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What is an expansive cement and what are the different types of expansive cement?

Q. What is an expansive cement and what are the different types of expansive cement?

 

A. An expansive cement is a cement that when mixed with water produces a paste that after setting increases in volume to a greater degree than does portland-cement paste.

Type K expansive cement a mixture of portland cement, anhydrous tetracalcium trialuminate sulfate (C4A3S), calcium sulfate (CaSO4), and lime (CaO).

Type M expansive cement interground or blended mixtures of portland cement and calcium sulfate suitably proportioned.

Type S expansive cement a portland cement containing a high computed tricalcium aluminate (C3A) content and an amount of calcium sulfate above the usual amount found in portland cement.

 

References: ACI 225R-19; ACI 232.2R; SP-064; SP-38; SP-307

Topics in Concrete: Cementitious Material; Expansive Cement

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