Air-entraining admixtures entrain micro air bubbles in the concrete primarily to provide enhanced freeze-thaw durability. These air bubbles create micro voids, allowing water space to expand upon freezing without jeopardizing the integrity of the concrete. While some compressive strength loss typically accompanies increased air in concrete, it generally can be overcome by reducing the water-cement ratio via improved workability (due to the air-entraining agent itself) or using other appropriate admixtures.
Efflorescence control admixtures are designed to minimize the white chalky deposition (calcium carbonate) caused by calcium hydroxide released during the hydration process. Krete efflorescence control admixtures offer various performance levels and technologies to control both primary and secondary efflorescence.
Release agents are products that are applied to molds, forms, pallets, or equipment which prevent adhesion of freshly placed concrete to the applied surface. Release agents are generally one of two types, barrier and reactive.
Set or cure accelerators shorten the set time of concrete, allowing for higher green strength, improved cold-weather curing, early removal from wet cast forms, and early surface finishing. Set accelerators work by solvating the calcium ions in cement making them more reactive and available for hydration.
Plasticizers (also commonly referred to as surfactants) are designed to "wet out" the constituents in concrete and improve the workability or flowability of the concrete, resulting in improved densities and productivity, i.e. faster mold or machine fill times.
Super plasticizers, also referred to as water-reducing admixtures, are admixtures that allow water reduction thereby increasing strength and providing greater flowability without substantially slowing set time or increasing air entrainment.
Water repellent admixtures are designed to provide integral water repellency to concrete by affecting the capillary action of water into or out of the concrete. Water diffuses through micro voids and canals, typically found at the cement-aggregate interface. Water repellent admixtures can perform as static pore pluggers, creating a more difficult pathway for water migration, or they can perform as reactive chemicals, forming “insitu” hydrophobic materials that not only plug pores, but also chemically repel water.
Krete offers a line of sundry products including a color enhancing sealer, macro foam control agent, set retarder, flexural strength enhancer, and corrosion-inhibitive rack coating to assist you in these specific product requirements.