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清华大学学报(自然科学版)  2017, Vol. 57 Issue (8): 845-850    DOI: 10.16511/j.cnki.qhdxxb.2017.22.048
  水利水电工程 本期目录 | 过刊浏览 | 高级检索 |
乌东德大坝水工混凝土层间强度及层面处理改进措施
许文彬, 胡昱, 李庆斌
清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084
Interlayer strength of hydraulic concrete and layer surface treatment improvementin Wudongde Dam
XU Wenbin, HU Yu, LI Qingbin
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
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摘要 水工混凝土在干燥多风环境下浇筑时,浇筑坯层层面将受到环境影响,层间劈拉强度也会随之减小。为了分析混凝土层间劈拉强度在环境影响下的性能变化及研究层面状态的判断方法,对不同水工混凝土材料在不同环境影响下的层间劈拉强度、下层混凝土内含水量进行了相关试验研究。研究结果表明:在干燥多风的环境影响下层间劈拉强度衰减会加剧,层间劈拉强度与下层含水量存在对应的函数关系,含水量可作为预测层间强度的指标。针对下层混凝土表面更易出现缺水等极端情况,提出了层面重塑方法,该方法可明显提高层间强度。
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许文彬
胡昱
李庆斌
关键词 水工混凝土层间强度层面重塑含水量    
Abstract:Concrete pouring layer surfaces are seriously affected by the environment when hydraulic concrete pours in dry, windy environments which affects the interlayer strength. The effect of the concrete interlayer surface is analyzed for various environmental conditions by measuring the interlayer splitting tensile strength and the water content of the first concrete layer. The results show that the interlayer strength is reduced by the environmental conditions with the interlayer strength related to the water content in the first layer. Therefore, the water content can be used to predict interlayer strength. A layer remodeling method is proposed to improve the interlayer strength based on the extreme situation of a water shortage on concrete surface of the first layer surface.
Key wordshydraulic concrete    interlayer strength    layer remodeling    water content
收稿日期: 2017-02-28      出版日期: 2017-08-23
ZTFLH:  TV431  
通讯作者: 李庆斌,教授,E-mail:qingbinli@mail.tsinghua.edu.cn     E-mail: qingbinli@mail.tsinghua.edu.cn
引用本文:   
许文彬, 胡昱, 李庆斌. 乌东德大坝水工混凝土层间强度及层面处理改进措施[J]. 清华大学学报(自然科学版), 2017, 57(8): 845-850.
XU Wenbin, HU Yu, LI Qingbin. Interlayer strength of hydraulic concrete and layer surface treatment improvementin Wudongde Dam. Journal of Tsinghua University(Science and Technology), 2017, 57(8): 845-850.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.22.048  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I8/845
  表1 一级配灰水泥混凝土配合比
  图1 常态混凝土层间劈拉强度 (水灰比0.45,温度20℃,湿度45%)
  图2 碾压混凝土层间劈拉强度 (水灰比0.45,温度20℃,湿度45%)
  图3 常态混凝土试样内总含水量变化 (水灰比0.45,温度20℃,湿度45%)
  图4 碾压混凝土试样内总含水量变化 (水灰比0.45,温度20℃,湿度45%)
  图5 混凝土层间强度与下层含水量关系
  图6 混凝土表层和内部水分系数变化对比
  图7 密封情况下层面重塑对层间劈拉强度的影响
  图8 两种层面养护方式下层面重塑对层间劈拉强度的影响 (温度20℃,湿度45%,无风)
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