| 摘要: |
| 采用XRD，SEM/EDS，BSEM/EDS，光学显微分析和显微硬度分析等测试方法对湖北十字垭隧道工程混凝土进行了分析.结果表明：混凝土部分粗骨料含有石膏，在粗骨料中石膏与砂浆界面过渡区生成了钙矾石和碳硫硅钙石，导致混凝土开裂、界面过渡区疏松多孔，混凝土内部受到硫酸盐侵蚀破坏. |
| 关键词: 硫酸盐侵蚀 石膏 钙矾石 碳硫硅钙石 骨料 混凝土 |
| DOI：103969/j.issn1007 9629201401006 |
| 分类号: |
| 基金项目: |
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| Internal Sulfate Attack on Concrete Caused by Gypsum Bearing Aggregates |
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XING Zhishui1, DENG Min1, WANG Aiguo2, LIU Kaiwei1
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1.College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2.Anhui KeyLaboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
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| Abstract: |
| Some concrete samples taken from Shiziya tunnel in Hubei province were analyzed by XRD, SEM/EDS, BSEM/EDS, optical microscope and micro hardness device. It is shown that deterioration of concrete in the form of cracking, and decrease of cohesion and strength are caused by the internal sulfate attack caused by gypsum bearing dolomite coarse aggregates. Ettringite and thaumasite are formed in the interface transition zone between gypsum in the coarse aggregate and mortars. Therefore, the structures of the interface transition zone and the matrix are loose and porous, the micro hardness is reduced. |
| Key words: sulfate attack gypsum ettringite thaumasite aggregate concrete |
