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

  2. Concrete - Wikipedia

  3. Structural Concrete - Wiley Online Library

  4. Microstructure of Concrete - IntechOpen

  5. Mechanics and Design of Concrete Structures - MIT OpenCourseWare

  6. Mechanics and Design of Concrete Structures - MIT OpenCourseWare

  7. Concrete Structures - SpringerLink

  8. Concrete Structure - SpringerLink

  9. How are properties of concrete in the structure measured?