The correct answer is: D. Increases strength.
Pozzolanic cement is a type of cement that is made by combining Portland cement with pozzolanic materials. Pozzolans are siliceous or siliceous and aluminous materials that, in themselves, have little or no cementitious value but, in the presence of water, react chemically with calcium hydroxide to form compounds with cementitious properties.
The use of pozzolanic cement can improve the strength, durability, and water resistance of concrete. It can also reduce the heat of hydration and improve the workability of concrete.
Option A is incorrect because pozzolanic cement can actually improve the workability of concrete. This is because pozzolans can react with calcium hydroxide to form compounds that have a lubricating effect on the cement particles.
Option B is incorrect because pozzolanic cement can actually reduce bleeding. This is because pozzolans can absorb water and prevent it from bleeding out of the concrete.
Option C is incorrect because pozzolanic cement can actually reduce shrinkage. This is because pozzolans can react with calcium hydroxide to form compounds that have a filling effect.
In conclusion, the use of pozzolanic cement can improve the strength, durability, and water resistance of concrete. It can also reduce the heat of hydration and improve the workability of concrete.