cement or an admixture in concrete, for example, an air-entraining agent. A typical example of an air-entraining agent is abietic acid (Fig. These are The laboratory specimen at the left with no entrained air … Generally, these are used in the cold countries where the water freezes rapidly. agglomeration — a gathering into a ball or mass. Air-entrained concrete is produced using air-entraining portland cement, or by the introduction of air-entraining agents, under careful engineering supervision, as the concrete is mixed on the job. Air Entraining Agents – Rheosurf-AE; To request more information, MSDS, quote/sample about this product please click below link. A method of producing an air-entraining agent admixture for use in a cementitious mixture having fly ash, said method comprising: (a) in a mixing vessel, adding to the vessel by weight percent of the admixture a predetermined quantity of water, at a temperature in the range of approximately 140.degree. 13. The former in-clude such products as natura l wood re s i n s , animal or ve g e t a b l e f a t s , wetting agents and water solu-ble soaps of certain acids. Air entraining agents (AEA) are concrete admixtures used to entrain air in concrete when a structure will be exposed to moisture, freeze-thaw cycles and deicing chemicals. HEAD OFFICE : 217, Brunswick Blvd., Pointe-Claire, Quebec H9R 4R7, Canada. 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). Air entrainment — how it happens, how to avoid it. of cementitious materials. Request a Sample. Concrete is a porous material and water moves through these pores. When temperatures drop below freezing, water in concrete begins to freeze and the powerful expansive forces of freezing water can damage the concrete. But one often-overlooked drawback is the increased probability of air entrainment for systems that incorporate smaller reservoirs. The benefits of entraining air in the concrete include increased resistance to freeze-thaw degradation, increased cohesion (resulting in less bleed and segregation) and improved compaction in low-workability mixes. Air entrainment is the intentional creation of tiny air bubbles in concrete. oz./100 lb. aggregate — granular material, such as sand, gravel, crushed stone, crushed hydraulic-cement concrete, or iron blast-furnace slag, used with a cementing The resins derived from pinewood, that is, vinsol resin, and various abietates are more effective in the presence of alkaline-earth and alkali metals such as calcium and sodium, and many admixture combinations are derived by prereacting, say, vinsol resin with caustic soda. 14.6 A). 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