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  • Ready-mix concrete

    serch.it?q=Ready-mix-concrete

    1.6 cuM. transit mixer Small batching plant for local small deliveries The inside of a volumetric mixer. It uses a simple Archimedes' screw to mix (clockwise) and to lift the concrete to the delivery chute.Ready-mix concrete is concrete that is manufactured in a batch plant, according to a set engineered mix design. Ready-mix concrete is normally delivered in two ways. First is the barrel truck or in–transit mixers. This type of truck delivers concrete in a plastic state to the site. Second is the volumetric concrete mixer. This delivers the ready mix in a dry state and then mixes the concrete on site. Batch plants combine a precise amount of rock, sand, water and cement together by weight, allowing specialty concrete mixtures to be developed and implemented on construction sites. The first ready-mix factory was built in the 1930s, but the industry did not begin to expand significantly until the 1960s, and it has continued to grow since then. Ready-mix concrete is often preferred over other materials due to the cost and wide range of uses, from bird baths to high rise buildings and bridges. It has a long life span when compared to other products of a similar use, like road ways. It has an average life span of 30 years under high traffic areas compared to the 10 to 12 year life of asphalt concrete with the same traffic. Ready-mix concrete, or RMC as it's also known, refers to concrete that is specifically batched or manufactured for customers' construction projects. It is a mixture of Portland cement, water and aggregates: sand, gravel, or crushed stone. All aggregates should be of a washed type material with limited amounts of fines or dirt and clay. Ready-mix concrete is bought and sold by volume - usually expressed in cubic meters (cubic yards in the US). Ready-mix concrete is batched or manufactured under controlled conditions. It can be transported and placed at site using a number of methods. In 2011, there were 2,223 companies employing 72,924 workers that produced RMC in the United States.

  • Tarmac (company)

    serch.it?q=Tarmac-(company)

    Logo as Lafarge TarmacTarmac is a British building materials company headquartered in Solihull, England. The company was formed as Lafarge Tarmac in March 2013, by the merger of Anglo American's Tarmac UK and Lafarge's operations in the United Kingdom. In July 2014, Anglo American agreed to sell its stake to Lafarge, to assist Lafarge in its merger with Holcim and allay competition concerns. Prior to 1999, Tarmac Plc was an aggregates to construction company dating from 1903. It was demerged in July 1999, with the Construction and Professional services arms forming Carillion plc. The aggregates and building materials side of the business retained the Tarmac name and was bought by Anglo American shortly afterwards. In February 2015, Lafarge announced that the business would be sold to CRH plc, once Anglo American had sold its stake. Anglo American completed the sale in July 2015, and the acquisition by CRH completed the following month. Following the purchase, Lafarge Tarmac was rebranded as Tarmac.

  • CRH plc

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    CRH plc is an international group of diversified building materials businesses which manufacture and supply of a wide range of products for the construction industry. The company is incorporated and domiciled in Ireland where it ranks as the largest Irish company. CRH has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It has secondary listings on the Irish Stock Exchange (where it is a constituent of the ISEQ 20) and New York Stock Exchange.

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