Using various thermal analytical methods for bitumen characterization
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Using various thermal analytical methods for bitumen characterization Marcela Fiedlerová, Petr Jíša, David Kadlec*, Romana Velvarská, Kamil Štěpánek UniCRE (Unipetrol Centre for Research and Education, Inc.), Areál Chempark 2838, Litvínov-Záluží 1, 436 70, Czech Republic Received 27 June 2019; received in revised form 7 September 2020; accepted 24 September 2020
Abstract
Recently, the modification of bituminous binders is an ongoing trend. However, most current analytical methods are insufficie nt to characterize bitumen. Generally, standardized laboratory techniques are often time and cost consuming. Moreover, they use one-purpose devices requiring a considerable amount of samples and solvents. Therefore, we investigated three special instrumental analytical techniques to find out bitum en properties. Our main objective was to obtain some additional parameters of bituminous binders to allow their more accurate description. The first studied method, thermogravimetric analysis operated especially in a high-resolution mode that can be used as a fingerprint area in spectrometry to determine the bitumen quality. The second one modulated differential scanning calorimetry provided many various important parameters, including temperature of glass transitio n, cold crystallization and serviceability limit state. The third one, the thermomechanical analysis also measured the value of glass-transition temperature for comparison with the method mentioned above. We have found correlations between the results from thermal instrumental techniqu es and standardized laboratory tests. Keywords: Bitumen; Polymer modification; Low critical temperature; Thermal analysis; Glass-transition temperature
1. Introduction The requirement for a high-quality and durable asphalt pavement has generated an increasing demand for polymer-modified bitumen. Various materials are used for bitumen modification, including plastomeric and elastomeric polymers [1,2], reactive polymers [3,4] and waste materials, such as crumb rubber [5]. However, the differences between these materials lead to high variability in the properties of the final bitumen. Traditionally, bitumen has been evaluated by empirical tests, such as the standard (European) methodology [6], which has gradually been supplemented with or replaced by Superpave, the newer methodology evolved in the United States [7]. These empirical methodologies enable the determination of a wide range of bitumen characteristics, including its high/low-temperature properties, fatigue resistance and resistance to ageing. However, they have several drawbacks. For example, Superpave testing of low-temperature properties involves the utilization of a bending
* Corresponding author E-mail addresses: [email protected] (M. Fiedlerová); [email protected] (P. Jíša); [email protected] (D. Kadlec); [email protected] (R. Velvarská). Peer review under responsibility of Chinese Society of Pave
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