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Why is concrete used for dams and other large construction projects?
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Cement
The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.
Concrete is widely used for dams and large-scale construction projects primarily because of its exceptional compressive strength and its ability to be poured into virtually any form while in a liquid state.12
In the context of dams, concrete is particularly valued for its ability to resist the massive horizontal thrust of retained water through its own weight. When used in such massive quantities, engineers take advantage of its structural properties while managing specific challenges:3
- Massive Scale: For large structures like dams, the concrete mix can incorporate coarse aggregates as large as 150 mm (6 inches) to reduce the total volume of cement required.4
- Heat Management: Because cement releases heat during the hardening process (hydration), large masses can reach temperatures significantly higher than the surrounding environment, leading to potential cracking upon cooling. To mitigate this, engineers use techniques such as casting in distinct "lifts," utilizing low-heat cement blends, or circulating cool water through pipes embedded within the structure.56
- Durability: Concrete is a water- and fire-resistant solid, making it ideal for infrastructure that must withstand environmental exposure.12
While concrete is weak in tensile strength, its versatility allows it to be combined with steel reinforcement or prestressing techniques to handle complex structural stresses in modern engineering.512