Abstract
Additions of colloidal silicas and silicates were added to portland cement and tricalcium silicate pastes to assess their pozzolanic reactivity. These materials show early reductions of calcium hydroxide consistent with a rapid pozzolanic reaction. High early strengths were generally observed with siliceous additions but later strengths were less affected, although somewhat variable. Colloidal silicas have very high water requirements which must be overcome.
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