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Influence of Exposure Conditions on the Carbonation and Durability of ISSA-Modified Cementitious Materials Cover

Influence of Exposure Conditions on the Carbonation and Durability of ISSA-Modified Cementitious Materials

Open Access
|Mar 2026

Abstract

This study explores how exposure conditions affect the carbonation process of cementitious materials that include incinerated sewage sludge ash (ISSA), to evaluate ISSA’s potential as a sustainable additive in cement-based construction materials and its role in CO₂ sequestration. Hardened cement pastes with different amounts of ISSA (0 %, 20 %, 25 %, 30 %, and 35 %) were subjected to two carbonation experiments: indoor and outdoor in a natural environment. The carbonation process was tracked using phenolphthalein tests, scanning electron microscopy (SEM-EDS), X-ray diffraction (XRD), and calcium carbonate content measurement. Results show that ISSA-modified cement pastes have increased carbonation potential, especially at 20–25 % ISSA, with a rise in CaCO₃ formation and diverse calcite morphologies. However, higher ISSA levels (>30 %) led to decreased carbonation efficiency. The outdoor experiment revealed the significant influence of temperature and humidity changes on carbonation rates, resulting in slower CO₂ absorption compared to laboratory conditions.

DOI: https://doi.org/10.2478/rtuect-2026-0015 | Journal eISSN: 2255-8837 | Journal ISSN: 1691-5208
Language: English
Page range: 216 - 231
Submitted on: Dec 20, 2025
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Accepted on: Mar 17, 2026
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Published on: Mar 28, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2026 Monika Kasina, Adam Wierzbicki, Agnieszka Sulikowska, Ewelina Rashid, published by Riga Technical University
This work is licensed under the Creative Commons Attribution 4.0 License.