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Experimental Study and Analysis on Workability and Mechanical Performance of High Fluidity Recycled Concrete
1School of Architecture and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China.
Materials (Basel, Switzerland)
|September 9, 2022
Summary
This study explored high fluidity recycled concrete, finding that up to 40% recycled aggregate content with a sand ratio of 0.37-0.40 yields C60 concrete. This mix meets fluidity and strength requirements for practical engineering applications.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Recycled aggregate (RA) use in concrete is crucial for sustainable construction.
- Optimizing RA content is key to balancing workability and mechanical properties.
- High fluidity concrete demands specific mix designs for performance.
Purpose of the Study:
- To investigate the impact of recycled aggregate content and sand ratio on high fluidity recycled concrete.
- To determine optimal mix proportions for achieving desired workability and mechanical strength.
- To assess the feasibility of using high fluidity recycled concrete in practical engineering.
Main Methods:
- Prepared concrete mixes with varying recycled aggregate content (20-60%) and sand ratios (0.37-0.40).
- Conducted parallel tests to evaluate workability (slump) and mechanical performance (compressive, tensile, flexural strength).
- Analyzed the relationship between mix proportions, fluidity, and strength indicators.
Main Results:
- Slump reached 120 mm with <30% RA, meeting high fluidity ordinary concrete standards.
- Increased sand ratio enhanced concrete fluidity.
- Optimal sand ratio for fluidity did not align with peak strength.
- C60 concrete was achievable with 0.37-0.40 sand ratio and ≤40% RA.
Conclusions:
- Recycled aggregate content up to 40% is viable for high fluidity concrete.
- Specific sand ratios (0.37-0.40) combined with controlled RA content ensure C60 grade.
- The developed high fluidity recycled concrete meets design specifications for practical engineering use.
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