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The placement consisted of 10,251 cubic yards of concrete placed in 58.5 hours using two concrete pumps and two dedicated concrete batch plants. Upon curing, this placement allows the 50,180-square-foot (4,662 m 2 ) cofferdam to be dewatered approximately 26 feet (7.9 m) below sea level to allow the construction of the Inner Harbor Navigation ...
In 2012, Conco was awarded the concrete contract for the new $1.2 billion San Francisco 49ers Levi Stadium. The scope of the project called for extensive concrete work that consisted of slabs in excess of 2,000,000 square feet and used more than 65,000 cubic yards of concrete to complete.
Each segment of the roof is 52 feet wide at the rim, and 6.5 feet wide at the center. The central ring beam, or very center of the dome, is a heavily reinforced 4 feet thick concrete slab that contains 170 cubic yards of lightweight concrete. The entire roof used 2,880 cubic yards of light weight concrete that weighed only 105 pounds per cubic ...
The $20 million security contract includes sophisticated video analysis in which computers would alert security personnel to abnormal situations automatically. [24] On October 10, Collavino Construction poured an additional 520 cubic yards (400 m 3) of concrete for the tower's concrete core, raising it to just above street level. [25]
Concrete has a limited lifespan between batching / mixing and curing. This means that ready-mixed concrete should be placed within 30 to 45 minutes of the batching process to hold slump and mix design specifications in the US, [15] though in the UK, environmental and material factors, plus in-transit mixing, allow for up two hours to elapse. [16]
Concrete has a total embodied energy of 1.69 GJ/tonne, lower per unit mass than most common building materials besides wood. However, concrete structures often have high masses, so this comparison is not always directly relevant to decision making. Additionally, this value is based only on mix proportions of up to 20% fly ash.
The main shed was now of concrete construction 270 feet (82 m) long and 235 feet (72 m) wide across 13 tracks. A crane above one track that could lift loads of 63 long tons (64,000 kg). A new 65 feet (20 m) turntable was provided, and a mechanical coaling tower with a capacity of 300 long tons (300 t) built from concrete replaced the old wooden ...
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]
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