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Anchor channels, invented by Anders Jordahl in 1913, are steel channels cast flush in reinforced concrete elements to allow the installation of channel bolts for the fastening of components. Anchor channels consist of steel C-shaped channels and anchors (mostly headed studs ) which are connected to the channel by welding or riveting/forging.
Ethiopia has 20 cement factories which produce mainly OPC and PPC cement. Two other cement factories are in the pipeline. As of 2017, production capacity in Ethiopian, according to the Ethiopian Reporter, [14] has increased to 15 million tonnes per year, but local consumption is only 6 million tonnes per year.
Table 2 - Hydraulic Cement – production – Africa and Middle East (thousand metric tons) [2] Country: 2012 2011 2010 2009 2008 2007 2006 2005 2004
Dolosse moulds are in the foreground - Durban, South Africa. Dolosse are normally made from un-reinforced concrete, poured into a steel mould. [1]: 11 The concrete will sometimes be mixed with small steel fibers to strengthen it in the absence of reinforcement. Durban's South Pier with a line of interlocking dolosse, South Africa
Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels, floors, roofs, and piles.
Holcim operates four businesses segments: cement, aggregates, ready-mix concrete, and other products, including precast concrete, asphalt, mortar, and other building materials. Originally, the company was established as LafargeHolcim by the merger on 10 July 2015 of Holcim and Lafarge , which had combined sales of CHF 26.7 billion in 2019. [ 3 ]
Pages in category "Lists of buildings and structures in Africa" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes .
Elmina Castle, the first slave fort in West Africa, was also the first European prefabricated building in Sub-saharan Africa. [3]: 93 In North America, in 1624 one of the first buildings at Cape Ann was probably partially prefabricated, and was rapidly disassembled and moved at least once.