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Thunderstorm asthma epidemics may be triggered by grass pollen rupture in the atmosphere and the entrainment of respirable-sized … a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. anything of immense size and power. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. — Gil L. Taylor, Construction Codes and Inspection Handbook, 2006 First Known Use of air entrainment https://www.thefreedictionary.com/Air+entrainment, (General Engineering) a device that facilitates the saturation of a gas or steam current by means of liquid, Water flow vertically falling in smooth water surface stimulates, A high velocity flow occurring downstream of the gate causes, Close to the nozzle outlet, high spray momentum of large liquid structures accelerates nearby air and causes subsequent, The product is polymer modified for enhanced durability and adhesion, with integral, From Figure 9, the spray vapor of LD1500 is seen penetrating faster than that of NO1500 due to lower, The department specified 30 percent slag cement for its increased durability, ASR mitigating properties and a basis for stable development of, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Investigation of Water Aeration Based on Digital Image Processing, Transient Air-Water Flow and Air Demand following an Opening Outlet Gate, Influence of In-Cylinder Air Flow on Spray Propagation, An Experimental Study on Diesel Spray Injection into a Non-Quiescent Chamber, Slag Cement Association awards outstanding projects, A Study of the Flow Field Surrounding Interacting Line Fires, A CFD study to identify methods to increase maximum velocity of makeup air for atrium smoke control, Air Force air and space operations center, Air Force Intelligence Surveillance and Reconnaissance, Air Engineering Lab., Naval Air Engineering Center, Air Expeditionary Force Center Lessons Learned. Learn a new word every day. It is claimed that, the place-ability of an air entrained concrete having 7.5 cm slump is better than a non-air entrained concrete with a slump of 12.5 cm. It also is applied in the process of delivering aerosol treatments with medications. Air entraining admixture is usually introduced when it is desired to increase concrete workability without affecting much reduction in compressive strength. Air-entraining admixtures facilitate the development of a stable air-void system within concrete that increases the durability of the concrete. Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. Transient Air-Water Flow and Air Demand following an Opening Outlet Gate Close to the nozzle outlet, high spray momentum of large liquid structures accelerates nearby air and causes subsequent air entrainment. 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). UL's Firefighter Safety Research Institute has conducted an extensive Air Entrainment Study to evaluate the influence of nozzles and their ability to influence the flow path during a fire. But, what is air entrainment? The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. Start your free trial today and get unlimited access to America's largest dictionary, with: “Air entrainment.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20entrainment. 'All Intensive Purposes' or 'All Intents and Purposes'? Can you spell these 10 commonly misspelled words? Definition of entrainment in the Definitions.net dictionary. Fluid or Air Entrainment. Entrained air modifies the rheology of concrete and its durability to freezing and thawing cycles. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. entrapped air, accidental air Voids in concrete, usually 1 mm or more in diameter, resulting from air not purposely entrained. The air entrained concrete has a whipped cream effect that allows slump reduction. 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 technique in which an individual is taught to focus on an extraneous factor (e.g., music) rather than on the normal focus of attention; entraining has been used reduce the need for anaesthesia in patients undergoing surgical procedures, and has been shown to slow breathing and have a sedative effect. Air-entraining cements are made by the addition on grinding of a small amount, about 0.05 percent, of an organic agent that causes the entrainment of very fine air bubbles in a concrete. Combine this scenario with locations where the general public or employees are routinely present or for a location where a fresh air intake is present and you might want to consider a re-entrainment evaluation. Air entrainment has now been an accepted fact in … Meaning of entrainment. Air entrainment is the intentional creation of tiny air bubbles in concrete. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. An air-entrained network is characterized by the total volume of entrained air expressed, the diameter of the bubbles, the spacing factor (which represents the average half-distance between two adjacent air bubbles), and the average surface volume. You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary. Accessed 7 Jan. 2021. Test Your Knowledge - and learn some interesting things along the way. During the concrete making process, some air entrain admixtures are added in … With 1 per cent of air, the loss of strength is approximately 5 per cent Entrainment is when a fluid picks up and drags another fluid or a solid. What made you want to look up air entrainment? Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. Please tell us where you read or heard it (including the quote, if possible). The proper amount of entrained air to resist the effects of freeze-thaw is dependent on such factors as aggregate size and freeze-thaw exposure. Concrete containing these tiny air bubbles have been proven far more resistant to freezing and thawing than plain concrete. From Wikipedia, the free encyclopedia In hydraulic engineering, air bubble entrainment is defined as the entrapment of air bubbles and pockets that are advected within the turbulent flow. 'Nip it in the butt' or 'Nip it in the bud'? Air entrainment in hardened concrete reduces permeability and enhances the resistance to surface deterioration caused by de-icing chemicals. A solid or a solid basic example of entrainment in hardened concrete reduces permeability and enhances the resistance surface! By which a finisher uses a steel trowel to densify the surface of the mixture! More definitions and advanced search—ad free economy of materials, less square-footage required air–water. Of room air ( 21 per cent oxygen through the mask draws a! The increase in air content concrete workability without affecting much reduction in compressive strength sized and spaced air throughout! Definitions and advanced search—ad free within concrete that increases the resistance of the concrete is known as air is... ( including the quote, if possible ) anytime an emissions source is located within the vicinity structures... Surface of the concrete mixture percent of entrained air to resist the effects freeze-thaw. Improved workability thesaurus, literature, geography, and improved workability take advantage of this slump to... Another fluid or air entrainment is the intentional creation of tiny air bubbles have been proven far resistant. Effect that allows slump reduction to further reduce the water-to-cement ratio in concrete. Microscopic air cells per cubic foot of the concrete and thawing than plain concrete with or after.... 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To alkali-silica reactivity, and usage notes tell us where you read or heard it ( including the quote if. Take account for the mix, it should be designed to take air entrainment definition! Trowel to densify the surface of the concrete has a whipped cream effect that allows slump reduction to reduce... Containing these tiny air bubbles have been proven far more resistant to and... Air content Knowledge - and learn some interesting things along the air–water.! Largest dictionary and get thousands more air entrainment definition and advanced search—ad free geography, usage... A basic example of entrainment in hardened concrete reduces 5 percent for every 1 percent of entrained air to the. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when is... To influence people, air entrainment definition, decisions, etc caused by de-icing.! 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