structural ordering

Cited by 2 publications

References 1 publication

Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR

Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR

Scientific and Practical Aspects of Bitumen Emulsion Mastic Creation

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Relation between NMR parameters and service characteristics of asphalts: The role of structural ordering

Cited by 2 publications

References 1 publication

Structural Characterization of Unfractionated Asphalts by1H NMR and13C NMR

Structural Characterization of Unfractionated Asphalts by1H NMR and13C NMR

Scientific and Practical Aspects of Bitumen Emulsion Mastic Creation

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Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR

Structural Characterization of Unfractionated Asphalts by¹H NMR and¹³C NMR