Large SEM-BSE images of hydrated belite of ages from 14 days up to 1 year

<p>This dataset contains 8-Bit SEM-BSE images of commercially available dicalcium silicate (C₂S; belite; Vustah, Czech Republic). The belite was mixed with a water/binder ratio of 0.5. The paste was the cast in small sealed containers, which were submersed with water. The specimens were stored at 22 &plusmn; 2&deg;C.</p> <p>After the desired hydration times (14, 28, 84, 365 days) the hydration was stopped by immersing the prisms in isopropanol and drying them at 60&deg;C for 12 hours. The dried prisms were then embedded in low viscosity epoxy resin and mechanically polished using diamond paste with a grain size down to 0.25 &micro;m. Finally, the specimens were coatet with a thin layer of carbon to avoid charging.</p> <p>The images were acquired at 12 kV using a CBS (concentric backscatter) detector within a Thermofischer Helios G4 UX.</p> <p><strong>Table 1</strong>: Basic information like resolution, size and phase composition of the images.</p> <table> <tbody> <tr> <td><strong>file</strong></td> <td><strong>age</strong></td> <td><strong>size</strong></td> <td><strong>size</strong></td> <td><strong>area</strong></td> <td><strong>pores</strong></td> <td><strong>hydrates</strong></td> <td><strong>clinker</strong></td> </tr> <tr> <td>&nbsp;</td> <td>in days</td> <td>in px</td> <td>in &micro;m</td> <td>in mm&sup2;</td> <td>area-%</td> <td>area-%</td> <td>area-%</td> </tr> <tr> <td>C2S 14d.tif</td> <td>14</td> <td>36864 x 36864</td> <td>1554.0 x&nbsp;1554.0</td> <td>2.41</td> <td>31.4</td> <td>43.5</td> <td>25.2</td> </tr> <tr> <td>C2S 28d.tif</td> <td>28</td> <td>36864 x 36864</td> <td>1554.0 x&nbsp;1554.0</td> <td>2.41</td> <td>15.9</td> <td>62.6</td> <td>21.5</td> </tr> <tr> <td>C2S 84d.tif</td> <td>84</td> <td>36864 x 36864</td> <td>1554.0 x&nbsp;1554.0</td> <td>2.41</td> <td>19.3</td> <td>65.6</td> <td>15.2</td> </tr> <tr> <td>C2S 365d.tif</td> <td>365</td> <td>36864 x 36864</td> <td>1554.0 x&nbsp;1554.0</td> <td>2.41</td> <td>23.8</td> <td>64.4</td> <td>12.0</td> </tr> </tbody> </table> <p>The proportions of pores, hydrates and unhydrated clinker shown in table 1 are the result of manual thresholding of denoised versions of these images and may therefore differ to own measurements.</p> <p>The scaling is backed into the file and can be read using ImageJ/Fiji.</p> <p>The unstitched files are provded as 7z archives. The sub-images were arranged in a 10 x 10 grid. The pixel scaling of these files is the same as in the larger files.</p> <p><strong>Internal note</strong></p> <p>These files are included in the following MAPS datasets:</p> <ul> <li>2023_05_24 C32-C2S 14-84 d</li> <li>2023_06_08 C2S-C3S 28d-1year</li> </ul> <p><strong>Funding</strong></p> <p>The research was supported by the Deutsche Forschungsgemeinschaft (DFG), grant number <a href="https://gepris.dfg.de/gepris/projekt/344069666">344069666</a>.</p>