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Term Definition
Adhesion. 1. The state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking action, or both; bonding strength; the attraction of a coating to the substrate, or of one coat of paint to another. 2. The soil quality of sticking to buckets, blades, and other parts of excavators.  
Adhesive Application. A means of applying gypsum board utilizing adhesives and supplemental mechanical fasteners.  
Adhesive Bond. A relationship between two materials in contact with each other causing them to stick or adhere together by means other than cohesion.  
Adhesive Failure. Failure of an adhesive joint when the plane of separation is at the adhesive-adherend interface.  
Adhesive Spreader. A notched trowel used in the application of laminating adhesives.  
Adhesive Wall Cups. Special clips or nails with large perforated bases for mastic application to most firm surfaces.  
Adhesive, Ceramic. Used for bonding tile to a surface; rubber solvents; rubber- and resin-based emulsions used as adhesives.  
Adhesive, Pressure-Sensitive. An adhesive that will adhere to a surface at room temperature by briefly applied pressure alone.  
Adhesive, Roof. A bonding agent used to cement roof materials.  
Adhesive, Solvent. An adhesive having a volatile organic liquid as a vehicle, not including water-based adhesives.  
Adhesive, Tile. Organic adhesive used for bonding tile to a surface; rubber solvents and resin-based and rubber emulsions can be used as adhesives.  
Adhesive. 1. A material capable of holding other materials together by surface attachment; glues, cements, pastes, epoxy, and mucilage are some of the common adhesives. 2. A compound, glue, or mastic used in the application of gypsum board products to framing or for laminating one or more layers of gypsum boards.  
Adiabatic Compression. Compressing refrigerant gas without removing or adding heat.  
Adiabatic Curing. The maintenance of ambient conditions during the setting and hardening of concrete so that heat is neither lost nor gained.  
Adiabatic. 1.Impassable to heat. 2. Occurring without gain or loss of heat.  
Adjacent. Nearby or adjoining.  
Adjustable Bar Hanger. A metal hanger that can be made to fit the varying distances between floor and ceiling joists or rafters to securely hold electrical outlet boxes and devices.  
Adjustable Shelf Standard. Metal items to support shelves usually in the form of strips attached to vertical surfaces.  
Adjustable Shelf. A shelf that can be adjusted to different heights.  
Adjustable Speed Motor. One in which the speed can be varied gradually over a considerable range, but when once adjusted remains practically unaffected by the load, such as shunt motors designed for a variation of field strength.  
Adjustable Triangle. A transparent plastic drafting tool that can be adjusted and set for any angle.  
Adjustable Wrench. An open faced wrench which can be adjusted to different sizes.  
Admixture. 1. A material other than water, aggregates, and hydraulic cement used as an ingredient of concrete or mortar, and added immediately before or during its mixing. 2. A chemical additive used to alter the normal properties of concrete. 3. Any substance added to a plaster component or to plaster mortar for the purpose of altering its properties.  
Adobe Masonry. Construction that utilizes unburned (unfired) clay masonry units.  
Adobe. Unburned or unfired brick, dried in the sun.  
ADR. Alternative Dispute Resolution; includes mainly negotiation, mediation, and arbitration.  
Adsorbed Water. Water held on surfaces in a material by either physical and/or chemical forces.  
Adsorbent. Usually of a solid, having the ability to attract molecules of liquids, solutions, or gasses that adhere to its surface.  
Adsorption. The process of attraction to a surface; the attachment of foreign molecules on the surface of a substance.  
Adulteration. The addition of unwanted materials.  

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