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.
Author: | Charlotte ThielORCiD, Johanna Kratzer, Benedikt Grimm, Thomas Kränkel, Christoph GehlenORCiD |
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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 |