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Effect of Surface Active Agent (SAA) on 50/70 Bitumen Foaming Characteristics
Mateusz M Iwański1, Anna Chomicz-Kowalska2, Krzysztof Maciejewski2
1Department of Building Engineering Technologies and Organization, Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel, Switzerland)
|November 14, 2019
Summary
Adding a surface active agent (SAA) to 50/70 bitumen improves its properties for half-warm asphalt (HWA) mixes. The optimal rate of 0.6% SAA significantly enhances bitumen characteristics and foaming performance.
Area of Science:
- Materials Science
- Civil Engineering
- Bituminous Materials
Background:
- Standard properties of half-warm asphalt (HWA) mixes depend on optimal bitumen characteristics.
- Modifying bitumen before foaming can enhance its properties for HWA production.
Purpose of the Study:
- To investigate the effect of surface active agent (SAA) modification on 50/70 penetration bitumen.
- To determine the optimal SAA content for improved bitumen properties and foaming characteristics.
- To evaluate the impact of SAA on bitumen's physical and rheological properties, as well as foaming parameters.
Main Methods:
- Modification of 50/70 penetration bitumen with varying SAA concentrations (0.2%, 0.4%, 0.6% by weight).
- Assessment of modified bitumen properties: penetration, softening point, Fraass breaking point, and dynamic viscosity at 60°C, 90°C, and 135°C.
- Evaluation of foaming characteristics: expansion ratio (ER), half-life (HL), and foam index (FI), along with determining optimal foaming water content.
Main Results:
- Statistical analysis indicated that 0.6% SAA yielded the most favorable outcomes.
- SAA modification significantly influenced bitumen's penetration, softening point, and Fraass breaking point.
- Foaming parameters (ER, HL, FI) were positively affected by SAA addition, with 0.6% showing the best performance.
Conclusions:
- The addition of 0.6% surface active agent is optimal for modifying 50/70 bitumen used in half-warm asphalt mixes.
- SAA modification enhances both the standard physical properties and the foaming characteristics of bitumen.
- Optimized bitumen properties through SAA modification contribute to improved HWA mix performance.
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