Term: Hardening

Hardening

A process involving the formation of cements (e.g., Portland cement, geopolymers) during which intermediate phases [e.g., calcium silicate (CS) phases in Portland cement] (re)crystallize to new phases by hydration (e.g., Portland cement) or dehydration (e.g., geopolymer cement). Ingredients (e.g., naphthalene sulfonate, a plastifier) may be added to delay hardening.
Cf., calcium silicate (CS) phases, calcium silicate hydrate (CSH) phases, geopolymer, geopolymerization, Portland cement