乌东德大坝水工混凝土层间强度及层面处理改进措施

发布时间：2019-04-29 16:17

【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。
[Abstract]:When the hydraulic concrete is poured in dry and windy environment, the green layer will be affected by the environment, and the splitting tensile strength will also decrease. In order to analyze the performance change of concrete interlayer splitting tensile strength under the influence of environment and the judging method of study layer state, the interlayer splitting tensile strength of different hydraulic concrete materials under different environment influence is analyzed. The water content in the understory concrete was tested and studied. The results show that in the dry and windy environment, the attenuation of split tensile strength in the lower layer will be aggravated, and there is a corresponding functional relationship between the split tensile strength and the water content in the lower layer, and the water content can be used as an index to predict the interlaminar strength. In view of the extreme situation such as water shortage on the surface of lower concrete, the method of layer remolding is put forward, which can obviously improve the interlaminar strength.
【作者单位】：清华大学水沙科学与水利水电工程国家重点实验室;
【基金】：国家“九七三”重点基础研究项目(2013CB035902) 国家自然科学基金项目(51279087,51339003) 清华大学自主科研项目(2014Z01004)
【分类号】：TV431

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