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Term Definition
CM. 1. Construction manager. 2. Construction management. 3. Center-Matched.  
CMAA. Crane Manufacturers Association of America.  
CMACN. Concrete Masonry Association of California and Nevada.  
CMU Grout. Concrete masonry unit grout.  
CMU. Concrete Masonry Unit.  
CO. 1. Carbon monoxide. 2. Cleanout.  
CO2Extinguisher. A portable fire-fighting device which dispenses carbon dioxide to extinguish small fires.  
CO2Indicator. Instrument used to indicate the percentage of carbon dioxide in stack gases.  
CO2Sprinkler System. An overhead sprinkler system containing Carbon Dioxide, installed and set to turn on when excess heat or smoke activates built-in sensors.  
CO2. Carbon dioxide.  
Coagulant. A chemical compound, usually alum, used in swimming pools for the purpose of gathering and precipitating suspended matter.  
Coagulate. To change from a liquid into a dense mass; solidify; curdle.  
Coagulation. Precipitation of colloids into a single mass; usually caused by excessive heat or catalytic agents.  
Coal Hopper Door. Steel door to allow for addition of coal to burning chamber.  
Coal Tar. A dark brown to black cementitious material produced by the destructive distillation of bituminous coal.  
Coal Tar Bitumen. Coal Tar Pitch.  
Coal Tar Epoxy Paint. Paint in which the binder or vehicle is combination of coal tar with epoxy resin.  
Coal Tar Felt. (See TARRED FELT).  
Coal Tar Pitch. A roofing pitch made from the distillation of bituminous coal; used mainly in dead-level or low-slope roofs; coal-tar pitch comes in a narrow range of softening points from approximately l40° F to l55° F.  
Coal Tar Solvent. Derived from the distillation of coal tar.  
Coal Tar Urethane Paint. Paint in which the binder or vehicle is a combination of coal tar with polyurethane resin.  
Coalesence. In welding, the growing together, or growth into one body, of the base metal parts.  
Coarse Aggregate. Concrete aggregate over 1/4-inch diameter; crushed stone, gravel, slag, or other inert materials.  
Coarse Strainer. Basket within a pipeline to trap large debris before the pump.  
Coarse-Graded Aggregate. One having a continuous grading in sizes of particles from coarse through fine with a predominance of coarse sizes.  
Coarse-Grained Wood. Wood with wide conspicuous annual rings in which here is considerable difference between springwood and summerwood; wood with large pores such as oak, ash, chestnet, and walnut; also called Coarse-Textured and Open-Grained.  
Coarse-Textured Wood. See Coarse-Grained Wood.  
Coat of Paint. One layer of dry paint, resulting from a single wet application; single layer of paint spread at one time and allowed to harden.  
Coat Rack. A piece of furniture that is used to hang coats.  
Coat. 1. A thickness, covering or layer of plaster applied in a single operation. 2. See Caot of Paint.  

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