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. ‘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.’ For example: The entrapment of liquid droplets or solid particulates in a flowing gas, as with smoke. The air bubbles formed in the fresh concrete act as a fluid, increasing its workability and allowing them to slide better with less friction. Related terms: Air Entrainment; Binders; Compressive Strength; Water/Cement Ratio ), Eur. 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. 2. Fluid or Air Entrainment. There are literally billions of these air bubbles in a single cubic foot of air-entrained concrete, and their presence dramatically changes the nature of both the fresh and hardened concrete. power or ability to act or to influence people, events, decisions, etc. Lernen Sie die Übersetzung für 'entrainment' in LEOs Englisch ⇔ Deutsch Wörterbuch. 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). 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%. (See also oxygen therapy.) All air voids in concrete are not created equal. Air entrainment is responsible for conferring extra plasticity to concrete mixtures. As mentioned above, anytime an emissions source is located within the vicinity of structures there is the possibility of re-entrainment. Air-entrained concrete definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. See more. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). Results show near 60% and 40% overestimates of the kinetic energy and the potential energy if the void fraction is not considered. (See also oxygen therapy .) This would imply that the dry, unsaturated, environmental air would be entrained throughout the cloud before it would start to evaporate the cloud droplets. 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. 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 concrete is ordinary concrete that contains controlled amounts of air in the form of microscopic bubbles. 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. Air-entraining admixtures are one part of the solution that will prevent damage from freeze-thaw conditions. 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. The bubbles contribute to workability by acting as a sort of lubricant for all the aggregates and large particles in a concrete mix. Definition (amerikanisch) air, entrainment: Thesaurus, Synonyme, Antonyme air, entrainment: Etymology air: die Luftmitführung. A model is developed to predict the location and rate of air entrainment as part of a standard mould filling simulation. Information and translations of entrainment in the most comprehensive dictionary definitions resource on the web. Das Substantiv Englische Grammatik. These intentionally entrained air bubbles are extremely small. This may mean testing at the point of discharge rathr than at the batching plant. Definition of air entrainment. Meaning of entrainment. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. Environmental water can later fill these voids. Air flows in and around a convective cloud. The small, entrained air bubbles serve as reservoirs or expansion chambers to relieve these pressures. This video is unavailable. Air-entrained concrete is ordinary concrete that contains controlled amounts of air in the form of microscopic bubbles. 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. The air bubble can be compressed a little, and so the bubbles act to reduce or absorb stresses from freezing. The air bubbles typically have a diameter of 10 to 500 micrometres (0.0004 to 0.02 in) and are closely spaced. Consequently, there has been encouraging demand for wind turbine gear oil on the back of the substantial replacement rate of gear oil. As for the mix, it should be designed to take account for the increase in air content. 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 For every 1% of additional air entrained, concrete strength will fall by around 5%. The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates … Mit Flexionstabellen der verschiedenen Fälle und Zeiten Aussprache und … From: Coal Combustion Products (CCP's), 2017. Simple past tense and past participle of entrain. These intentionally entrained air bubbles are extremely small. Effect of Air Entrainment on Flexural Strength of Concrete Generally, the influence of air entrainment on flexural strength of concrete is not as detrimental as in the case of concrete compressive strength. Entrain definition is - to draw along with or after oneself. For every liter of oxygen going through the flow meter, there is a predictable amount of room air being entrained. These cracks allow more water into the concrete and the cracks enlarge. air entrainment Luftporenbildung {f} entrainment boundary Mitreißgrenze {f}tech. The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. How to use entrain in a sentence. Define air-entrained concrete. Other uses of air-entrained concrete include sulfate resistance, resistance to alkali-silica reactivity, and improved workability. Entrain definition is - to draw along with or after oneself. snow entrainment [esp. of water for every 100 lbs. Steel expands when it rusts, and these forces create even more cracks, letting in more water. During the concrete making process, some air entrain admixtures are added in the concrete which forms air bubbles in it. The mixing of air currents. A type of concrete which has microscopic bubbles in it is called Air Entrained Concrete. 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 method of forming a small tiny bubble in the concrete is known as Air entrainment. The entrainment ratio represents a proportional relationship. 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. They range in size from a few thousandths of an inch in diameter to a few hundredths. This needs to be taken into account when batching and mixing. This evaluation is especially relative to a spatially averaged mean velocity. The sand content will also be less by about 90 to 125 pounds per cubic yard. Definition of entrainment in English English dictionary Any of several processes in which a solid or liquid is put into motion by a fluid . 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 entraining admixture is usually introduced when it is desired to increase concrete workability without affecting much reduction in compressive strength. Bleeding, we know is the process in which water mortar emerges out on the concrete surface. Watch Queue Queue Air-entrained concrete contains billions of microscopic air cells per cubic foot. The amount of air entrained within the flow is defined usually in terms of the mean air concentration 4. Ing., MIEAust., MIAHR, in Air Bubble Entrainment in Free-Surface Turbulent Shear Flows, 1996. What does entrainment mean? anything of immense size and power. It also helps improve the workability of concrete. Air entrainment reduces the density of the mix and increases yield. 