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Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions
Moisture is the basis of CO(2) transport and carbonation reactions in the internal pores of cement-based materials. Too much or too little moisture influences the effect of the carbonation modification of CO(2) on recycled concrete aggregate (RCA). During the carbonation reaction process of RCA, moi...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10419608/ https://www.ncbi.nlm.nih.gov/pubmed/37569954 http://dx.doi.org/10.3390/ma16155251 |
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author | Wu, Linjian Zhang, Wenxiao Jiang, Han Ju, Xueli Guan, Li Liu, Haicheng Chen, Songgui |
author_facet | Wu, Linjian Zhang, Wenxiao Jiang, Han Ju, Xueli Guan, Li Liu, Haicheng Chen, Songgui |
author_sort | Wu, Linjian |
collection | PubMed |
description | Moisture is the basis of CO(2) transport and carbonation reactions in the internal pores of cement-based materials. Too much or too little moisture influences the effect of the carbonation modification of CO(2) on recycled concrete aggregate (RCA). During the carbonation reaction process of RCA, moisture is mainly derived from the environmental relative humidity (RH) and the initial water content (IWC) of the RCA itself. According to the available literature, most of the studies on the effect of moisture on the carbonation modification of RCA considered either RH or IWC. Further investigations of the synergistic effects of RH and IWC on the improvement in the properties of carbonated recycled concrete aggregate (CRCA) are needed. In this study, accelerated carbonation experiments were conducted for RCA samples with different IWCs under different environmental RHs. The results showed that the best moisture conditions for CRCA property improvement were confirmed as RH = 70% for the dry-state IWC and RH = 50% for the saturated-state IWC. When the RCAs were carbonized under the conditions of high RH with low IWC and low RH with high IWC, CO(2) had good abilities to permeate and diffuse, with the improvement in CRCA properties achieving excellent levels of performance. |
format | Online Article Text |
id | pubmed-10419608 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-104196082023-08-12 Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions Wu, Linjian Zhang, Wenxiao Jiang, Han Ju, Xueli Guan, Li Liu, Haicheng Chen, Songgui Materials (Basel) Article Moisture is the basis of CO(2) transport and carbonation reactions in the internal pores of cement-based materials. Too much or too little moisture influences the effect of the carbonation modification of CO(2) on recycled concrete aggregate (RCA). During the carbonation reaction process of RCA, moisture is mainly derived from the environmental relative humidity (RH) and the initial water content (IWC) of the RCA itself. According to the available literature, most of the studies on the effect of moisture on the carbonation modification of RCA considered either RH or IWC. Further investigations of the synergistic effects of RH and IWC on the improvement in the properties of carbonated recycled concrete aggregate (CRCA) are needed. In this study, accelerated carbonation experiments were conducted for RCA samples with different IWCs under different environmental RHs. The results showed that the best moisture conditions for CRCA property improvement were confirmed as RH = 70% for the dry-state IWC and RH = 50% for the saturated-state IWC. When the RCAs were carbonized under the conditions of high RH with low IWC and low RH with high IWC, CO(2) had good abilities to permeate and diffuse, with the improvement in CRCA properties achieving excellent levels of performance. MDPI 2023-07-26 /pmc/articles/PMC10419608/ /pubmed/37569954 http://dx.doi.org/10.3390/ma16155251 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wu, Linjian Zhang, Wenxiao Jiang, Han Ju, Xueli Guan, Li Liu, Haicheng Chen, Songgui Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title | Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title_full | Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title_fullStr | Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title_full_unstemmed | Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title_short | Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions |
title_sort | synergistic effects of environmental relative humidity and initial water content of recycled concrete aggregate on the improvement in properties via carbonation reactions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10419608/ https://www.ncbi.nlm.nih.gov/pubmed/37569954 http://dx.doi.org/10.3390/ma16155251 |
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