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Term Definition
Mixer, Pan. see Mixer, Vertical Shaft.  
Mixer, Plant. An operating installation of equipment including batchers and mixers as required for batching or for batching and mixing concrete materials; also called mixing plant when equipment is included.  
Mixer, Tilting. A rotating drum mixer that discharges by tilting the drum about a fixed or movable horizontal axis at right angles to the drum axis; the drum axis may be horizontal or inclined while charging and mixing.  
Mixer, Vertical Shaft. A cylindrical or annular mixing compartment having an essentially level floor and containing one or more vertical rotating shafts to which blades or paddles are attached; the mixing compartment may be stationary or rotate about a vertical axis.  
Mixer. A machine used for blending the constituents of concrete, grout, mortar, cement paste, or other mixtures.  
Mixing Chamber. That part of a gas-welding or oxygen-cutting torch wherein the gases are mixed prior to combustion.  
Mixing Cycle. The time taken for a complete cycle in a batch mixer.  
Mixing Faucet. separate faucets having a common spout providing control of the water temperature.  
Mixing Speed. Rotation rate of a mixer drum or of the paddles in an open-top, pan, or trough mixer, when mixing a batch; expressed in revolutions per minute, or in peripheral feet per minute of a point on the circumference at maximum diameter.  
Mixing Time. The period during which the constituents of a batch of concrete are mixed by a mixer; for a stationary mixer, time is given in minutes from the completion of mixer charging until the beginning of discharge.  
Mixing Valve. A valve that permits mixing of liquids or a liquid and a gas.  
Mixing Water. The water in freshly mixed sand-cement grout, mortar, or concrete, exclusive of any previously absorbed by the aggregate.  
Mixing, Open-Top. A truck-mounted mixer consisting of a trough or a segment of a cylindrical mixing compartment within which paddles or blades rotate about the horizontal axis of the trough.  
Mixture. The assembled, blended, co-mingled ingredients of mortar, concrete, or the like; or the proportions for their assembly.  
MLA. Metal Lath Steel Framing Division of National Association of Architectural Metal Manufacturers.  
Mnemonic. 1. Tending to assist memory. 2. Markings on fabricated parts to assist in assembling or installing in the right place.  
Mobility. The degree to which a material flows.  
Mobilization. 1. The act of putting into movement or circulation. 2. The assembly and movement of equipment to a jobsite.  
Modacrylics. Modified acrylics; see Acrylics.  
Modal Analysis. Determination of earthquake design forces based upon the theoretical response of a structure in its several modes of vibration to excitation.  
Mode. 1. A manner of style or fashion. 2. A way of doing something. 3. The most frequent value in a set of data. 4. The slope of the vibration curve  
Model. The original from which a mould or copy is made.  
Modem. A device that connects a computer to the telephone system.  
Modification. An agreed change to the terms of a contract.  
Modified Bitumen. Bituminous membranes modified with styrene butadiene or atactic polypropylene to improve flexibility, elasticity, cohesive strength, resistance to flow and toughness.  
Modified Mercalli. Modification of the original Mercalli Scale to represent construction materials and methods in the United States compared to the European construction methods and materials of the original Mercalli Scale.  
Modular Dimensional Standards. Dimensional standards approved by the American Standards Association for all building material and equipment, based upon a common unit of measure of four inches, known as the module; this module is used as a basis for the grid which is essential for dimensional coordination of two or more different materials.  
Modular Masonry Unit. One whose nominal dimensions are based on the four inch module.  
Modular Ratio. The ratio of modulus of elasticity of steel (Es) to that of concrete (Ec) usually denoted by the symbol n.  
Modular. Of or consisting of modules.  

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