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Sustainability – technical feature

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12 | Concrete TodayBRMCA British Ready-Mixed Concrete is a wide range of cement and cementitious materials avail-able in the UK, available as either factory-made composite cements, or equivalent combinations of CEM I (Portland cement ) and additional materials added at the concrete mixer. There is a growing demand to use these cements and additions as they will help reduce the envi-ronmental impact of concrete, may reduce cost and can be used to enhance durability. The most commonly used additional mate-rials, used either in factory-made or combination cements, are ground granulated blastfurnace slag (ggbs), fly ash, limestone and silica reactivity of the additional materials depends on their chem-ical composition and their fineness.

Cement strength is based on testing a standard mortar, one part cement to three parts sand at a water/cement of 0.5, and so there will be no direct relation-ship between cement strength and concrete strength where the mix proportions will be very different. It is also important to note that there is no unique relationship

  Important, Cement

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