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  1. Concrete | Definition, Composition, Uses, Types, & Facts | Britannica

  2. Structural Concrete - Wiley Online Library

  3. Concrete - Wikipedia

  4. Concrete Structure - SpringerLink

  5. Concrete Structures - SpringerLink

  6. Microstructure of Concrete - IntechOpen

  7. Basic Principles of Concrete Structures | SpringerLink

  8. What is Concrete? Composition & Types of Concrete - Civil …