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The Structure of Bitumen: Conceptual Models and Experimental Evidences.
Michele Porto1, Ruggero Angelico2, Paolino Caputo1
1Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, Cubo 14/D, 87036 Arcavacata di Rende, CS, Italy.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
This review explores models describing bitumen's complex microstructure, focusing on experimental evidence and the colloidal state. It highlights the aggregation properties of asphaltenes in various systems.
Area of Science:
- Materials Science
- Petroleum Engineering
- Colloid Science
Background:
- Bitumen, a petroleum by-product, is a key binder in road pavements and construction.
- It comprises complex hydrocarbons (SARA fractions: saturates, aromatics, resins, asphaltenes).
- Understanding bitumen's microstructure is crucial for its application and performance.
Purpose of the Study:
- To provide a comprehensive review of modeling efforts for bitumen's microstructure.
- To emphasize experimental evidence and the colloidal state of bitumen.
- To explore the evolution of models concerning asphaltene aggregation.
Main Methods:
- Literature review of existing models and experimental studies.
- Analysis of scattering techniques and computational modeling.
- Focus on experimental validation of microstructural models.
Main Results:
- Several models exist for bitumen's microstructure, with the colloidal model being widely accepted.
- Alternative models offer valid perspectives supported by experimental and theoretical data.
- Experimental evidence supports the colloidal description of bitumen's microstructure.
Conclusions:
- Bitumen microstructure modeling is an evolving field with diverse approaches.
- Experimental data is key to validating and refining these models.
- Further research on asphaltene aggregation properties is essential for a complete understanding.
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