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The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1] Reinforced concrete is the most common form of concrete. The reinforcement is often steel rebar (mesh, spiral, bars and other forms). Structural fibers of various materials are available.
A bricklayer under ideal conditions can lay as many as 500 bricks a day; [3] if the hod carrier is serving a team of two then he must move 1,000 bricks although it is not uncommon for experienced hod carriers to serve three bricklayers. The World Record for moving 500 bricks by hod is 12 minutes and was set by Daren Whitmore on 12 February 2011.
Nikolaus Pevsner described it as "a crazy effort in blue brick." [1] Viaduct carrying the line and platforms of Birmingham Snow Hill station. Staffordshire blue brick is a strong type of construction brick, originally made in Staffordshire, England. Brick made by H Doulton & Co. of Rowley Regis, displayed in the Black Country Living Museum
The density of solid clay bricks is around 2000 kg/m 3: this is reduced by frogging, hollow bricks, and so on, but aerated autoclaved concrete, even as a solid brick, can have densities in the range of 450–850 kg/m 3.
Brick size may be slightly different due to shrinkage or distortion due to firing, etc. An example of a co-ordinating metric commonly used for bricks in the UK is as follows: [4] [5] [6] Bricks of dimensions 215 mm × 102.5 mm × 65 mm; Mortar beds (horizontal) and perpends (vertical) of a uniform 10 mm.
Fabric "weight" is often specified as mass per unit area, grams per square meter (gsm) or ounces per square yard. It is also sometimes specified in ounces per yard in a standard width for the particular cloth. One gram per square meter equals 0.0295 ounces per square yard; one ounce per square yard equals 33.9 grams per square meter.
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They were able to tow a 2-ton block on a sledge across wood tracks with 12 to 20 men. This effort used 6 to 10 men per ton. The pyramid was 54 cubic meters total estimated weight 135 tons. It was built out of 186 stones. The average weight of each stone was almost 1,500 lb (680 kg) (.75 tons).