Abstract
X-ray computed tomography was used to study the early hydration of cement. The two-dimensional slices and three-dimensional images were investigated, and porosity and unhydrated cement particles were analysed quantitatively. This work confirmed that X-ray computed tomography can be used to observe the early hydration of cement as an in situ and non-destructive technique. The cement paste, holes, unhydrated cement particles, and the mould were observed in two-dimensional slices distinguished by grey values. Self-desiccation shrinkage caused the separation of the specimen from the mould after 8 hours of hydration. After 24 hours, the residual water in the crack disappeared, the holes inside the specimen remained unstable and the number of unhydrated cement particles continued to decrease.
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