Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 53, Issue 6, Pages 1471-1476Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-010-3134-1
Keywords
NMR; relaxation; cement; fly ash; silica fume; hydration
Funding
- National Basic Research Program of China (973 Program) [2009CB623105]
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Proton NMR spin-lattice relaxation (T (1)) was used as a prober for observing the hydration process of composite cement pastes blending fly ash and silica fume during the early age. The distribution at initial time, evolution curves and signals intensity of T (1) were shown in this paper. Results demonstrate that the T (1) distribution curves at initial time exhibit two peaks, which are regarded as two different water phases in the pastes. The evolution curves of T (1) are in good agreement with the hydration process of composite pastes and could be roughly divided into four stages: initial period, dormant period, acceleration period and steady period. The hydration mechanism for each stage was discussed. The hydration of the composite cement pastes was retarded by the addition of fly ash and silica fume when compared to that of pure cement. However, the hydration degree of the cement in the blends was promoted.
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