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Effect of Internal Moisture and Outer Relative Humidity on Concrete Carbonation

  • With steadily rising CO2 concentrations in the ambient air and fast-changing concretecompositions with reduced clinker contents, the availability of reliable and accelerated concrete car-bonation tests is of crucial importance to design durable structures. This paper focuses on the effectsof moisture under accelerated conditions and the effects of different CO2 exposure conditions. Mor-tar prisms incorporating three different cement types were cured and stored at either 50% or 65%relative humidity (RH). Afterwards, the prisms were carbonated at different ambient humidities(50, 57 and 65%), different CO2 concentrations (0.04, 1 and 3 vol.%) and complemented by a seriesof tests at increased gas pressure (2 barg). High-resolution test methods were used to explain theunderlying carbonation mechanisms. The results show that pre-conditioning for two weeks—ascurrently suggested by the European Standard—seems to be too short because the initial inner mois-ture content severely affects the carbonation rate. Relative humidity during carbonation of 57% ledto higher carbonation rates compared to 50% and 65%. In addition, climate data needs to be period-ically (preferably permanently) recorded in research experiments and in laboratory testing to ensurefair interpretation of experimental results.

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Metadaten
Author:Charlotte ThielORCiD, Johanna Kratzer, Benedikt Grimm, Thomas Kränkel, Christoph GehlenORCiD
URN:urn:nbn:de:bvb:898-opus4-56091
DOI:https://doi.org/10.3390/civileng3040058
Parent Title (English):CivilEng
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of first Publication:2022
Publishing Institution:Ostbayerische Technische Hochschule Regensburg
Release Date:2022/12/01
Tag:accelerated carbonation; concrete; durability; moisture; relative humidity
Volume:4
Issue:3
First Page:1039
Last Page:1052
Note:
Corresponding author: Charlotte Thiel
Institutes:Fakultät Bauingenieurwesen
Fakultät Bauingenieurwesen / Labor für Baustoffe
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Gebäude und Infrastruktur
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International