20.500.12556/DiRROS-23870 Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rock 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. CO2 sequestration ash slags natural rocks TGA calcimetry measurement uncertainty privzem CO2 pepel žlindre naravni kamen TGA kalcimetrija merilna negotovost true false true Elsevier Angleški jezik Slovenski jezik © 2025 The Authors Neznano 2025-10-15 06:46:06 2025-10-15 06:55:10 2025-10-24 03:55:12 0000-00-00 00:00:00 2025 0 0 str. 43786-43795 part A iss. 25 Oct. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-07-10 54 1873-3956 10.1016/j.ceramint.2025.07.109 242372099 https://doi.org/10.1016/j.ceramint.2025.07.109 0 ddc41151-a981-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35404 RAZ_Kavcic_Nika_2025.pdf RAZ_Kavcic_Nika_2025.pdf 1 41E15CE17DF55932920091DD264EF188 7c5dbf87ed4adea0591d0feb444453540b9e1e80e3185bbc38d5c13f7fb22b6d e1e03065-a982-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35405 http://hdl.handle.net/20.500.12556/DiRROS-22772 0 f8b46ebc-a982-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35406 Zavod za gradbeništvo Slovenije Dataset for the article Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rock 0 0 0