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Potential Additives in Natural Rubber-Modified Bitumen: A Review.
Nurul Farhana Rohayzi1,2, Herda Yati Binti Katman1,2, Mohd Rasdan Ibrahim3
1Department of Civil Engineering, College of Engineering, Universiti Tenaga Nasional, Putrajaya Campus, Jalan Ikram-Uniten, Kajang 43000, Malaysia.
Polymers
|April 28, 2023
Summary
This study assesses additives for natural rubber-modified bitumen in road construction. Additives generally enhance bitumen properties, improving road durability against heavy loads and weather variations.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Science
Background:
- Conventional bitumen pavements face deterioration due to increasing loads and weather variations.
- Bitumen modification is crucial for enhancing road construction material performance.
- Cup lump natural rubber (CLNR) is emerging as a key modifier in rubber-producing nations.
Purpose of the Study:
- To assess various additives for modifying natural rubber-bitumen.
- To review how additives improve bitumen properties for road construction.
- To determine optimal additive amounts and application methods for CLNR-modified bitumen.
Main Methods:
- Literature review of additives including polyphosphoric acid, Evotherm, mangosteen powder, trimethyl-quinoline, and sulphur.
- Discussion of xylene and toluene for ensuring rubberised bitumen homogeneity.
- Analysis of physical and rheological properties of modified bitumen.
Main Results:
- Additives generally enhance the properties of conventional bitumen.
- Specific additives improve performance metrics relevant to road durability.
- Optimal additive concentrations and application techniques are identified.
Conclusions:
- Additives significantly improve the performance of natural rubber-modified bitumen.
- Further research into CLNR is recommended due to limited existing studies.
- Optimized modified bitumen offers a sustainable solution for modern road infrastructure.
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