The primary benefit of entrained air in hardened concrete however is the resistance it offers to freeze-thaw damage and scaling caused by de-icing salts or chemicals. Definition of entrainment in English English dictionary Any of several processes in which a solid or liquid is put into motion by a fluid . Information and translations of entrainment in the most comprehensive dictionary definitions resource on the web. The water content for an air-entrained mix will be 3 to 5 gallons per cubic yard less than for a non-air-entrained mix having the same slump. The air bubbles are created during mixing of the plastic (easy flowing, not hardened) concrete, and most of them survive to be part of the hardened concrete. amount of air entraining agent, type and gradation of aggre g a t e , hard-ness of water, length and means of mixing, brand of cement, and con-c r ete tempera t u re ) . Though hardened concrete appears solid, it is actually highly porous, having small capillaries resulting from the evaporation of water beyond that required for the hydration reaction. See more. air entrainment Luftporenbildung {f} entrainment boundary Mitreißgrenze {f}tech. The failure of reinforced concrete is most often due to this cycle, which is accelerated by moisture reaching the reinforcing steel. The former in-clude such products as natura l False Claims Act meets air entrainment Additionally, the main sources of oil contamination in wind turbines include solid particles, moisture, and entrained air . Air entrained or air bubble generating agents are intentionally incurred in the concrete mix which large produce air bubble in the entire mass of concrete. Look it up now! The bubbles contribute to workability by acting as a sort of lubricant for all the aggregates and large particles in a concrete mix. A. im Singular (Einzahl) und Plural (Mehrzahl) auftreten. Some common questions about air-entrained concrete are: does air entrainment reduce strength; does it affect the proportions of a concrete mixture; and can it be used in mild climates. This needs to be taken into account when batching and mixing. Definition of Air Entrainment in Construction. Most concrete has a w/c of 0.45 to 0.60, which means there is substantial excess water that will not react with cement. The mixing of air currents. Bernoulli's Priniciple or Effect has practical applications in the field of respiratory care in that it allows us to deliver precise oxygen concentration levels with simple devices by mixing oxygen with entrained room air. The total flow increases, but the proportion of gases and the ratio stay the same, meaning then that the FIO 2 also remains the same. Fire gases can be moved and pushed by air from a hose stream, known as “air entrainment.” It’s important to note that fog streams have more … Definition of entrainment in the Definitions.net dictionary. Using today's methods of entraining air, it is not difficult to obtain this bubble spacing. n a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. This is critical because the re-entrainment evaluation looks at onsite impacts where exhaust air can be pulled back into a building (e.g., at fresh air intake units), typically located on the sides or roofs of buildings. Meteorology. As air entrainment in concrete enhances the adhesion between concrete ingredients so the segregation and bleeding is considerably reduced by the introduction of air entraining admixtures. The importance of entrained air was first noticed during the 1930s, when certain highway sections were found to be more immune to the effects of freezing and thawing than others. Towards the end of the gate movement, the position of the resulting hydraulic jump is relatively stable. 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). Other uses of air-entrained concrete include sulfate resistance, resistance to alkali-silica reactivity, and improved workability. These intentionally entrained air bubbles are extremely small. A model is developed to predict the location and rate of air entrainment as part of a standard mould filling simulation. It also is applied in the process of delivering aerosol treatments with medications. It is reported that, maximum flexural strength can be achieved even with air contant of 4%. This would imply that the dry, unsaturated, environmental air would be entrained throughout the cloud before it would start to evaporate the cloud droplets. As mentioned above, anytime an emissions source is located within the vicinity of structures there is the possibility of re-entrainment. Air entrainment is the intentional creation of tiny air bubbles in concrete.The bubbles are introduced into the concrete by the addition to the mix of an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents). The air entrainment model offers the option to include buoyancy and bulking in the output, meaning that areas of variable density flows can be accurately represented. a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. In regions where temperatures can frequently fluctuate near freezing, freeze-and-thaw cycles pose one of the greatest challenges to concrete durability. 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