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Does slag cement change the hardened properties of concrete?

Slag cement improves many of the strength and durability properties of hardened concrete.  Slag cement is a hydraulic binder that, like portland cement, reacts with water to form cementitious material (calcium-silicate hydrate or CSH).  It also, similar to a pozzolan, consumes by-product calcium hydroxide from the hydration of portland cement to form additional CSH.  The resulting cement paste is stronger and denser, thus improving the concrete.

A list of improvements to hardened concrete follows, with a link to individual Slag Cement in Concrete information sheets for further detail: