Here is a goal: How to Add Calcium to a Concrete Mix

Which way makes more sense to accomplish this goal?

OPTIONS:
i. Dissolve calcium into water prior to mixing with concrete. Agitate the water to help the calcium flakes to dissolve. Mix concrete together as per normal using calcium enriched water..
ii. Dissolve plaster of paris into water prior to mixing with concrete. Agitate the water to help the plaster of paris to dissolve. Mix concrete together as per normal using calcium enriched water..
i.