Air entrainment is the intentional creation of tiny air bubbles in concrete. Meaning of entrainment. Watch Queue Queue. In regions where temperatures can frequently fluctuate near freezing, freeze-and-thaw cycles pose one of the greatest challenges to concrete durability. Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. : the incorporation in concrete or mortar of minute air bubbles (as by addition of soap or grease) to increase resilience and resistance to wear and weathering. In engineering, entrainment is the entrapment of one substance by another substance. in avalanche dynamics] Schneeaufnahme {f}meteo. relative to a spatially averaged mean velocity. All air voids in concrete are not created equal. This finish is optional and produces a hard, smooth surface. Related terms: Air Entrainment; Binders; Compressive Strength; Water/Cement Ratio 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. This increases the resistance of the concrete to freeze-thaw damage in cold climates.… Watch Queue Queue The failure of reinforced concrete is most often due to this cycle, which is accelerated by moisture reaching the reinforcing steel. 2. The mean kinetic energy, turbulent kinetic energy, potential energy and total energy were quantified with and without the void fraction being accounted for. Entrain definition is - to draw along with or after oneself. This video is unavailable. 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 … Mean air content . Substantive können mit einem Artikel (Geschlechtswort) und i. Look it up now! Air entrainment — how it happens, how to avoid it. The small, entrained air bubbles serve as reservoirs or expansion chambers to relieve these pressures. The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates subject to freeze-thaw; the secondary purpose is to increase workability of the concrete while in a plastic state in concrete. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. 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. Air entrainment, the intentional creation of tiny air bubbles in concrete Brainwave entrainment, the practice of entraining one's brainwaves to a desired frequency Entrainment (biomusicology), the synchronization of organisms to an external rhythm entrainment noun [U] (CARRYING) the process of making something part of a liquid or flow of something and carrying it along: Increased areas of open water are expected to improve aeration of lake water … a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. A type of concrete which has microscopic bubbles in it is called Air Entrained Concrete. mean kinetic energy, turbulent kinetic energy, potential energy and total energy were quantified with and without the void fraction being accounted for. The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). 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. 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 entraining admixture is usually introduced when it is desired to increase concrete workability without affecting much reduction in compressive strength. What does entrained mean? It also helps improve the workability of concrete. 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. For air bubble entrainment in hydraulics, see, Learn how and when to remove this template message, https://en.wikipedia.org/w/index.php?title=Air_entrainment&oldid=997690737, Articles needing additional references from May 2009, All articles needing additional references, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 January 2021, at 19:34. These are larger bubbles, and are typically less evenly distributed than entrained air. The air entrainment in a free surface mainly results from the development of small turbulent structures in the air-water free surface, which have the capacity to trap air carrying it to the core of the flow. 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. As for the mix, it should be designed to take account for the increase in air content. Air Entrainment. 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). This needs to be taken into account when batching and mixing. Air improves the durability of concrete in environments that are subject to freezing, thawing, salts, ground water, and alkali reactivity. Definition of entrainment in the Definitions.net dictionary. Water beyond that is surplus and is used to make the plastic concrete more workable or easily flowing or less viscous . 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. Air-entrained concrete definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Fluid or Air Entrainment. of water for every 100 lbs. It also is applied in the process of delivering aerosol treatments with medications. 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. 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). air entrainment Luftporenbildung {f} entrainment boundary Mitreißgrenze {f}tech. A. im Singular (Einzahl) und Plural (Mehrzahl) auftreten. In fresh concrete, the air bubbles reduce the water demand of the concrete and make the mix stickier, which helps to reduce segregation and reduces bleeding when air content is around 3%. For example: The entrapment of liquid droplets or solid particulates in a flowing gas, as with smoke. A water to cement ratio (w/c) of approximately 0.38 (this means 38 lbs. Other articles where Air-entraining cement is discussed: cement: Types of portland cement: 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. Air entrainment is responsible for conferring extra plasticity to concrete mixtures. Find out the difference between beneficial air entrainment and accidental, or detrimental, air entrapment.. By Claude Goguen, P.E., LEED AP. How to use entrain in a sentence. Without room for this expansion, large forces develop that can rupture the surface causing what is commonly called surface scaling. Entrain definition is - to draw along with or after oneself. The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. Air entraining agents added to the concrete preferentially attach to the activated carbon, and so they are no longer available to properly entrain air and provide concrete with freeze/thaw protection. These intentionally entrained air bubbles are extremely small. ; The entrapment of gas bubbles or solid particulates in a flowing liquid, as with aeration. The air bubbles typically have a diameter of 10 to 500 micrometres (0.0004 to 0.02 in) and are closely spaced. Environmental water can later fill these voids. Entrapped air is considered to not make a positive contribution to durability and is undesirable though not entirely avoidable. Steel expands when it rusts, and these forces create even more cracks, letting in more water. Das Substantiv Englische Grammatik. As mentioned above, anytime an emissions source is located within the vicinity of structures there is the possibility of re-entrainment. To be effective, bubbles must be spaced not more then .01 inches apart throughout the cement paste. The mixing of air currents. While in segregation, the heavier materials settle down in the concrete matrix. The bubbles contribute to workability by acting as a sort of lubricant for all the aggregates and large particles in a concrete mix. Using today's methods of entraining air, it is not difficult to obtain this bubble spacing. Lernen Sie die Übersetzung für 'entrainment' in LEOs Englisch ⇔ Deutsch Wörterbuch. 