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5 results for “alite”
Large SEM-BSE images of hydrated alite of ages from 1 day up to 1 year
<p>This dataset contains 8-Bit SEM-BSE images of commercially available tricalcium silicate (C<sub>3</sub>S; alite, MIII polymorph; Vustah, Czech Republic). The alite 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 ± 2°C.</p> <p>After the desired hydration times (1, 7, 14, 28, 84, 365 days) the hydration was stopped by immersing the prisms in isopropanol and drying them at 60°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 µm. Finally, the specimens were coatet with a thin layer of carbon to avoid charging.</p> <p>The images were acquired at 10 kV (7 days, smaller image), 12 kV (7 - 365 days) and 15 kV (1 days) using a CBS (concentric backscatter, 14-365 days) and a ABS (1 and 7 days) 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> </td> <td>in days</td> <td>in px</td> <td>in µm</td> <td>in mm²</td> <td>area-%</td> <td>area-%</td> <td>area-%</td> </tr> <tr> <td>C3S 1d.tif</td> <td>1</td> <td>21179 x 21495</td> <td>749.9 x 749.9</td> <td>0.56</td> <td>38.5</td> <td>38</td> <td>23.9</td> </tr> <tr> <td>C3S 7d.tif</td> <td>7</td> <td>19433 x 19320</td> <td>390.9 x 390.9</td> <td>0.15</td> <td>32.2</td> <td>48.5</td> <td>19.4</td> </tr> <tr> <td>C3S 7d_2.tif</td> <td>7</td> <td>36864 x 36864</td> <td>1554.0 x 1554.0</td> <td>2.41</td> <td>28.5</td> <td>52.8</td> <td>19.1</td> </tr> <tr> <td>C3S 14d.tif</td> <td>14</td> <td>36864 x 36864</td> <td>1554.0 x 1554.0</td> <td>2.41</td> <td>22.2</td> <td>62.7</td> <td>15.4</td> </tr> <tr> <td>C3S 28d.tif</td> <td>28</td> <td>36864 x 36864</td> <td>1554.0 x 1554.0</td> <td>2.41</td> <td>16.9</td> <td>74.9</td> <td>8.3</td> </tr> <tr> <td>C3S 84d.tif</td> <td>84</td> <td>36864 x 36864</td> <td>1554.0 x 1554.0</td> <td>2.41</td> <td>21.7</td> <td>72.7</td> <td>5.7</td> </tr> <tr> <td>C3S 365d.tif</td> <td>365</td> <td>36864 x 36864</td> <td>1554.0 x 1554.0</td> <td>2.41</td> <td>14.8</td> <td>83.2</td> <td>2.0</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, with the exception of the 7 days image, which was arranged in a 9x9 grid. The pixel scaling of these files is the same as in the larger files. The unstitched files for the 1 day specimen can be provided on request.</p> <p><strong>Internal note</strong></p> <p>These files are included in the following MAPS datasets:</p> <ul> <li>2019_04_15 FK C3S 1d</li> <li>2019_04_23 C3S 7d 15 BIB</li> <li>2023_05_24 C32-C2S 14-84 d</li> <li>2023_06_08 C2S-C3S 28d-1year</li> <li>2023_07_18 C3S 7d, C2S 1d, 7d, 3C3S-1C2S 7d</li> </ul> <p><strong>Changelog</strong></p> <ul> <li>2023-08-03, V1.1 Added new dataset (C3S 7d_2.tif).</li> <li>2024-02-07, V1.1 modified description (error in hydrate/C<sub>3</sub>S measurement for the 14 days dataset)</li> </ul>
Dense inner C-S-H of 28 d hydrated alite, prepared using BIB at 20 °C
<p>These are images of 28 days hydtrated alite (M3 polymorph, Vustah, Czech Republic). The preparation of the specimens will be described in the corresponding Paper "<em>Argon Broad Ion beam sectioning and high resolution scanning electron microscopy imaging of hydrated alite</em>" published in Cement and Concrete Research.</p> <p>This dataset shows SEM images of the specimens prepared at <strong>20 °C</strong> in a tripple Argon Broad Ion Beam device.</p> <p>For all images described in the supplementary data of the paper, thee corresponding pore segmentation and ignored area is provided as well. This excludes the file "C3S 28d BIB 6KV 6h_019.tif".</p> <p>All files were acquired usng a Nova Nano SEM 230, FEI in SE mode at 2 KV and nearly the same magnification.</p>
