This finish is optional and produces a hard, smooth surface. What does entrainment mean? Air-entrained concrete contains billions of microscopic air cells per cubic foot. 'All Intensive Purposes' or 'All Intents and Purposes'? However, even when concrete is properly air-entrained, certain types of coarse aggregates can cause distress. Can you spell these 10 commonly misspelled words? Air entraining admixture is usually introduced when it is desired to increase concrete workability without affecting much reduction in compressive strength. power or ability to act or to influence people, events, decisions, etc. Test Your Knowledge - and learn some interesting things along the way. 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. Other uses of air-entrained concrete include sulfate resistance, resistance to alkali-silica reactivity, and improved workability. The structural engineer will specify the proper air entrainment depending upon the use of the concrete, as well as the location of the project. 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. 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. Accessed 7 Jan. 2021. How to use entrain in a sentence. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. The air entrained concrete has a whipped cream effect that allows slump reduction. (See also oxygen therapy.) a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. Concrete containing these tiny air bubbles have been proven far more resistant to freezing and thawing than plain concrete. ‘The many sophisticated experiments to study its physiology, entrainment, and the molecular mechanisms of feedback loops that exist in bacteria, as well as the clock-controlled genes are explored in detail.’ ‘A cement mix consists of Portland cement, aggregates, water, and air entrainment.’ Air entrainment has now been an accepted fact in … anything of immense size and power. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. It flies at the same speed as the wind gusts. 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. Post the Definition of air entrainment to Facebook, Share the Definition of air entrainment on Twitter, Words From 1921: 100 Years Old and Still Around, The Difference Between 'Libel' and 'Liable'. Please tell us where you read or heard it (including the quote, if possible). Air entrainment is the intentional creation of tiny air bubbles in concrete. Air entrainment in hardened concrete reduces permeability and enhances the resistance to surface deterioration caused by de-icing chemicals. Entrainment is the mixing of environmental air into a preexisting air current or cloud so that the environmental air becomes part of the current or cloud. It is typically used to refer to the capture of a wind flow of high moisture content, or in the case of tropical cyclones, the capture of drier air. 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. What made you want to look up air entrainment? Meaning of entrainment. Entrained air modifies the rheology of concrete and its durability to freezing and thawing cycles. It also is applied in the process of delivering aerosol treatments with medications. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). Air can be entrained in concre t e by either of two methods: the use of air entraining agents or of air en-t r aining cements. But one often-overlooked drawback is the increased probability of air entrainment for systems that incorporate smaller reservoirs. Fluid or Air Entrainment. But, what is air entrainment? Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. 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. Depending on the mix, finish timing, etc., the pockets could … These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. A high velocity flow occurring downstream of the gate causes air entrainment, resulting in subatmospheric air pressure in the conduit. Learn a new word every day. This is a basic example of entrainment in nature. Delivered to your inbox! It would be harder for the leaf to move faster or slower than the wind so it "entrains" to the speed of the wind and let's the wind I personally have been conducting my own back yard testing for … ... the capture of drier air. More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. Air entrainment is the intentional creation of tiny air bubbles in 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 ) . 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). With 1 per cent of air, the loss of strength is approximately 5 per cent Thunderstorm asthma epidemics may be triggered by grass pollen rupture in the atmosphere and the entrainment of respirable-sized … TAKE THE QUIZ TO FIND OUT The method of forming a small tiny bubble in the concrete is known as Air entrainment. the raising or rising of a body in air by supernatural means. 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). Air-entrainment is an accepted method of ensuring durability of concrete in a cold environment, with regard to both internal distress and external damage from salt scaling (see also Chapter 9). 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. With air entrainment, the bleed water in the concrete is inhibited more from coming to the surface and thus you run the risk of various degrees of air pockets formed just beneath the surface. Definition of entrainment in the Definitions.net dictionary. 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. 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. This evaluation is especially Air-entraining admixtures are one part of the solution that will prevent damage from freeze-thaw conditions. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! (Civil Engineering) a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. Air-entraining admixtures facilitate the development of a stable air-void system within concrete that increases the durability of the 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. Entrainment is when a fluid picks up and drags another fluid or a solid. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). McGraw-Hill Dictionary of Architecture and Construction. As for the mix, it should be designed to take account for the increase in air content. Affecting much reduction in compressive strength the entrainment of air entrainment is the possibility of re-entrainment above. Is dependent on such factors as aggregate size and freeze-thaw exposure a basic example of entrainment in nature it be. 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