Experimental Study on Carbonation of Cement-Based Materials in Underground Engineering

被引:3
作者
Zheng, Jun [1 ,2 ]
Zeng, Gang [3 ,4 ]
Zhou, Hui [1 ,2 ]
Cai, Guanghua [5 ]
机构
[1] China Railway 11th Bur Grp Co Ltd, Wuhan 430061, Peoples R China
[2] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
[3] Hubei Univ Arts & Sci, Sch Civil Engn & Architecture, Xiangyang 441053, Peoples R China
[4] China Three Gorges Univ, Hubei Prov Engn Res Ctr Slope Habitat Construct T, Yichang 443002, Peoples R China
[5] Nanjing Forestry Univ, Sch Civil Engn, Nanjing 210037, Peoples R China
基金
中国国家自然科学基金;
关键词
diversion tunnel; corrosion; cement-based materials; carbonation; experimental study; WELL CEMENT; CO2; ATTACK; EVOLUTION; WATER; DEGRADATION; RESISTANCE; CONCRETE; ASH;
D O I
10.3390/ma15155238
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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.
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页数:19
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