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A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works, portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens. An alternative to a machine is mixing concrete by hand.
Jumia's share price sank more than 50% in one week after the report was published. [74] Citigroup, one of Jumia’s IPO underwriters, released a report debunking most of Citron’s allegations but noted that, “Jumia could do more to provide disclosure on some aspects of its operations, as a matter of transparency and best practice.” [75] [76]
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.
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]
The company was founded [8] by the Northern Nigeria Development Company and sourced its limestone from the Kalambaina formation nearby. BUA Group acquired controlling interest in CCNN in 2009 and in 2018, it facilitated the merger of its solely owned Kalambaina Cement with the publicly listed CCNN. [ 9 ]
Dangote Cement Plc is a Nigerian publicly traded multinational cement manufacturer headquartered in Lagos.The company is engaged in the manufacture, preparation, import, packaging, and distribution of cement and related products in Nigeria, and has plants or import terminals in nine other African countries.
The second main type of concrete pump, commonly referred to as a "line pump" or trailer-mounted concrete pump, is either mounted on a truck or placed on a trailer. This pump requires steel or flexible concrete placing hoses to be manually attached to the outlet of the machine and feed the concrete to the place of application. The length of the ...
Compressor – Machine to increase pressure of gas by reducing its volume; Compressed air – Air under a pressure greater than atmospheric; Pneumatics – Use of pressurised gas in mechanical systems; Pneumatic tool, also known as Air tool – Tool driven by compressed air supplied by an air compressor; Hydraulic power (disambiguation)