Accelerated microstructural evolution of a Calcium-Silicate-Hydrate (C-S-H) phase in pozzolanic ...


Traditional pozzolanic mortars such as those from Rhodes, Greece, or Hagia Sophia, Turkey, reveal the presence of a calcium-silicate-hydrate (C-S-H) binding phase. This phase, which is similar to that found in ordinary Portland cement (OPC), is produced by the pozzolanic reaction of slaked lime  with fine reactive siliceous sources at temperatures < 100 C. The traditional siliceous sources were replaced by fumed silica or TEOS.  Microstructural analysis showed an enhanced  reaction rate but similar morphologies of the resultant C-S-H phases, confirming that the reaction-limiting factor is the dissolution of the siliceous sources.  The rate of the pozzolanic reaction can be further increased by appropriate selection of the reactants, showing great potential for the use of pozzolanic mortars in modern-day applications.  13 refs.

Primary author(s): Moropoulou A; Cakmak A; Labropoulos K C; Van Grieken R;

                            Athens,National Technical University; Princeton,University;  Antwerp,Instelling University

Source: Cem.Concr.Res.


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