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采用热中子辐射成像技术,对开裂混凝土中的水分侵入过程进行了试验研究与特征分析。结果表明:中子成像能够突破混凝土材料的非透明性局限,实现对开裂混凝土中水分侵入过程的可视化追踪和水分空间分布的定量计算;水分在开裂混凝土中不仅由与水初始接触面沿垂直方向推进,而且还沿裂缝两侧向其水平方向,以及钢筋与水泥基体界面外围方向同时入侵;裂缝区和钢筋与水泥基体界面区成为水分持续侵入的二次水源;水分侵入初期约2h内,根据试验中裂缝宽度为0.35mm试件的中子图像估算的水分侵入量与称量法测得的水分侵入量基本一致。
Thermal neutron radiation imaging technology was used to study the moisture intrusion process of cracked concrete and its characteristics. The results show that neutron imaging can not only overcome the non-transparency of concrete materials, but also can realize the visualization of moisture intrusion process and the quantitative calculation of water distribution in the cracked concrete. The moisture content in the cracked concrete not only depends on the vertical contact with the water, But also along both sides of the crack to its horizontal direction, and the rebar and the cement matrix interface at the same time the direction of the outer periphery of the invasion; crack zone and steel and cement substrate interface area as a continuous invasion of water secondary water; water invade the initial period of about 2h, In the experiment, the estimated moisture invasion amount of the neutron images of the specimen with the crack width of 0.35mm was basically the same as the water intrusion measured by the weighing method.