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Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin, and is usually made from limestone.
Ready-mix concrete ( RMC) is concrete that is manufactured in a batch plant, according to each specific job requirement, then delivered to the job site "ready to use". [ 1] There are two types with the first being the barrel truck or in–transit mixers. This type of truck delivers concrete in a plastic state to the site. [ 2]
Concrete recycling is the use of rubble from demolished concrete structures. Recycling is cheaper and more ecological than trucking rubble to a landfill. [ 1] Crushed rubble can be used for road gravel, revetments, retaining walls, landscaping gravel, or raw material for new concrete.
Regular concrete can typically withstand a pressure from about 10 MPa (1450 psi) to 40 MPa (5800 psi), with lighter duty uses such as blinding concrete having a much lower MPa rating than structural concrete. Many types of pre-mixed concrete are available which include powdered cement mixed with an aggregate, needing only water. [citation needed]
Lafarge is a French industrial company specialising in cement, construction aggregates, and concrete. It is the world's largest cement manufacturer. It was founded in 1833 by Joseph-Auguste Pavin de Lafarge and is a part of the Holcim Group . In 2015, Lafarge merged with Holcim and a new company was formed under the name of LafargeHolcim.
Traditional gravel-concrete can be 40 N/mm 2 strong and weigh over 2.000 kg/m 3. Technology. The special additive is produced in a factory and shipped to the site of application in 5–25 kg bags. It is mixed together with cement (100–300 kg/m 3), waste materials (1.1-1.2 m 3) and water (100-300 liters), plus 5 kg/m 3 of the additive powder.
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