| Title: | Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rock |
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| Authors: | ID Kavčič, Nika (Author)
ID Tominc, Sara (Author)
ID Žibret, Lea (Author)
ID Žibret, Gorazd (Author)
ID Kolar, Mitja (Author)
ID Ducman, Vilma (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.1016/j.ceramint.2025.07.109
 PDF - Presentation file, download (5,06 MB)
MD5: 41E15CE17DF55932920091DD264EF188
URL - Research data, visit http://hdl.handle.net/20.500.12556/DiRROS-22772
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | Carbon capture plays an important role in the decarbonation of the building sector. One way to capture carbon is through mineral carbonation, in which Ca and Mg compounds react with CO2 to form stable carbonate minerals such as calcite, dolomite, magnesite and/or siderite, permanently sequestering CO2. Various techniques are available to measure the amount of permanently bound CO2 and quantify the carbonation potential. The suitability and accuracy of a particular method are very important, as the accurate determination of CO2 is crucial to correctly assess the sequestration potential of different materials. This study compares the three methods: calcimetric, gravimetric and thermogravimetric analysis used for CO2 determination in different types of ash, slag and natural rock. While the CO2 content in natural rock is stable, the CO2 content in slag and ash can change over time as the contained minerals gradually absorb CO2 (by natural or accelerated carbonation) until they are fully carbonated. To avoid errors in testing the CO2 uptake, as-received samples were first exposed to the full carbonation process and then tested. The comparison of calcimeter, thermogravimetric and gravimetric analysis of ground and sieved samples with a particle size below 125 μm shows that the results usually differ by less than 2 %. Higher deviations could be caused by non-carbonate minerals (especially in slags) that can react with hydrochloric acid during the calcimetric and gravimetric tests and/or decompose in the range where carbonates decompose, contributing to inaccurate CO2 measurements. The measurement uncertainty was calculated for all three quantitative methods to allow a practical comparability. |
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| Keywords: | CO2 sequestration, ash, slags, natural rocks, TGA, calcimetry, measurement uncertainty |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 10.07.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 43786-43795 |
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| Numbering: | iss. 25, part A |
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| PID: | 20.500.12556/DiRROS-23870  |
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| UDC: | 54 |
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| ISSN on article: | 1873-3956 |
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| DOI: | 10.1016/j.ceramint.2025.07.109 |
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| COBISS.SI-ID: | 242372099 |
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| Copyright: | © 2025 The Authors |
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| Publication date in DiRROS: | 15.10.2025 |
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| Views: | 297 |
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| Downloads: | 177 |
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