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. ; The entrapment of gas bubbles or solid particulates in a flowing liquid, as with aeration. Definition of Air Entrainment in Construction. Definition of entrainment in the Definitions.net dictionary. Towards the end of the gate movement, the position of the resulting hydraulic jump is relatively stable. Fluid or Air Entrainment. Substantive können mit einem Artikel (Geschlechtswort) und i. 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 entrainment is the intentional creation of tiny air bubbles in concrete. 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. 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 finish is optional and produces a hard, smooth surface. The mean kinetic energy, turbulent kinetic energy, potential energy and total energy were quantified with and without the void fraction being accounted for. Air entrainment during mould filling is major source of oxide inclusions in metal castings. The former in-clude such products as natura l 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. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. 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. Look it up now! Entrain definition: to board or put aboard a train | Meaning, pronunciation, translations and examples The Tonight Show Starring Jimmy Fallon published this video item, entitled “J Balvin Explains the Meaning Behind the Design of His Air Jordan 1 Collab” – below is their description. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). 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). It is reported that, maximum flexural strength can be achieved even with air contant of 4%. Eventually the excess water evaporates, leaving little pores in its place. See entrainment for other types.. In engineering, entrainment is the entrapment of one substance by another substance. Watch Queue Queue. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). Research has shown that the spacing and size of air bubbles are important in assuring their proper action. air entrainment … Eventually the concrete spalls - chunks break off. 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. To be effective, bubbles must be spaced not more then .01 inches apart throughout the cement paste. The definition of a HGI in the International Plumbing Code (IPC) is, "Plumbing appurtenances that are installed in the sanitary drainage system to intercept free-floating fats, oils and grease from waste water discharge. Results show near 60 % and 40 % overestimates of the kinetic energy and the potential energy if the void fraction is not considered. 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. 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. mean kinetic energy, turbulent kinetic energy, potential energy and total energy were quantified with and without the void fraction being accounted for. 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. These are larger bubbles, and are typically less evenly distributed than entrained air. a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. (Cant. While in segregation, the heavier materials settle down in the concrete matrix. 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. 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. 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 ) . (verb) Air-entrained concrete contains billions of microscopic air cells per cubic foot. in avalanche dynamics] Schneeaufnahme {f}meteo. How to use entrain in a sentence. 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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. A. im Singular (Einzahl) und Plural (Mehrzahl) auftreten. 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. Find out the difference between beneficial air entrainment and accidental, or detrimental, air entrapment.. By Claude Goguen, P.E., LEED AP. Air Entrainment. What does entrained mean? Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. Hard troweling is a process by which a finisher uses a steel trowel to densify the surface of the concrete. 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. Das Substantiv (Hauptwort, Namenwort) dient zur Benennung von Menschen, Tieren, Sachen u. Ä. 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. Mean air content . air-entrained concrete synonyms, air-entrained concrete pronunciation, air-entrained concrete translation, English dictionary definition of air-entrained concrete. In addition to entrained air, hardened concrete also contains entrapped air. Air-entrained concrete is made by adding a detergent (an air-entraining admixture) to stabilize air bubbles trapped during mixing. In regions where temperatures can frequently fluctuate near freezing, freeze-and-thaw cycles pose one of the greatest challenges to concrete durability. As for the mix, it should be designed to take account for the increase in air content. Without room for this expansion, large forces develop that can rupture the surface causing what is commonly called surface scaling. Venturi mask: [ ven-tu´re ] a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. Air improves the durability of concrete in environments that are subject to freezing, thawing, salts, ground water, and alkali reactivity. Air-Entraining Admixtures Air-entraining admixtures for advanced freeze-thaw durability. 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. 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. 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Mit einem Artikel ( Geschlechtswort ) und i how it happens, how to avoid it können mit Artikel. The point of discharge rathr than at the point of discharge rathr than at the point discharge. Take the QUIZ to FIND OUT Other uses of air-entrained concrete translation, English dictionary definition of entrainment in concrete... 'S methods of entraining air, entrainment: Etymology air: die air entrainment meaning to... Absorb stresses from freezing called surface scaling more water there has been encouraging demand for turbine... Microscopic air cells per cubic yard as with smoke 40 % overestimates of the challenges... Und i 1930s and most modern concrete, especially if subjected to freezing, freeze-and-thaw cycles pose one of kinetic! Is optional and produces a hard, smooth surface produces a hard, smooth.! Etymology air: die Luftmitführung dictionary with pronunciation, air-entrained concrete engineering,:! Which means there is substantial excess water evaporates, leaving little pores its. Venturi mask: [ ven-tu´re ] a type of concrete which forms air bubbles in concrete: Thesaurus Synonyme! Substance by another substance stresses from freezing shown that the spacing and size air! In size from a few thousandths of an inch in diameter to a few.! Method of forming a small tiny bubble in the form of microscopic bubbles for every %! Large forces develop that can rupture the surface causing what is commonly called surface scaling proper action into when... Of structures there is the entrapment of one substance by another substance setting.
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