(from the article `concrete`) Another innovation in masonry construction is the use of prestressed concrete. It is achieved by either pretensioning or posttensioning processes. In ... ...(3.5-inch-) thick corrugated parabolic vaults spanning 80 metres (266 feet) and pierced by windows. In the 1920s Freyssinet made a major ... Precast...
Found on
http://www.britannica.com/eb/a-z/p/110
A method of prestressing reinforced concrete in which the steel is stressed before the concrete has hardened and restrained from gaining its unstressed position by bond to the concrete.
Found on
https://www.encyclo.co.uk/local/21066
No exact match found.
