|What advantages are offered by Fly ash concrete in comparison to concrete made with only cement?|
|1. It saves water.|
|2. It lowers heat of hydration.|
|3. It reduces the corrosion of steel.|
|4. The concrete quickly becomes strong.|
|Select the correct answer using the codes given below.|
A) 1 and 4
B) 2 and 3
C) 2, 3 and 4
D) All of these
Correct Answer: D
Solution :[d] Although, Fly ash offers environmental advantages, it also improves the performance and quality of concrete. Fly ash affects the plastic properties of concrete by improving workability, reducing water demand, reducing segregation and bleeding, and lowering heat of hydration. Fly ash increases strength, reduces permeability, reduces corrosion of reinforcing steel, increases sulphate resistance and reduces alkali-aggregate reaction. Fly ash reaches its maximum strength more slowly than concrete made with only Portland cement.
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