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Updated: Aug 9, 2025
12:21
Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
Published on: January 6, 2023
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Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction
M K Diptikanta Rout1, Surya Kant Sahdeo2, Sabyasachi Biswas3
1Department of Civil Engineering, National Institute of Technology, Jamshedpur 831014, India.
Materials (Basel, Switzerland)
|February 25, 2023
Summary
Reclaimed asphalt pavement (RAP) aggregates can replace natural aggregates in concrete. Washed RAP (WRAP) with zirconia silica fume (ZSF) shows promise for sustainable pavement construction, meeting strength standards.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Natural aggregate scarcity drives research into recycled materials for pavement construction.
- Reclaimed Asphalt Pavement (RAP) offers a sustainable alternative to virgin aggregates.
- Optimizing RAP use in concrete requires understanding its impact on mechanical properties.
Purpose of the Study:
- To characterize Reclaimed Asphalt Pavement (RAP) aggregates for optimized concrete mix proportions.
- To evaluate the performance of concrete incorporating RAP as a partial replacement for natural aggregates (NA).
- To investigate the combined effect of RAP and zirconia silica fume (ZSF) on concrete strength.
Main Methods:
- RAP aggregates were used to replace NA at percentages ranging from 0-100%.
- Zirconia silica fume (ZSF) partially replaced Ordinary Portland Cement (OPC) in the concrete mix.
- Compressive strength, flexural strength, and split tensile strength were experimentally determined.
Main Results:
- Washed RAP (WRAP) incorporation slightly reduced concrete compressive strength (2.7-37.35%) compared to control mixes.
- WRAP-based concrete exhibited superior strength over dirty RAP (DRAP) concrete at 7, 28, and 56 days.
- A mix of 40% WRAP aggregates and 10% ZSF outperformed DRAP aggregates and met pavement strength standards.
Conclusions:
- The study demonstrates the viability of using WRAP and ZSF in concrete for pavement applications.
- Optimized proportions of WRAP and ZSF contribute to sustainable construction practices.
- Reclaimed Asphalt Concrete Pavements (RACP) present a long-term solution to environmental and economic challenges in construction.
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