项目名称: 变冻融温度下水工混凝土抗冻演变行为及寿命预测
项目编号: No.51209146
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 水利科学与海洋工程学科
项目作者: 戈雪良
作者单位: 水利部交通运输部国家能源局南京水利科学研究院
项目金额: 25万元
中文摘要: 在我国不同区域,水工混凝土经受的年冻融循环次数、冻融温度均不同,气候变化将使其经受冻融作用破坏程度的区域划分与冻融温度发生改变,按现行抗冻试验方法评价混凝土抗冻性能、并进行抗冻等级设计存在区域适用性问题,出现设计抗冻与实际受冻不符的情况。水工混凝土作为水利工程建设最核心的建筑材料之一,抗冻性能既是耐久性的重要指标,又对气候变化引发的冻融温度变化最为敏感与脆弱。本项目基于GDJS-800型气候模拟系统,设计了三种降温终了试件中心温度的冻融制度,研究变冻融中心温度下低、中、高三种抗冻设计等级水工混凝土质量损失与动弹性模量的演变行为,揭示不同抗冻设计等级水工混凝土在不同冻融制度下的抗冻耐久性演化规律这一科学问题,建立基于气候分区的水工混凝土抗冻融寿命预测新方法。项目全面揭示变冻融中心温度下水工混凝土抗冻性演变特征,为气候变化下合理设计不同区域内水工混凝土抗冻等级、提高抗冻耐久性提供理论依据。
中文关键词: 水工混凝土;变冻融温度;抗冻性能;演变行为;寿命预测
英文摘要: In different regions of China, concrete structures subjected to different freeze-thaw cycles and low temperature. The regional division of freeze-thaw and the freeze-thaw low temperature of concrete structures will change because of climate change. There is regional applicability of design antifreeze and actual cold conditions according to the current antifreeze test methods to evaluate the frost resistance of concrete and antifreeze design level. The hydraulic concrete as one of the important core building material of water conservancy construction, frost resistance is an important indicator of durability, and the most sensitive and vulnerable to freeze-thaw temperature change caused by climate change. Three kinds of freeze-thaw system with different specimen center low temperature will be designed based on GDJS-800 climate simulation system. The evolution behavior of mass loss and dynamic elastic modulus of hydraulic concrete with different antifreeze design level with be studied under variables freeze-thaw low temperature in center of concrete specimen. The scientific issues about frost durability of hydraulic concrete with different antifreeze design level in different freeze-thaw system will be revealed. And create a freeze-thaw life prediction method of hydraulic concrete about different climate zones. Thi
英文关键词: hydraulic concrete;different freezing and thawing temperature;frost resistance;evolution law;life predict