| 隧道喷射混凝土硫酸盐侵蚀破坏分析及对策 |
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| 引用本文： | 渠亚男,李享涛,仲新华,苏婉玉,王家赫.隧道喷射混凝土硫酸盐侵蚀破坏分析及对策[J].铁道建筑,2019(1):55-58. |
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| 作者姓名： | 渠亚男 李享涛 仲新华 苏婉玉 王家赫 |
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| 作者单位： | 中国铁道科学研究院集团有限公司铁道建筑研究所;高速铁路轨道技术国家重点实验室 |
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| 基金项目： | 中国铁路总公司科技研究开发计划(2017G007-C);中国铁道科学研究院基金(2017YJ047;2017YJ033) |
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| 摘 要： | 本文选取硫酸盐侵蚀环境下隧道喷射混凝土芯样,采用X射线衍射、红外光谱、拉曼光谱、扫描电镜、能谱分析等测试手段综合分析喷射混凝土的腐蚀产物。结果表明:该喷射混凝土侵蚀类型为碳硫硅钙石型硫酸盐侵蚀,碳硫硅钙石由溶液直接反应和钙矾石转变而成。据此提出从原材料优选、配合比优化、施工质量控制等多方面来提高喷射混凝土抗碳硫硅钙石型硫酸盐侵蚀破坏的能力。
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| 关 键 词： | 工程材料 形成机制 试验研究 喷射混凝土 隧道 硫酸盐侵蚀 碳硫硅钙石 |
Analysis of Tunnel Shotcrete Suffered from Sulfate Attack Damage and Its Countermeasures |
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| QU Yanan,LI Xiangtao,ZHONG Xinhua,SU Wanyu,WANG Jiahe.Analysis of Tunnel Shotcrete Suffered from Sulfate Attack Damage and Its Countermeasures[J].Railway Engineering,2019(1):55-58. |
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| Authors: | QU Yanan LI Xiangtao ZHONG Xinhua SU Wanyu WANG Jiahe |
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| Institution: | (Railway Engineering Research Institute,China Academy of Railway Sciences Group Co.Ltd.,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,Beijing 100081,China) |
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| Abstract: | In this paper,shotcrete core samples of a tunnel under sulfate attack environment were investigated,corrosion products of shotcrete were analyzed by using the testing measures of X-ray diffraction,IR spectrum,Raman spectrum,scanning electron microscope and energy spectrum analysis synthetically.The results show that the erosion type of shotcrete is thaumasite sulfate attack(TSA),and thaumasite is formed by direct reaction of solution and transformation of ettringite.The measures to prevent shotcrete from the TSA are proposed such as proper selection of raw materials,rational mixing proportion design,and strict controls of construction quality. |
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| Keywords: | Engineering materials Formation mechanism Experimental study Shotcrete Tunnel Sulfate attack Thaumasite |
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