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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.
Putzmeister was founded by Karl Schlecht in 1958. [3] Schlecht designed a mortar machine based on his diploma thesis at the University of Stuttgart. [4]In 1986, Putzmeister 52Z's were used in the Chernobyl nuclear accident, pumping over 300,000 m 3 (390,000 cu yd) of concrete to entomb reactor number 4, setting a world record at the time for volume pumping.
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 ...
Cubic or cylindrical samples of concrete are tested under a compression testing machine to measure this value. Test requirements vary by country based on their differing design codes. Use of a Compressometer is common. As per Indian codes, compressive strength of concrete is defined as: Field cured concrete in cubic steel molds (Greece)
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.
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.
Once the machine is started it begins to apply an increasing load on specimen. Throughout the tests the control system and its associated software record the load and extension or compression of the specimen. Machines range from very small table top systems to ones with over 53 MN (12 million lbf) capacity. [3] [4]
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: