乌东德大坝水工混凝土层间强度及层面处理改进措施  

Interlayer strength of hydraulic concrete and layer surface treatment improvement in Wudongde Dam

作　　者：许文彬[1] 胡昱[1] 李庆斌[1] 

机构地区：[1]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

出　　处：《清华大学学报（自然科学版）》2017年第8期845-850,共6页Journal of Tsinghua University(Science and Technology)

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)

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。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 arid 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.

关 键 词：水工混凝土 层间强度 层面重塑 含水量 

分 类 号：TV431[水利工程—水工结构工程]