Transmission micro-focus X-ray radiographic measurements towards in-situ tracing capillary imbibition fronts and paths in ultra-thin concrete slices
Transmission micro-focus X-ray radiographic measurements towards in-situ tracing capillary imbibition fronts and paths in ultra-thin concrete slices
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透射微焦点 X 射线射线照相测量，用于原位追踪超薄混凝土切片中的毛细管吸入前沿和路径
DOI：
10.1016/j.measurement.2021.109141
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发表时间：
2021-04
期刊：
影响因子：
5.6
通讯作者：
Dongming Yan
中科院分区：
文献类型：
--
作者：
Qiang Zeng;Xiaohu Wang;Rijiao Yang;Nidu Jike;Yu Peng;Jiyang Wang;Ye Tian;Chunsheng Zhou;Shaoqin Ruan;Dongming Yan
在本研究中，我们试图通过控制试样尺寸和吸胀液体在透射微聚焦x射线摄影试验中追踪混凝土中的吸胀前沿和路径。专门制备超薄混凝土试件进行二维渗滤。采用CsCl作为增强x射线衰减剂。采用SEM/BSE/EDS检测局部部位的微观形貌和元素分布。实验结果表明，所设计的实验能够获得对比度增强的x射线衰减图像，有助于识别混凝土中的毛细吸吸路径和前缘。液体更容易穿透界面过渡区和高孔隙水泥浆体。CsCl溶液还增加了疯牛病图像的对比度梯度。碳、氯在吸胀前缘逐渐分布。所提出的测量方法提供了一种即时、连续和直观地探测混凝土和其他多孔材料中的毛细管吸附性的方法。
In the present study, we attempted to trace the imbibition fronts and paths in concrete by controlling specimen dimensions and imbibition liquids in transmission microfocus X-ray radiographic tests. Ultra-thin concrete specimens were specifically prepared for 2D imbibitions. CsCl was used as the agent to enhance X-ray attenuation. SEM/BSE/EDS tests were used to measure the micro morphology and element distributions at local sites. Results show that the designed experiments enable the acquisition of X-ray attenuation images with the enhanced contrast, which helps identify the capillary imbibition paths and fronts in the concrete. Liquid is more likely to penetrate through the interfacial transition zone and highly porous cement paste. CsCl solution also increases the contrast gradient of BSE images. Cs and Cl gradually distribute across the imbibition fronts. The proposed measurements offer a way to instantly, continually and visually probe capillary imbibitions in concrete and other porous materials.
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