| 水下隧道工程清水混凝土外观砂斑的成因分析 |
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| 引用本文： | 姜骞,于诚. 水下隧道工程清水混凝土外观砂斑的成因分析[J]. 混凝土与水泥制品, 2021, 0(3): 20-23,27 |
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| 作者姓名： | 姜骞 于诚 |
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| 作者单位： | 江苏苏博特新材料股份有限公司 高性能土木工程材料国家重点实验室,江苏 南京 211103;江苏苏博特新材料股份有限公司 高性能土木工程材料国家重点实验室,江苏 南京 211103 |
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| 基金项目： | “十三五”国家重点研发计划战略性国际科技创新合作重点专项(2016YFE0206100);江苏省自然科学基金项目(BK20181127)。 |
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| 摘 要： | 为了研究清水混凝土外观砂斑的形成原因,对某水下隧道工程敞开段侧墙清水混凝土进行了质量调研与试验分析.结果表明:砂斑主要与混凝土用水量增加有关;原材料中粉煤灰品质的波动增加了混凝土用水量;为了在相同减水剂掺量下满足混凝土拌合物的流动性要求,大幅增加用水量造成混凝土中自由水过多,析出带走混凝土表面的胶凝材料颗粒,由此导致砂...
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| 关 键 词： | 隧道 清水混凝土 砂斑 成因 对策 用水量 |
Causes Analysis for Sand Spots on Fair-faced Concrete for Side Wall in Underwater Tunnel |
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| JIANG Qian,YU Cheng. Causes Analysis for Sand Spots on Fair-faced Concrete for Side Wall in Underwater Tunnel[J]. China Concrete and Cement Products, 2021, 0(3): 20-23,27 |
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| Authors: | JIANG Qian YU Cheng |
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| Affiliation: | (Jiangsu Sobute New Materials Co.,Ltd.,State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 211103,China) |
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| Abstract: | Aiming at a better understanding of cause of sand spots formation on fair-faced concrete for side wall in open section of some underwater tunnel,concrete construction quality on-site and experimental research within-laboratory were conducted.The results show that the concrete defect is found to be related to overuse of mixing water.To fulfill the workability of fresh concrete with same dosage of water reducer,water demand of concrete mixtures is increased for quality variation of fly ash.The excessive quantities of mixing water in the system lead to too much free water in paste.Binder particles on the surface of concrete are flushed away,and the sand spots appear.In addition,considering the cause of the defect,concrete surface quality promotion advices,including control of raw materials quality,pouring construction,and immediately curing,are put forward. |
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| Keywords: | Tunnel Fair-faced concrete Sand spot Cause Treatment Water consumption |
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