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Assessment of construction waste aggregates as a road raw material using response surface methods
Vishal Dhiman1, Swasti Sharma1, Preetha Ravisree1
1Amity School of Architecture and Planning, Amity University, Mohali, Punjab, India.
Concrete waste aggregates (CWAs) can be effectively reused in Indian road construction. Bitumen emulsion pre-treatment enhances CWA performance in asphalt wearing courses, promoting sustainable pavement development and reducing environmental concerns.
Area of Science:
- Civil Engineering
- Materials Science
- Environmental Engineering
Background:
- Rapid road network expansion in India generates substantial concrete waste aggregates (CWAs).
- Current disposal methods for CWAs lead to significant environmental concerns and landfill burden.
- Innovative reuse technologies for CWAs are crucial for sustainable construction.
Purpose of the Study:
- To investigate the feasibility of using bitumen emulsion pre-treated CWAs in asphalt wearing course (WC) construction.
- To optimize the mix design for CWAs-based asphalt using Response Surface Methodology (RSM).
- To evaluate the performance and durability of asphalt mixtures incorporating treated CWAs.
Main Methods:
- Utilized Response Surface Methodology (RSM) to optimize experimental variables: bitumen content (VG30), pre-treated CWA percentage, and temperature.
- Experimentally analyzed Marshall Stability, moisture resistance, stiffness, and volumetric properties of asphalt mixtures.
- Compared performance characteristics with MoRTH (Ministry of Road Transport and Highways) specifications.
Main Results:
- Bitumen emulsion treatment significantly improved the engineering performance and durability of CWAs-based asphalt mixtures.
- Optimized conditions (4.79% bitumen, 21.02% pre-treated CWAs, 9.9°C) met all permissible limits for WC construction.
- All tested performance parameters satisfied MoRTH specifications for wearing course materials.
Conclusions:
- Treated CWAs can be effectively reused in road construction in India, offering a sustainable alternative.
- The integration of CWAs, bitumen emulsion treatment, and RSM optimization presents a novel approach for sustainable pavements.
- This reuse strategy reduces environmental impacts from CWA disposal and promotes eco-friendly construction practices.
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