Famous concrete structures include the Hoover Dam, the Panama Canal and the Roman Pantheon. The concrete dome of the Pantheon is the world's largest unreinforced concrete dome.
After the Roman Empire collapsed, use of concrete became rare until the technology was re-pioneered in the mid-18th century. Today, concrete is the most widely used man-made material (measured by tonnage).
The world record for the largest concrete pour in a single project is the Three Gorges Dam in Hubei Province, China by the Three Gorges Corporation. The amount of concrete used in the construction of the dam is estimated at 16 million cubic meters over 17 years.
The world record for concrete pumping was set in 2009, during the construction of the Parbati Hydroelectric Project, near the village of Suind, Himachal Pradesh, India, when the concrete mix was pumped through a vertical height of 2,346 ft.
The world record for largest continuously poured concrete floor was completed in 1997, in Louisville, Kentucky by design-build firm EXXCEL Project Management. The monolithic placement consisted of 225,000 sq. ft. of concrete placed within a 30-hour period.
The record for the largest continuously placed underwater concrete pour was completed in 2010, in New Orleans, Louisiana by contractor C. J. Mahan Construction Company, LLC of Grove City, Ohio. The placement consisted of 10,251 cubic yards of concrete placed in a 58.5 hour period using two concrete pumps and two dedicated concrete batch plants. Upon curing, this placement allows the 50,180 sq. ft. cofferdam to be dewatered approximately 26 feet below sea level to allow the construction of the Inner Harbor Navigation Canal Sill & Monolith Project to be completed in the dry.
— Source: Wikipedia
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