While cements containing fly ash or GGBS have different strength properties to ordinary Portland cement, they also benefit from improved durability and workability. A key factor in strength development is the provision of calcium silicate hydrate.

Although a particular material may be cheaper per kilogram or per tonne than another, a customer for a concrete order will require particular qualities from a cement, notably strength. Despite the varying requirements for different contracts, the usual measure of a concrete’s quality is the 28-day compressive strength.

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