Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Wu, Linjian, Zhang, Wenxiao, Jiang, Han, Ju, Xueli, Guan, Li, Liu, Haicheng, Chen, Songgui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
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
_version_ 1785088566199582720
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
work_keys_str_mv AT wulinjian synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT zhangwenxiao synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT jianghan synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT juxueli synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT guanli synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT liuhaicheng synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions
AT chensonggui synergisticeffectsofenvironmentalrelativehumidityandinitialwatercontentofrecycledconcreteaggregateontheimprovementinpropertiesviacarbonationreactions