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Traditional concrete has a water:cement ratio of about 0.5, which refers to the weight of the water divided by the weight of the cement. A water:cement ratio of 0.5 provides good workability while keeping the amount of excess water in the mix fairly low. Without at least this much extra water, the concrete would be too dry to place.
Pages in category "Cement companies of the United Kingdom" The following 13 pages are in this category, out of 13 total. This list may not reflect recent changes. A.
Aggregate Industries, a member of the Holcim Group, is a company based in the United Kingdom with headquarters at Bardon Hill, Coalville, Leicestershire.Aggregate Industries manufactures and supplies a range of heavy building materials, primarily aggregates such as stone, asphalt and concrete to the construction industry and other business sectors.
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 .
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]
In February 2011, cement company Lafarge and mining company Anglo American agreed to merge their British construction materials businesses. [1] Due to the size of the venture, the Office of Fair Trading referred it to the UK's Competition Commission, who concluded in May 2012 that, because of the potential loss of competition in the aggregates, asphalt, cement and ready-mix concrete markets ...