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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.
BUA Cement, Obu, Okpella, Edo State Former Edo cement, near Benin City. BUA Cement, Kalambaina Sokoto State. Commissioned July 2018; Cement Company of Northern Nigeria, also known as Sokoto Cement, with 6 offices in northern states [38] Dangote Cement [39] Benue Cement Company (now under Dangote group)
Compression Systems began in 1833 when Charles and Elias Cooper established a foundry in Mt. Vernon, Ohio. "Cooper", as it was known, was licensed to produce the Corliss steam engine in 1869 and entered the production of natural gas internal combustion engines in 1900.
Lafarge Africa Plc is an industrial company headquartered in Lagos, Nigeria, and listed on the Nigerian Stock Exchange. It is majorly controlled by the Holcim Group . Previously trading under the name of Lafarge Wapco Plc, the merger of Lafarge and Holcim and resulting consolidation of Lafarge's assets in Nigeria and South Africa resulted in ...
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 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 ...
Pre-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned prior to the concrete being cast. [1]: 25 The concrete bonds to the tendons as it cures, following which the end-anchoring of the tendons is released, and the tendon tension forces are transferred to the concrete as compression by static friction.
By defining the compression cycle as isentropic, an ideal efficiency for the process can be attained, and the ideal compressor performance can be compared to the actual performance of the machine. Isotropic Compression as used in ASME PTC 10 Code refers to a reversible, adiabatic compression process [28] Isentropic efficiency of Compressors: