The chemical composition of catalytic air blown asphalt

Quddus, Muhammad Abdul; Sarwar, S. N.; Khan, Fasihullah

doi:10.1016/0016-2361(95)91103-6

Cited by 15 publications

(11 citation statements)

References 12 publications

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“…Observations were made from RAP of the wearing course mixtures of various ages, compositions, and service history in the cold climate environment. In the worst case scenario, concentration of iron chloride was 0.55%wt of bitumen, a level similar to those established to facilitate strong catalytic oxidation in laboratory [5]. Unlike in conditions during in plant air blowing, the FeCl 3 is expected to be present in hydrated form.…”

Section: Introductionmentioning

confidence: 99%

“…This material transformation has been correlated with the rheological changes [5][6][7][8][9][10][11], commonly referred to as stiffening of bitumen. The common explanation behind the bitumen oxidation reaction is that the uptake of oxygen into the bitumen results in increased polarity of the molecules, which is witnessed by the increasing signal in the carbonyl and sulfoxide characteristic regions in the infrared spectra [6].…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of bitumen with air in the presence of catalysts was studied by Quddus et al [5] in the context of the air blowing of the bitumen. The authors observed that iron chloride (FeCl 3 ) expressed significantly higher catalytic activity than other metal chlorides (zinc, cobalt, tin, chromium, and copper) at levels of 0.3%wt.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that the interaction between bitumen and air over mineral aggregate surfaces [14] or inorganic salts [5] can affect the chemical composition of the product of such reaction.…”

Section: Introductionmentioning

confidence: 99%

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The oxidation of bitumen witnessed in-situ by infrared spectroscopy

2017

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During the production and recycling of asphalt concrete, bitumen in contact with inorganic particles is exposed to air at high temperatures. As a result an oxidation of bitumen, also known as aging, occurs. The reaction between bitumen and air at 163°C was studied insitu with and without the presence of inorganic impurities by means of fourier transform infrared spectroscopy in the attenuated reflectance mode. This oxidation was discovered to be a step-wise reaction facilitated by the oxidation of thiols and creation of peroxides within the system. The rate of reaction was demonstrated to depend on the type of impurity present, of which iron (III) chloride was the strongest catalyst. It was further demonstrated that the oxidation reaction is inhibited by the adsorption of thiol species present in the system on copper particles. Combining copper with the iron (III) chloride-containing system also resulted in the inhibition of signal increase in the sulfoxide region of the spectra. The results of this preliminary research on the bitumen oxidation reaction presented are proposed for further research regarding control of aging of asphalt concrete, especially during the recycling works.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The oxidation of bitumen witnessed in-situ by infrared spectroscopy

2017

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“…ambient air, pressure oxygen vessel (POV), thin film (TF), forced air, etc. ), and the physicochemical history and phase of the sample [17,32,33]. Thus, at low temperature in ambient air, surface or chemisorption reactions may predominate, though diffusion of oxygen into the amorphous solid is feasible but may be less extensive than for instance with POV and TF oxidations.…”

mentioning

confidence: 99%

99/02454 The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

1999

Fuel and Energy Abstracts

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The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F and pulsed field gradient spin-echo proton n.m.r. spectra Desando, Michael A.; Lahajnar, Gojmir; Ripmeester, John A.; Zupancic, Ivan AbstractCarbon-13 and fluorine-19 nuclear magnetic resonance spectra of chemically derivatized, by phase transfer methylation and trifluoroacetylation, Athabasca oil sand asphaltene, reveal a broad site distribution of different types of hydroxyl-containing functional groups, viz., carboxylic acids, phenols, and alcohols. The low temperature air oxidation of asphaltene, at ca. 130ЊC for 3 days, generates a few additional carboxyl and phenolic groups. These results are consistent with a mechanism in which diaryl methylene and ether moieties react with oxygen. Self-diffusion coefficients, from the pulsed field gradient spin-echo proton magnetic resonance technique, suggest that low temperature oxidation does not appreciably alter the average particle size and diffusion properties of asphaltene in deuterochloroform. ᭧

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