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中文摘要：
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。
英文摘要：
The process of water invasion into cracked concrete was studied by means of thermal neutron radiography technique.The results indicate that neutron radiography can achieve visualization tracing of water invasion into cracked concrete and quantification of spatial water distribution.During the process of water invasion into cracked concrete,water moves into concrete not only along the vertical direction of initial contact surface with water,but also along the horizontal direction from both sides of the crack and along the peripheral direction of the interfaces between the steel reinforcements and cement paste as well.The crack area and the interfaces between steel reinforcements and cement paste become the second water sources for further water invasion.Within the first two hours during water invasion into the cracked specimen with a crack width of 0.35 mm,the invaded water quantities estimated according to the neutron images are basically in agreement with the values measured by mass measurement of specimens.
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