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A Workability Characterization of Innovative Rubber Concrete as a Grouting Material
Yi Lu1, Cong Li2, Xiaoyu Zhang1
1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.
Materials (Basel, Switzerland)
|August 12, 2022
Summary
This study introduces innovative rubber concrete for shield tunnel construction, demonstrating that increased rubber and PVA fiber content enhances toughness. Optimal material properties balance strength and flexibility for engineering applications.
Area of Science:
- Materials Science
- Civil Engineering
- Geotechnical Engineering
Background:
- Shield tunnel construction requires specialized grouting materials.
- Traditional materials may lack sufficient toughness for seismic events.
- Innovative composite materials offer potential solutions.
Purpose of the Study:
- To evaluate the workability and physical properties of a novel rubber concrete grouting material.
- To assess the material's performance, particularly its toughness, for shield tunnel applications.
- To determine the influence of rubber and PVA fiber content on material characteristics.
Main Methods:
- Preparation of rubber concrete incorporating porous sand, PVA fiber, cement, and rubber.
- Assessment of physical properties: slurry density, consistency, fluidity, bleeding, shrinkage, setting time.
- Measurement of unconfined compressive strength (UCS) at 3 and 28 days.
- Introduction of a toughness index to evaluate post-failure performance.
Main Results:
- Increased rubber content significantly enhances the toughness index.
- PVA fiber content and length positively correlate with the toughness index.
- Exceeding optimal fiber content (0.8%) or length (6-9 mm) compromises UCS.
- The toughness index increased from 1.0 to 1.7 with 80% rubber content (28 days).
Conclusions:
- Rubber concrete exhibits promising workability and enhanced toughness for shield tunnel grouting.
- Material design requires balancing properties like UCS and toughness.
- Optimized rubber and PVA fiber content is crucial for achieving desired performance characteristics.
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