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Spall

(Concrete Engineering) A fragment, usually of flaky shape, detached from a larger mass by pressure, expansion from within the larger mass, a blow, or by the action of weather.

Nitrogen fixation

(Environmental Engineering) The conversion of atmospheric (or dissolved) nitrogen gas into nitrate by microorganisms.

Covalent bond

(Environmental Engineering) A bond in which electrons are shared approximately equally by two atoms.

Mass:

(english) A property of an object measured by the degree that it resists acceleration.

Portland Cement (ASTM C 150)

(Concrete Engineering) The product obtained by pulverizing clinker consisting essentially of hydraulic calcium silicates.

Ottawa Sand

(Concrete Engineering) A sand used as a standard in testing hydraulic cements by means of mortar test specimens. Sand is produced by processing silica rock particles obtained by hydraulic mining of the orthoquartzite situated in open-pit deposits near Ottawa, Illinois; naturally rounded grains of nearly pure quartz.

Burn

(english) 1) Process of cutting metal by a stream of fuel and oxygen, 2) to permanently damage a metal or alloy by heating to cause either incipient melting or intergranular oxidation.

Plane of Weakness

(Concrete Engineering) The plane along which a structure under stress will tend to fracture; may exist because of the nature of the structure and its loading, by accident, or by design.

Blue Print

(english) A pen or ink line drawing reproduced (printed) on sensitized paper by direct exposure.

Butt Welding

(english) Joining two edges or ends by placing one against the other and welding them.

Bi-Coil

(english) Also BY-COIL. Tin Mill term. Customers buy "by coil" or "bi-coil" rather than cut sheets

Adsorption Water

(Concrete Engineering) Water held on surfaces in a material by either physical and/or chemical forces.

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