Enhanced Mechanical and Microstructural Properties of Portland Cement Composites Modified with Submicron Metakaolin

Figure 10

The SEM images of the HCS samples: (a) N0 at a curing period of 3 days; (b) NB3 at a curing period of 3 days; (c) N0 at a curing period of 28 days; (d) NB3 at a curing period of 28 days.

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(b)

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(d)