Concrete Admixtures

Retarder

Set-retarders create a more uniform and predicable concrete. Used to slow down the setting time of concrete to allow flexibility in the time of placement and finishing operations. Useful in hot-weather and during prolonged unloading times.

Accelerator

Admixtures that serve to accelerate time of setting and to increase early concrete strengths. Most commonly used in cool winter conditions. Benefits of earlier finishing of slabs, earlier structural use of concrete, less traffic closure time on pavements and quicker stripping and re-use of forming materials. More efficient and faster construction generally realizes cost savings.

Calcium – Chloride

Robust set-accelerator most effective for faster setting times and strength development.

Non – Chloride

Accelerant recommended when embedded steel reinforcement is present. Areas of highly concentrations of chloride ions are noted to induce general corrosion activity in reinforcement steel.

Super Plasticizer — High Range Water Reducer

The recommended practice to achieve higher slumps for workability and ease of placement without the detrimental effects of additional water on concrete strengths. Reducing additional water results in decreased shrinkage and less strength issues. Also, benefits include improved set times, decreased bleed water, and faster rate of strength development at all stages.

Air Entrainment

Air entrainment is essential to produce lasting concrete in climates in which concrete will be exposed to freezing and thawing cycles. These microscopic air cells relieve internal pressure on concrete by providing tiny, ball bearing like chambers for water to expand into when it freezes. Air entrainment in concrete improves workability, pump-ability and permeability.

Corrosion Inhibitor

Used in steel-reinforced, post-tensioned and prestressed concrete that will come in contact with chlorides from deicing salts, soils or a marine environment.