Evolution of structural and mechanical properties of concrete exposed to high concentration CO2
文献类型：期刊论文
| 作者 | Xue, Quan1,4; Zhang, Liwei1,4; Mei, Kaiyuan1,4; Wang, Lin3; Wang, Yan1; Li, Xiaochun1,4 ; Cheng, Xiaowei2; Liu, Hejuan1,4
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| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
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| 出版日期 | 2022-08-08 |
| 卷号 | 343期号:-页码:- |
| 关键词 | High concentration CO2 Concrete carbonation Compressive strength CT scan |
| ISSN号 | 0950-0618 |
| 英文摘要 | There are many natural high concentration CO2 reservoirs in the deep subsurface worldwide, and there is a potential for CO2 leakage from deep CO2 reservoirs to shallower underground spaces. As a result, underground mining and tunnel construction may encounter zones with high concentration CO2, which raises concern of concrete carbonation. Concrete carbonation under low CO2 concentration may increase the strength of concrete, but concrete carbonation under high concentration CO2 may cause concrete damage. High concentration CO2 may significantly increase the carbonation rate of concrete, which causes the strength and service life of concrete to decrease. In order to investigate the effect of CO2 concentration on concrete carbonation, this paper studied the carbonation process of concrete samples in dry gas, pure water and 70% relative humidity (RH) environments with 100 kPa, 500 kPa and 1000 kPa CO2 partial pressures. The chemical compositions, pore structure and mechanical properties of the concrete samples were also studied. The results showed that the carbonation environment affected the crystallization process of carbonation products. The existence of water increased the level of concrete carbonation in pure water environment, and some C-S-H also reacted with CO2 to produce aragonite. Therefore, after 28 d carbonation of concrete in 100 kPa CO2, aragonite existed in pure water envi-ronment but did not exist in dry gas environment. For all carbonation environments, the compressive strength of concrete increased after carbonation in 100 kPa and 500 kPa CO2, but the compressive strength of concrete first increased and then decreased in pure water and 70% RH environment with 1000 kPa CO2. In summary, if the concentration of CO2 reaches a certain level (i.e., 1000 kPa partial pressure), the CO2-induced carbonation can eventually lead to concrete damage. |
| 学科主题 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000827658800003 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35394]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2.School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China 3.Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250000, China 4.University of Chinese Academy of Sciences, Beijing 100049, China |
| 推荐引用方式 GB/T 7714 | Xue, Quan,Zhang, Liwei,Mei, Kaiyuan,et al. Evolution of structural and mechanical properties of concrete exposed to high concentration CO2[J]. CONSTRUCTION AND BUILDING MATERIALS,2022,343(-):-. |
| APA | Xue, Quan.,Zhang, Liwei.,Mei, Kaiyuan.,Wang, Lin.,Wang, Yan.,...&Liu, Hejuan.(2022).Evolution of structural and mechanical properties of concrete exposed to high concentration CO2.CONSTRUCTION AND BUILDING MATERIALS,343(-),-. |
| MLA | Xue, Quan,et al."Evolution of structural and mechanical properties of concrete exposed to high concentration CO2".CONSTRUCTION AND BUILDING MATERIALS 343.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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