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环境相对湿度与再生混凝土骨料初始含水量对碳化反应改善性能的协同效应

Synergistic Effects of Environmental Relative Humidity and Initial Water Content of Recycled Concrete Aggregate on the Improvement in Properties via Carbonation Reactions.

作者信息

Wu Linjian, Zhang Wenxiao, Jiang Han, Ju Xueli, Guan Li, Liu Haicheng, Chen Songgui

机构信息

National Engineering Research Center for Inland Waterway Regulation, School of River and Ocean Engineering, Chongqing Jiaotong University, 66 Xuefu Road, Nan'an District, Chongqing 400074, China.

Sichuan Communication Surveying & Design Institute Co., Ltd., Taisheng Bei Road, Qingyang District, Chengdu 610017, China.

出版信息

Materials (Basel). 2023 Jul 26;16(15):5251. doi: 10.3390/ma16155251.

DOI:10.3390/ma16155251
PMID:37569954
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10419608/
Abstract

Moisture is the basis of CO 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 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 had good abilities to permeate and diffuse, with the improvement in CRCA properties achieving excellent levels of performance.

摘要

水分是水泥基材料内部孔隙中二氧化碳传输和碳化反应的基础。水分过多或过少都会影响二氧化碳对再生混凝土骨料（RCA）碳化改性的效果。在RCA的碳化反应过程中，水分主要来源于环境相对湿度（RH）和RCA自身的初始含水量（IWC）。根据现有文献，大多数关于水分对RCA碳化改性影响的研究只考虑了RH或IWC。因此，需要进一步研究RH和IWC对碳化再生混凝土骨料（CRCA）性能改善的协同作用。在本研究中，对不同IWC的RCA样品在不同环境RH下进行了加速碳化试验。结果表明，对于干燥状态的IWC，CRCA性能改善的最佳湿度条件为RH = 70%；对于饱和状态的IWC，最佳湿度条件为RH = 50%。当RCA在高RH低IWC和低RH高IWC条件下碳化时，二氧化碳具有良好的渗透和扩散能力，CRCA性能的改善达到了优异的水平。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/7bd64f0784ea/materials-16-05251-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/eb3177b11f74/materials-16-05251-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/9a6403a2e44a/materials-16-05251-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/781adef0e6c6/materials-16-05251-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/c998bb3d21f3/materials-16-05251-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/ecb3b40840dd/materials-16-05251-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/805f93e6d2cf/materials-16-05251-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/4a7405f45754/materials-16-05251-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/7bd64f0784ea/materials-16-05251-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/eb3177b11f74/materials-16-05251-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/cd855b0752bd/materials-16-05251-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/9a6403a2e44a/materials-16-05251-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/781adef0e6c6/materials-16-05251-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/c998bb3d21f3/materials-16-05251-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/ecb3b40840dd/materials-16-05251-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/805f93e6d2cf/materials-16-05251-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/4a7405f45754/materials-16-05251-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/690b/10419608/7bd64f0784ea/materials-16-05251-g009.jpg

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本文引用的文献

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Removal of atmospheric CO by engineered soils in infrastructure projects.基础设施项目中工程土壤对大气中二氧化碳的去除。
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