What Does Concrete Consist of, and Why is Stone and Sand Needed?

Concrete is the most widely used construction material, consisting of:

– Cement

– Water

– Sand

– Stone

When mixed together and a chemical reaction occurs, concrete gradually hardens and becomes a strong structure.

**The Role of Stone and Sand in Concrete**

– **Stone:** Helps bear compressive force, increases concrete strength

– **Sand:** Fills gaps between stones, makes structure denser, reduces cement usage

**The Importance of Material Quality**

– Must be clean

– No contaminants

– Appropriate size