Abstract
Tricalcium silicate is the major constituent of Portland cement, and the kinetics of its hydration is a major topic in concrete technology. Nuclear resonance reaction analysis using 15N has been applied to measure the evolution of the hydrogen profile. During the first few hours, the induction period, the hydrogen diffusion is controlled by a 10–20 nm thick surface layer. To observe this layer, the beam energy resolution must be on the order of 10 keV or less. This has been achieved at the dynamitron tandem accelerator at the Ruhr Universität Bochum.
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