air entraining

Ideally, air entraining agents should only be used in ready to use mortar.

Do not use with air entraining agents.

Air entraining was introduced in the 1930s and most modern concrete, especially if subjected to freezing temperatures, is air-entrained.

Air entraining agents have been the salvation of wet cast concrete as it pertains to its durability.

Mechanical foaming may be carried out in two principal ways by strong air entraining agitation:

Mortar additives (air entraining agents) may improve water retention, but at the same time impair bond strength.

Patented non air entraining, water reducing, water retaining agent.

Air entraining agents reduce compressive strength.

It is a mortar or concrete based material that is normally made to a low density by air entraining or foaming.

Air Entraining Agent; see Foam Index

Air entraining agents add and entrain tiny air bubbles in the concrete, which reduces damage during freeze-thaw cycles, increasing durability.

A concrete maker introduces the bubbles by adding to the mix an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents).

A recognised air entraining agent should be used - this will ensure that the air bubbles are of a consistent size and spread uniformly throughout the mortar or concrete.

The AFIT instrument quantifies the dynamic foaming properties of air entraining agents, surfactants and foaming materials.

As it may not be compatible with some air entraining agents, preliminary tests should be made; and if compatibility is a problem the admixtures should be added separately.

It does not contain water reducers, accelerators, air entraining of surfactant chemicals that might cause undesirable side effects when used in conjunction with admixtures normally used in concrete.

Masonry cement is a proprietary product containing portland cement and an inert mineral filler (limestone) plus additives such as air entraining and wetting agents and water repellents.

Advantages and disadvantages of water repellant and air entraining agents as well as plasticizer admixtures are identified along with the use for compounds and accelerators in masonry mortars and grouts.

Air Entraining Agents Cemairin 3 Flo-Add Provides the combined advantages of air entrainment and plasticisation in concrete, giving improved surface finish, resistance to frost action and increased durability.

Foam Index test is a rapid method to determine the relative levels of Air Entraining Agent (AEA) needed during concrete mixing, with or without mineral additives like combustion fly ash, that control air void volumes within cured concrete.

Also, the dosage of air entraining admixtures for fly ash concrete, to achieve a certain air content, increases with an increasing carbon content in the fly ash used (carbon absorbs organic admixtures such as air entraining agents).