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Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling. [1] It is a mixture of gypsum plaster, Portland cement , and sand .
Stoplogs of a hydro power plant which can close the water flow to the turbine. Stoplogs are modular in nature, giving the operator of a gated structure the ability to control the water level in a channel by adding or removing individual stoplogs. A gate may make use of one or more logs.
Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]
The other technologies are often manufacturer specific. These electromechanical devices come with 24-volt direct-current drive units which can run continuously without generating heat, so electromechanical bar gates can be operated continuously and in an intensive duty cycle. An automatic bar gate can be operated through: Push button; Key Selector
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A stile is a structure or opening that provides passage for humans – rather than animals such as livestock – over or through a boundary. Common forms include steps, ladders, or narrow gaps. [1] Stiles are often built in rural areas along footpaths, fences, walls, or hedges that enclose domestic animals. [2]
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