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

  2. Concrete - Wikipedia

  3. Cement’s basic molecular structure finally decoded - MIT News

  4. Concrete Structure - SpringerLink

  5. Concrete Structures - SpringerLink

  6. Mechanics and Design of Concrete Structures - MIT OpenCourseWare

  7. Concrete Structure - an overview | ScienceDirect Topics

  8. Basic Principles of Concrete Structures | SpringerLink