Evaluation and Mechanism of Leaching Resistance Technology of Primary Support Concrete for Tunnel
ZHOU Ying1,2, MU Song1,2,*, PU Chunping3, ZHOU Xiaocheng1,2, LI Yongquan3, CAI Jingshun1,2, XIE Deqing1,2
1 State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing 210008, China 2 Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 3 Guangdong Road & Bridge Construction Development Co., Ltd., Zhongshan 528463, Guangdong,China
Abstract: Primary support concrete of tunnel is deteriorated by calcium leaching, which will increase porosity, decrease strength, and shorten its service life. According to a model of calcium leaching, reducing content of soluble calcium, porosity, and water transport rate of concrete was an effective method to improve its leaching resistance. Pore structure, hydration products, and microscopic morphology of primary support concrete incorporated with mineral admixtures(AD), densifying material (nano silica, DM) and hydrophobic material (organic carboxylate polymer, HM) before and after leaching test, were measured and analyzed by using hardened bubbles, X-ray diffraction, scanning electron microscopy, energy spectrum analysis, ICP and other methods. The results showed that mineral admixtures AD reduced the content of soluble Ca(OH)2 and refined the pores of concrete to improve the leaching resistance of primary support concrete. The leaching of calcium ions in primary support concrete is 10% lower than that of pure cement after 14 days of leaching. However, due to its secondary hydration effect, the early strength of concrete decreased, which was unfavorable to the tunnel's primary concrete. The densifying material DM reduced content of Ca(OH)2 and refined pore structure of the primary support concrete, which improved the corrosion resistance of concrete and its early strength. Therefore, the amount of calcium ion leaching for the concrete added with DM at 14 days is 22% lower than that for the pure cement concrete. Hydrophobic material HM improved the anti-leaching performance of concrete from the aspects of refining concrete pores and reducing water transmission rate. The amount of calcium ion leaching for the concrete added with HM at 14 days is 30% lower than that for pure cement concrete, and it has no adverse effect on the strength of concrete. On the whole, the leaching resistance technology was listed in a descending order: hydrophobic material HM> densifying material DM> mineral admixture AD.
周莹, 穆松, 蒲春平, 周霄骋, 李勇泉, 蔡景顺, 谢德擎. 隧道初支混凝土抗冲刷溶蚀技术评价及作用机理[J]. 材料导报, 2022, 36(4): 20120200-8.
ZHOU Ying, MU Song, PU Chunping, ZHOU Xiaocheng, LI Yongquan, CAI Jingshun, XIE Deqing. Evaluation and Mechanism of Leaching Resistance Technology of Primary Support Concrete for Tunnel. Materials Reports, 2022, 36(4): 20120200-8.
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2022, Vol. 36 
