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Spancrete produces precast, prestressed concrete products that are used in commercial, industrial, institutional, residential and multifamily construction projects in the Midwest and Southeast. The company also manufactures and sells hollowcore extrusion machines that are used to produce precast concrete internationally.
In October 2014, the company acquired CRS Proppants LLC, a frac sand supplier, for $225 million. [6] In February 2017, the company acquired a cement plant in Fairborn, Ohio from Cemex for $400 million. [7] In May 2024, the company began expanding its cement plant in Laramie, Wyoming. [8]
Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" during production, in a manner that strengthens it against tensile forces which will exist when in service. [1] [2]: 3–5 [3] It was patented by Eugène Freyssinet in 1928. [4]
The Precast/Prestressed Concrete Institute (PCI) published the double tee load capacity calculation (load tables) for the first time in the PCI Design Handbook in 1971. The load tables use the code to identify double tee span type by using the width in feet, followed by "DT", followed by depth in inches, for example, 4DT14 is for 4-foot (1.2 m ...
The Four Bears Bridge over the Missouri River in North Dakota utilizes precast concrete segments, erected with the balanced cantilever method (precast) The High Five Interchange connecting US-75 and I-635 in Dallas, TX (precast) The AirTrain linking NY's John F. Kennedy International Airport with the Jamaica Transit Center
Naturally precompressed exterior wall of Colosseum, Rome Cable-stayed prestressed concrete bridge over Yangtze river. In structural engineering, a prestressed structure is a load-bearing structure whose overall integrity, stability and security depend, primarily, on prestressing: the intentional creation of permanent stresses in the structure for the purpose of improving its performance under ...
The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.
Prestressed concrete is defined as a concrete construction material which is placed under compression prior to it supporting any applied loads (ie it is "pre" stressed). [1] This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete volume, and is done to improve the performance of the ...