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Characterisation of Asphalt Concrete Using Nanoindentation
Salim Barbhuiya1, Benjamin Caracciolo2
1Department of Civil Engineering, Curtin University, Perth 6845, Australia. salim.barbhuiya@curtin.edu.au.
Materials (Basel, Switzerland)
|August 5, 2017
Summary
This study used nanoindentation to analyze asphalt concrete nanomechanics. Hydrated lime additive significantly improved the resistance to deformation, hardness, and stiffness, especially in the mastic phase.
Area of Science:
- Materials Science
- Civil Engineering
- Nanotechnology
Background:
- Asphalt concrete performance is critical for road infrastructure.
- Understanding nanomechanical properties of asphalt components is essential for material design.
- Additives like hydrated lime can potentially enhance asphalt properties.
Purpose of the Study:
- To investigate the nanomechanical properties of asphalt concrete phases (mastic, matrix, aggregate).
- To evaluate the effect of hydrated lime as an additive on these properties.
- To determine the specific phase most influenced by hydrated lime.
Main Methods:
- Nanoindentation testing was employed to measure load-displacement behavior.
- Nanomechanical properties including hardness and stiffness were extracted.
- Comparative analysis was performed on asphalt concrete with and without hydrated lime.
Main Results:
- Hydrated lime significantly enhanced resistance to deformation in mastic and matrix phases.
- The mastic phase showed the most pronounced improvement in properties.
- Hardness and stiffness were notably increased in the mastic phase due to hydrated lime.
Conclusions:
- Hydrated lime is an effective additive for improving asphalt concrete nanomechanical performance.
- The mastic phase is particularly responsive to hydrated lime modification.
- Findings provide insights for optimizing asphalt concrete formulations for enhanced durability.
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