5 Simple Techniques For Concrete
social act. Từ Cambridge English Corpus The real clarification (rather than bare description) of occasions rests inside the powers and liabilities in the concrete
Stylized cacti enhance a seem/retaining wall in Scottsdale, Arizona Prestressed concrete is usually a type of reinforced concrete that builds in compressive stresses during building to oppose tensile stresses knowledgeable in use. This could certainly drastically decrease the excess weight of beams or slabs, by
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Concrete has an exceedingly minimal coefficient of thermal enlargement and shrinks because it matures. All concrete structures crack to some extent, because of shrinkage and stress. Concrete which is subjected to extended-length forces is at risk of creep.
Whilst ready mixed concrete is usually sent to the point of placement in a number of approaches, the overwhelming majority of it truly is introduced to the construction site in truck-mounted, rotating drum mixers. Truck mixers Have got a revolving drum Along with the axis inclined into the horizontal.
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Fashionable concrete is frequently organized like a viscous fluid, to make sure that it could be poured into forms. The sorts are containers that determine the specified shape.
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A appropriately proportioned concrete combination will possess the specified workability to the fresh concrete as well as required longevity and toughness for that hardened concrete.
Concrete also presents fantastic resistance versus externally used forces including substantial winds, hurricanes, and tornadoes owing to its lateral stiffness, which leads to nominal horizontal motion.
The ducts are then filled with grout. Bridges designed in this way have Concrete knowledgeable significant corrosion of your tendons, so external write-up-tensioning might now be utilised in which the tendons run alongside the outer surface in the concrete.
We have a basic notion of what we wish, but absolutely nothing concrete in the intervening time. 我们对需要什么有个大致的想法，可是具体的东西目前还没有想好。 反义词
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When aggregate is blended with dry Portland cement and water, the combination kinds a fluid slurry that is well poured and molded into form. The cement reacts with the drinking water through a system named concrete hydration[4] that hardens it in excess of a number of several hours to type a tough matrix that binds the components together into a durable stone-like substance that has a lot of works by using.[five] This time permits concrete to not simply be Forged in sorts, but also to get various tooled procedures done.