What is the main purpose of using fly ash as a partial replacement for cement?

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Q: What is the main purpose of using fly ash as a partial replacement for cement?

Solution: Fly ash is used as a partial replacement for cement to enhance durability and reduce permeability in concrete.

Steps: 6

Step 1: Understand what fly ash is. Fly ash is a byproduct from burning coal in power plants.
Step 2: Learn what cement does in concrete. Cement helps bind the materials together to form a strong structure.
Step 3: Know that fly ash can be mixed with cement. Instead of using only cement, we can use some fly ash too.
Step 4: Discover the benefits of using fly ash. It helps make concrete stronger and more durable.
Step 5: Realize that using fly ash can also reduce the amount of water that can seep through concrete, making it less permeable.
Step 6: Conclude that the main purpose of using fly ash is to improve the quality of concrete while using less cement.