Abstract
The present paper summarizes studies of cementitious systems containing silica fume by 29Si MAS-NMR, often in combination with DTA/TG enabling calculation of the empirical formula for the CSH-gel and a balanced general hydration reaction for the silicious cement minerals with or without silica fume. The paper is divided into the systems lime/silica fume, calcium silicate/silica fume and portland cement/silica fume with subdivision into effect of w/(c+s) and curing temperature. The preceding findings clearly demonstrate that a cementitious paste is a “dynamic” system where the CSH-gel may vary its composition within a wide range, dependending on the mixing and reaction conditions.
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