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Enhancing sustainability in self-compacting concrete by optimizing blended supplementary cementitious materials
Abdul Aziz1, Syed Saqib Mehboob2, Aisha Tayyab3
1Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan.
Scientific Reports
|May 29, 2024
Summary
This study optimizes self-compacting concrete (SCC) by replacing cement with Metakaolin (MK) and Limestone Powder (LP). Optimal performance is achieved with 40-55% cement replacement, balancing workability, mechanical strength, and sustainability.
Area of Science:
- Concrete Engineering
- Materials Science
- Sustainable Development
Background:
- Self-compacting concrete (SCC) offers improved workability but faces challenges in reducing cement content without compromising structural integrity.
- Global trends advocate for using waste materials and supplementary cementitious materials (SCMs) in concrete to enhance sustainability.
- Integrating SCMs aligns with United Nations' Sustainable Development Goals (SDGs) by reducing environmental impact.
Purpose of the Study:
- To investigate the optimal combination of Metakaolin (MK) and Limestone Powder (LP) as partial cement substitutes in SCC.
- To evaluate the effects of MK and LP on the rheological and mechanical properties of SCC.
- To determine the ideal cement replacement level for sustainable and structurally sound SCC.
Main Methods:
- Response Surface Method (RSM) was employed to systematically explore ingredient ratios.
- An orthogonal array of 16 mixes was analyzed, varying mixture and process parameters.
- Rheological properties were assessed using slump flow, L-box, and sieve segregation tests.
- Mechanical strength was evaluated through compressive strength tests at 7 and 28 days.
Main Results:
- Higher concentrations of MK negatively impacted workability and hardened properties.
- RSM analysis indicated an optimal cement replacement range of 40% to 55% for SCC.
- The study identified a balance between rheological performance, mechanical strength, and sustainability.
Conclusions:
- Partial cement replacement with Metakaolin and Limestone Powder is a viable strategy for sustainable SCC.
- The optimal cement replacement range of 40-55% ensures both engineering requirements and environmental benefits.
- This research contributes to developing eco-friendly and high-performance concrete practices.
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