What are Accelerators and what are they used for?
Accelerators reduce the set time of fresh concrete and speed up the early strength gain of hardening concrete. Many accelerators include water reducing agents to produce faster setting concrete with reduced water content in cold or freezing weather.

      a. Chloride- This has corrosive properties and is not used when rebar or other metals are used.
      b. Non-Chloride- This has non-corrosive properties and can be used in the presence of metals in the concrete.

What are Admixtures (Water-Reducing)
These are used to increase the Slump without adding water. Using less water increases the strength of the concrete.

Why add "Air" to a concrete mix?
Air- Entraining agent is used to develop millions of tiny air bubbles in concrete. Entrained Air improves concretes freeze-thaw durability. It is used for concrete that is exposed to water and freezing temperatures.