hardened

made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass"

protected against attack (especially by nuclear weapons); "hardened missile silos"

used of persons; emotionally hardened; "faced a case-hardened judge"

made tough by habitual exposure; "hardened fishermen"; "a peasant, dark, lean-faced, wind-inured"- Robert Lynd; "our successors...may be graver, more inured and equable men"- V.S.Pritchett

converted to solid form (as concrete)