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Dive into the research topics where Natalia Afanasjeva is active.

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Featured researches published by Natalia Afanasjeva.


Road Materials and Pavement Design | 2013

Thermal properties and chemical composition of bituminous materials exposed to accelerated ageing

J. Puello; Natalia Afanasjeva; Mario Alvarez

Three aged and unaged asphalts and their corresponding asphaltenes and maltenes were characterised by means of thermal analysis and fractionation. Rolling thin film oven test and pressure ageing vessel procedures were followed to simulate thermo-oxidative ageing conditions. The temperatures associated with the glass transition region of aged and unaged samples were determined by modulated differential scanning calorimetry (MDSC), and the temperatures related to the thermal degradation process were determined by thermogravimetry (TG). Fractional composition of asphalts was determined by Corbetts fractionation procedure. It was found that the temperatures related to the glass transition region are higher for aged asphalts, while thermal degradation shows similar patterns between the studied samples. Fractional composition had an evolution with ageing. The results show that thermal analysis can be used to identify the type of asphalt being studied; MDSC can be used to identify the ageing degree of an asphalt, based on the changes of glass transition properties, unlike the results obtained with TG and DTG (derivative thermogravimetric) analysis.


Fuel | 2008

Asphalt rheology evolution through thermo-oxidation (aging) in a rheo-reactor

X.A. Vargas; Natalia Afanasjeva; M. Álvarez; P.H. Marchal; L. Choplin


ITECKNE: Innovación e Investigación en Ingeniería | 2009

Técnicas instrumentales para la evaluación delenvejecimiento en los asfaltos

Juliana Puello Méndez; Natalia Afanasjeva


Ingenieria Quimica | 2009

Rheological properties of asphalts and their changes during accelerated aging

J. Puello; Mario Alvarez; Natalia Afanasjeva


Dyna | 2008

EVOLUCIÓN DEL COMPORTAMIENTO VISCOELÁSTICO DEL ASFALTO INDUCIDA BAJO TERMO-OXIDACIÓN IN SITU EN UN REO-REACTOR

Xiomara Vargas; Natalia Afanasjeva; Mario Alvarez; Philippe Marchal; Lionel Choplin


6th Eurasphalt & Eurobitume Congress | 2016

Zero shear viscosity from oscillation tests on aged and non-aged bitumens

J. Puello; Natalia Afanasjeva; Mario Alvarez


Temas Agrarios | 2015

Desarrollo de poliuretanos con capacidad de retención de boro fiodisponible

Manuel Palencia; Natalia Afanasjeva; Erika Benavidez


Ingeniería y competitividad: revista científica y tecnológica | 2015

Electrodeposición de vanadio y níquel de los asfaltenos de crudos pesados

Natalia Afanasjeva; William H. Lizcano-Valbuena; Nayeli Aristizabal; Ivone Mañozca


Ingeniería y competitividad | 2015

V and Ni electrochemical deposition from asphaltenes in heavy oils

Natalia Afanasjeva; William H. Lizcano-Valbuena; Nayeli Aristizabal; Ivone Mañozca


Revista Ion | 2014

Conversão pirolíticos dos concentrados resino-asfaltenicos de os crudes pesados

Natalia Afanasjeva

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Philippe Marchal

École Normale Supérieure

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Lionel Choplin

Centre national de la recherche scientifique

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