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Summary: An explanation of terms used in the home improvement, building and construction trades for letter B.
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Building dictionary for the letter B - Page 9
Blast
To loosen, crack, or move rock or hard-packed soil by the detonation of explosives.
Blast area
The area in which explosives loading and blasting operations are being conducted.
Blast cleaning
Any cleaning method in which air, liquid, abrasive, or some combination of these is applied under pressure.
Blast heater
A unit heater containing a set of heat-transfer coils through which air is forced or drawn at high velocities.
Blast hole
A vertical hole with a diameter of at least 4" and drilled to accept a charge of blasting explosives.
Blast-furnace slag
The nonmetallic waste that develops simultaneously with iron in a blast furnace. Consists essentially of silicates and aluminosilicates of calcium and other bases.
Blast-resistant door
A steel door designed and fabricated to resist dynamic pressures of short duration.
Blasthole drill
A device that bores blast holes.
Blasting
The process of loosening rock or hard-packed material with explosives.
Blasting agent
A material or mixture consisting of a fuel and oxidizer used for blasting, but not classified as an explosive and in which none of the ingredients is classified as an explosive, provided the finished product cannot be detonated with a No. 8 blasting cap when confined. An example is a mixture of ammonium nitrate and fuel oil or coal.
Blasting cap
A metallic tube closed at one end, containing a charge of one or more detonating compounds, designed for and capable of detonation from the sparks or flame of a safety fuse inserted and crimped into the open end.
Blasting mat
A blanket of interwoven steel cable or interlocking steel rings placed over a blast to contain the resultant fragments.
Bleaching
Lightening, whitening, or removing color, either by chemical means, such as chlorine or oxalic acid, or by exposure to certain kinds of light.
Bleeder
A small valve used to drain fluid from a pipe, radiator, or small tank.
Bleeder pipe
A pipe (usually clay) placed to allow water from outside a basement retaining wall to pass through the foundation into drains within the building.
Bleeding
(1) The autogenous flow of mixing water within, or its emergence from, freshly placed concrete or mortar. Bleeding is caused by the settlement of the solid materials within the mass. Also called water grain. (2) In painting, seepage of resin or an undercoating of paint through the finish coat. (3) In timber, the exuding of sap or resin.
Blind
(1) Any panel, shade, screen, or similar contrivance used to block light or inhibit viewing. (2) An assembly of timber stiles, rail and timber slats, or louvers used in conjunction with doors and windows.
Blind alley (cul-de-sac)
Any alley, road, or passageway that has only one end open for access or exit, and is closed at the other end so as to prohibit through traffic.
Blind door
A door with a louver instead of glass.
Blind dovetail
See secret dovetail.
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