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Interaction of alkali and alkali earth metal hydroxides with microsilica

Authors
Journal
Cement and Concrete Research
0008-8846
Publisher
Elsevier
Publication Date
Volume
28
Issue
11
Identifiers
DOI: 10.1016/s0008-8846(98)00139-2

Abstract

Abstract Microsilica is inert to trimethylsilylation unless activated by alkaline conditions. In a sodium hydroxide–microsilica model system that simulates the alkaline conditions present in Portland cement, microsilica can be activated to produce polyorganosiloxanes. A calcium hydroxide–microsilica model system is shown to possess pozzolanic reactivity, and calcium hydroxide reacts with microsilica to form an intermediate C-S-H gel that also can be trimethylsilylated to produce polyorganosiloxanes.

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