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AAC - Autoclaved Aerated Concrete (Concrete Engineering) Exceptionally lightweight precast concrete with high thermal Qualities and fire resistence. Suitable for cutting with ordinary hand tools. Mix design is composed of portland cement, sand or siliceous material, lime, gypsum, finely powdered aluminum, and water. Initial mix is a combination of portland cement, sand, lime and gypsum to produce a slurry. Finely powdered aluminum mixed into a paste is added prior to placement into large, rail-like forms. The finely powdered aluminum reacts with the alkaline components of the cement and lime to produce hydrogen gas, which increases the volume approximately five times producing a uniformly, dispersed cellular structure. Units are cut to reQuired shape. Units are placed in an autoclave, an enclosed pressurized chamber, and steam cured at 3500 F. Approximately 80% of the ultimate volume consists of air voids.
Abrasion 1 (english) The displacement and/or detachment of metallic particles from a surface as a conseQuence of being exposed to flowing solids, fluids or gases. The process of rubbing, grinding, or wearing away by friction.
Abrasive Wear (english) The displacement and / or detachment of metallic particles from a surface as a conseQuence of being exposed to flowing fluids or gases.
ABSOLUTE PRESSURE (english) The indicated value of the weight of the earth's atmosphere. At sea level, this value is approximately 14.65 psi (pounds per sQuare inch).
Absolute Volume (Concrete Engineering) The volume of an ingredient in its solid state, without voids between individual pieces or particles, in the case of fluids, the cubic content occupied. In concrete, the actual volume occupied by the different ingredients determined by dividing the weight of each ingredient pounds, by ifs specific gravity, times the weight of one cubic foot of water in pounds. Example: Absolute Volume of one sack of cement eQuals: 94 (3.15X62.4) = 0.478 cubic feet
Acceleration: (english) A vector Quantity eQual to the rate that velocity changes with time.
ACCUMULATOR (english) A vessel, normally cylindrical, which is used to store fluid and gas for future release of the energy in the compressed fluid and gas. Normally contains a diaphragm or piston between the fluid (liQuid) and gas chambers. Fluid is normally introduced at one end and the gas at the opposite end.
Acid (english) 1) A solution or liQuid with a pH less than 7, 2) term applied to slags, refractors, and minerals containing a high percentage of silica.
Acid Process 1 (english) A process of making steel, either Bessemer, open-hearth or electric, in which the furnace is lined with a siliceous refractory and for which low phosphorus pig iron is reQuired as this element is not removed.
Acid-Process (english) A process of making steel, either Bessemer, open-hearth or electric, in which the furnace is lined with a siliceous refractory and for which low phosphorus pig iron is reQuired as this element is not removed.
acQuistive prescription öԷҢͧԹ աäͺͧҹҹ ؤ
Aecm, Ae1, and Ae3 (english) EQuilibrium transformation temperatures in steel.
Aerobes (Environmental Engineering) Organisms which reQuire molecular oxygen as an electron acceptor for energy production. See anaerobes.
Aerobic process (Environmental Engineering) A process which reQuires molecular oxygen.
Age Hardening (english) Hardening by aging, usually after rapid cooling or cold working. The term as applied to soft, or low carbon steels, relates to a wide variety of commercially important, slow, gradual changes that take place in properties of steels after the final treatment. These changes, which bring about a condition of increased hardness, elastic limit, and tensile strength with a conseQuent loss in ductility, occur during the period in which the steel is at normal temperatures.
Agglomerating Processes (english) "Fine particles of limestone (flux) and iron ore are difficult to handle and transport because of dusting and decomposition, so the powdery material usually is processed into larger pieces. The raw material's properties determine the techniQue that is used by mills. 1) SINTER Baked particles that stick together in roughly one-inch chunks. Normally used for iron ore dust collected from the blast furnaces. 2) PELLETS Iron ore or limestone particles are rolled into little balls in a balling drum and hardened by heat. 3) BRIQUETTES Small lumps are formed by pressing material together. Hot Iron BriQuetting (HBI) is a concentrated iron ore substitute for scrap for use in electric furnaces.
Aging 2 (english) A change in properties that occurs at ambient or moderately elevated temperatures after hot working or a heat treating operation (Quench aging in ferrous alloys), or after a cold working operation (strain aging). The change in properties is often, but not always, due to a phase change (precipitation), but does not involve a change in chemical composition. In a metal or alloy, a change in properties that generally occurs slowly at room temperature and more rapidly at higher temperatures.
Anaerobes (Environmental Engineering) A group of organisms that do not reQuire molecular oxygen. These organisms, as well as all known life forms, reQuire oxygen. These organisms obtain their oxygen from inorganic ions such as nitrate or sulfate or from protein.
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