Concrete - An Overview
An early example at Hoover Dam utilised a network of pipes among vertical concrete placements to circulate cooling h2o throughout the curing procedure to prevent detrimental overheating. Equivalent devices remain utilized; determined by quantity from the pour, the concrete blend employed, and ambient air temperature, the cooling approach could past For several months after the concrete is positioned. Numerous procedures are also accustomed to pre-cool the concrete mix in mass concrete buildings.[126]
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Important discounts in time final result from manufacture of structural aspects in addition to the number of occasions which establish General length of the development, known by scheduling engineers because the 'essential route'.
The cement business is without doubt one of the a few Principal producers of carbon dioxide, A serious greenhouse gasoline – one other two becoming Electrical power manufacturing and transportation industries. On typical, every tonne of cement developed releases one particular tonne of CO2 into the environment. Pioneer cement brands have claimed to achieve decrease carbon intensities, with 590 kg of CO2eq per tonne of cement manufactured.[one hundred thirty five] The emissions are resulting from combustion and calcination processes,[136] which roughly account for 40% and sixty% with the greenhouse gases, respectively.
These creating strategies were not isolated to pouring concrete, but were being and therefore are commonly used in masonry.
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To load, or cost, Uncooked components from the transit combine plant or centrally blended concrete in the truck, the drum should be turned really rapidly within the charging path. Following the concrete is loaded and mixed, it's Commonly hauled to the job web site With all the drum turning at a velocity of fewer than 2 rpm.
Pretensioned concrete is nearly always precast, and includes metal wires (tendons) that are held in pressure though the concrete is put and sets all-around them.
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The ducts are then stuffed with grout. Bridges designed in this manner have seasoned substantial corrosion from the tendons, so external write-up-tensioning could now be used wherein the tendons run together the outer surface area from the concrete.
该例句来自Hansard存档。包含以下议会许可信息开放议会许可v3.0 I've explained the technical problem ahead of; namely, Concrete Contractor you can carry out concreting on a construction web page in a temperature of about three degrees centigrade. 来自 Hansard archive
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