Experimental Study on Carbonation of Cement-Based Materials in Underground Engineering
文献类型：期刊论文
| 作者 | Zheng, Jun; Zeng, Gang; Zhou, Hui; Cai, Guanghua |
| 刊名 | MATERIALS
 |
| 出版日期 | 2022-08-01 |
| 卷号 | 15期号:15 |
| 关键词 | diversion tunnel corrosion cement-based materials carbonation experimental study |
| 英文摘要 | The corrosive water environment has a decisive influence on the durability of a diversion tunnel lining. In this paper, the effects of carbonation on cement-based materials in water-immersion and saturated-humidity environments were studied by increasing the CO2 concentration. The results show that under conditions of water-immersion and saturated humidity, the color of the non-carbonation region is dark, while the carbonation region is gray, and the color boundary is obvious. However, in an atmospheric environment, there is no zone with a dark color and the color boundary is not obvious. In a saturated-humidity environment, the carbonation depth increases over time and changes greatly, and its value is about 16.71 mm at 200 days. While in a water-immersion environment, the carbonation depth varies little with time and the value is only 2.31 mm. The carbonation depths of cement mortar samples in different environments generally follow a linear relationship with the square root of time. The carbonation coefficient in a saturated-humidity environment is more than nine times that in the water-immersion environment. In a water-immersion environment, the carbonation causes a large loss of calcium in cement-based materials, and their Ca/Si ratio obviously decreases. The calcium silicon ratio (Ca/Si) of cement-based materials in a water-immersion environment is 0.11, which is much less than 1.51 in a water-saturated environment and 1.49 in an atmospheric environment. In a saturated-humidity environment, the carbonation only reduces the pH of the pore solution in the carbonation region, and the structural stability of cement-based materials is not degraded. The number of pores of all radii after carbonation in a water-immersion environment exceeds that in a saturated-humidity environment, and the total pore volume and average pore radius in a water-immersion environment are also larger than in a saturated-humidity environment, so the water-immersion environment accelerates the development and expansion of pores. The research results can provide some theoretical and technical support for the design, construction, and safe operation of diversion tunnel linings. |
| 学科主题 | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000838916700001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35456]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Hubei University of Arts & Science; 2.Nanjing Forestry University 3.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 4.China Three Gorges University; |
| 推荐引用方式 GB/T 7714 | Zheng, Jun,Zeng, Gang,Zhou, Hui,et al. Experimental Study on Carbonation of Cement-Based Materials in Underground Engineering[J]. MATERIALS,2022,15(15). |
| APA | Zheng, Jun,Zeng, Gang,Zhou, Hui,&Cai, Guanghua.(2022).Experimental Study on Carbonation of Cement-Based Materials in Underground Engineering.MATERIALS,15(15). |
| MLA | Zheng, Jun,et al."Experimental Study on Carbonation of Cement-Based Materials in Underground Engineering".MATERIALS 15.15(2022). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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