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). Air entrainment, or free-surface aeration, is defined as the entrainment/entrapment of un-dissolved air bubbles and air pockets that are carried away within the flowing fluid. (See also oxygen therapy.) 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. Ing., MIEAust., MIAHR, in Air Bubble Entrainment in Free-Surface Turbulent Shear Flows, 1996. Simple past tense and past participle of entrain. Venturi mask: [ ven-tu´re ] a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. Air-entraining admixtures are one part of the solution that will prevent damage from freeze-thaw conditions. It also is applied in the process of delivering aerosol treatments with medications. Air-entraining admixtures facilitate the development of a stable air-void system within concrete that increases the durability of the concrete. 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. anything of immense size and power. Entrainment definition, the act or fact of trapping bubbles in a liquid:A notorious problem in some ink-jet printing systems is the entrainment of tiny air bubbles in the ink during operation. 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. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. Air-entrained concrete is made by adding a detergent (an air-entraining admixture) to stabilize air bubbles trapped during mixing. 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. Hubert Chanson M.E., ENSHM Grenoble, INSTN (Saclay), Ph.D. 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. Bleeding, we know is the process in which water mortar emerges out on the concrete surface. Define air-entrained concrete. Air-entrained concrete is ordinary concrete that contains controlled amounts of air in the form of microscopic bubbles. Hard troweling is a process by which a finisher uses a steel trowel to densify the surface of the concrete. Air flows in and around a convective cloud. Air entrainment is the intentional creation of tiny air bubbles in concrete. A model is developed to predict the location and rate of air entrainment as part of a standard mould filling simulation. This would imply that the dry, unsaturated, environmental air would be entrained throughout the cloud before it would start to evaporate the cloud droplets. 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. These tiny air pockets relieve internal pressure on the concrete by creating chambers for … It is reported that, maximum flexural strength can be achieved even with air contant of 4%. Results show near 60% and 40% overestimates of the kinetic energy and the potential energy if the void fraction is not considered. Consequently, there has been encouraging demand for wind turbine gear oil on the back of the substantial replacement rate of gear oil. the transfer of air from the surrounding atmosphere into an organized air current:During a hurricane the temperatures in the upper atmosphere depend partly on the entrainment of drier or cooler air from outside the vortex. Air entrainment has now been an accepted fact in … For every 1% of additional air entrained, concrete strength will fall by around 5%. TAKE THE QUIZ TO FIND OUT During the concrete making process, some air entrain admixtures are added in the concrete which forms air bubbles in it. This is especially important when designing infrastructure for municipal water and wastewater transport, such as … During freeze-thaw cycles, the water occupying those pores expands and creates stresses which lead to tiny cracks. of cement) is required for all the cement particles to hydrate. Research has shown that the spacing and size of air bubbles are important in assuring their proper action. In addition to entrained air, hardened concrete also contains entrapped air. Air-Entraining Agent. Air-entrained concrete contains billions of microscopic air cells per cubic foot. Meteorology. 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. Air-entrained concrete contains billions of microscopic air cells per cubic foot. Continuous separation is accomplished by air entrainment, buoyancy and interior baffling." ‘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 entraining was introduced in the 1930s and most modern concrete, especially if subjected to freezing temperatures, is air-entrained. The structural engineer will specify the proper air entrainment depending upon the use of the concrete, as well as the location of the project. How to use entrain in a sentence. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. air entrainment … (verb) Entrain definition: to board or put aboard a train | Meaning, pronunciation, translations and examples Air entrainment during mould filling is major source of oxide inclusions in metal castings. They range in size from a few thousandths of an inch in diameter to a few hundredths. The air supply can be a few times higher than estimated by the formulas, which is partially attributable to the intensive air entrainment and the overlapping and collisions of defragmented water columns in the enclosed conduit. 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. Definition (amerikanisch) air, entrainment: Thesaurus, Synonyme, Antonyme air, entrainment: Etymology air: die Luftmitführung. 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 method of forming a small tiny bubble in the concrete is known as Air entrainment. power or ability to act or to influence people, events, decisions, etc. ‘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.’ 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. The air bubbles formed in the fresh concrete act as a fluid, increasing its workability and allowing them to slide better with less friction. They range in size from a few thousandths of an inch in diameter to a few hundredths. See entrainment for other types.. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). Definition of Air Entrainment in Construction. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. Entrain definition: to board or put aboard a train | Meaning, pronunciation, translations and examples The entrapped air is defined as the voids present in the concrete mix due to insufficient compaction. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. Using the Entrainment Ratio to Meet the Patient’s Needs The air:O2 entrainment ratio calculation is useful in determining if the flow set on these devices is sufficient to meet the patient’s needs. Information and translations of entrainment in the most comprehensive dictionary definitions resource on the web. 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