Sika® Multi Air-25
Multi-component Synthetic Air Entrainer
Sika® Multi Air-25 is a multi-component synthetic air entrainer. Sika® Multi Air-25 meets the requirements of ASTM C-260 for air entraining admixtures.
Air entrainment is recognized as the most effective prevention against concrete damage caused by repetitive freeze-thaw cycles. Air entraining agents help to prevent scaling by creating microscopic air voids that water trapped in the concrete can expand into when the concrete freezes. This prevents cracking caused by the natural expansion of ice. Entrained air voids in the concrete will also increase durability in harsh environments where concrete is exposed to deicing salts, marine salts and sulfates. Besides that Air entraining agents also improve workability and placeability of a concrete mixture and reduce bleeding.