Dense inner C-S-H of 28 d hydrated alite, prepared using BIB at -140 °C
<p>These are images of 28 days hydtrated alite (M3 polymorph, Vustah, Czech Republic). The preparation of the specimens will be described in the corresponding Paper "<em>Argon Broad Ion beam sectioning and high resolution scanning electron microscopy imaging of hydrated alite</em>" published in Cement and Concrete Research.</p> <p>This dataset shows SEM images of the specimens prepared at <strong>-140 °C</strong> in a tripple Argon Broad Ion Beam device.</p> <p>For all images described in the supplementary data of the paper, thee corresponding pore segmentation and ignored area is provided as well. This excludes the file "C3S 28d cryo BIB 6h_015.tif".</p> <p>All files were acquired usng a Nova Nano SEM 230, FEI in SE mode at 2 KV and nearly the same magnification.</p> <p> </p>
Synthesis and scaled-up of standard and active Belite-Alite-Ye'elimite clinker (BAY)
<p><strong>ABSTRACT:</strong> Clinkers with the coexistence of belite-alite-ye´elimite (BAY) are considered as eco-friendly cements due to the reduced CO<sub>2</sub> emissions released during their manufacture. All BAY clinkering parameters have been optimized: raw materials, mineralizers/activators, clinkering conditions and scaled-up methodology. Two types of clinkers were prepared and scaled-up to have ~2 kg: i) standard-BAY (28.4 wt% of b-belite, 41.5 wt% of alite and 17.4 wt% of ye'elimite) by adding CaF<sub>2</sub> and ZnO to the raw mixture; and ii) active-BAY (18.1 wt% of α'<sub>H</sub>-belite, 42.1 wt% of b-belite, 15.8(2) wt% of alite, and 7.7(2) wt% of ye'elimite) by using optimized amounts of CaF<sub>2</sub>, ZnO and B<sub>2</sub>O<sub>3</sub>. The microscopy[P1] study has revealed that primary particle size of belite is larger (~10 µm) in the active clinker than in the standard one (~5 µm). Moreover, ferrite and alite have incorporated most of the Zn and F in their structures in both clinkers, while belite (b and α’<sub>H</sub> forms) has preferentially incorporated sulphur.</p>
Alite-Belite-Ye'elimite cements: effect of dopants on the clinker composition and properties
<p><strong>ABSTRACT:</strong> Clinkers with alite-belite-ye´elimite (ABY) are considered as eco-friendly cements. Clinkering (2 Kg) of two types of ABY clinkers was optimized: standard-ABY, with CaF<sub>2</sub> and ZnO as dopants (32.6 wt% alite, 30.4 wt% b-belite and 15.6 wt% ye'elimite) and αABY, with CaF<sub>2</sub>, ZnO, B<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O (14.4 wt% alite, 37.1 wt% b-belite, 18.5 wt% α'<sub>H</sub>-belite and 7.5 wt% ye'elimite). Zn and F were mainly incorporated in alite and ferrite, while S sulfur was mostly incorporated into Fluor-ellestadite, ye’elimite and, in lower percentages, in belite and ferrite, determined by EDS semi-quantitative. The effect of dopants on the hydration of the cement mortars has been tested. Thus, standard-ABY develops 29.9 MPa compressive strengths at 1 day while αABY does 16.8 MPa, mainly due to the higher amount of alite of the former. The presence of α’<sub>H</sub>-belite in αABY increases mechanical strengths at 28 days of hydration from 44.7 MPa of standard-ABY to 74.9 MPa.</p>
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