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by Jon S. Belkowitz, PhD and Mallory A. Westbrook
When a diffusing CSH species collides with either solid C3S or C2S or previously deposited CSH, it is converted into solid CSH with a probability of 1.
 Bentz, D. P. Influence of water-to-cement ratio on hydration kinetics: simple models based on spatial considerations. Cement and Concrete Research. 36. 238–244. 2006.