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How does concrete resist bugholes?
Concrete bugholes, small surface voids or pits, are a common defect that can compromise aesthetics and durability. Concrete resists bugholes through proper mix design, placement, and finishing techniques.
Key Factors Preventing Bugholes:
1. Optimal Mix Design: A well-balanced concrete mix with the right water-cement ratio and fine aggregates reduces trapped air. Admixtures like air-entraining agents help control bubble formation.
2. Proper Vibration: Adequate vibration during pouring eliminates air pockets by consolidating the mixture, ensuring a dense structure.
3. Formwork Preparation: Smooth, clean forms coated with release agents minimize surface adhesion, preventing air entrapment.
4. Controlled Placement: Pouring concrete in layers and avoiding excessive height drops reduces air inclusion.
5. Finishing Techniques: Timely floating and troweling close surface pores, while overworking should be avoided to prevent reopening voids.
By addressing these factors, contractors achieve smoother, more durable concrete surfaces free from bugholes.
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