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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (4): 727-732    DOI: 10.3785/j.issn.1008-973X.2021.04.015
土木工程     
X射线透射成像技术原位追踪混凝土吸水过程
王小虎(),吉克尼都,陈珊,祁宇轩,彭宇,曾强*()
浙江大学 建筑工程学院，浙江 杭州 310058
Water imbibition in concrete in-situ traced by transmission X-ray radiography
Xiao-hu WANG(),Ni-du JIKE,Shan CHEN,Yu-xuan QI,Yu PENG,Qiang ZENG*()
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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摘要：

为了表征二维混凝土的传输过程，制备厚度为1 mm的混凝土薄片. 采用X射线透射成像（TXR）技术，联合扫描电镜、背散射和能谱分析技术（SEM/BSE/EDS）原位追踪水在2维混凝土薄片中的毛细自吸过程. 测试不同质量分数CsCl溶液对X射线透射图像的增强效果. 结果表明，CsCl能够提高吸水过程中混凝土薄片的TXR图像对比度，使得水在混凝土中的渗流路径更清晰、可辨. 水泥浆体在吸收CsCl后，扫描电子背散射图像的对比度显著增强. 不同位置铯原子的EDS能谱结果验证了TXR技术确定吸水前锋位置的准确性.
关键词： X射线透射成像;  混凝土;  吸水;  扫描电镜(SEM)/能谱(EDS)    
Abstract:

Concrete slices with the thickness of 1 mm were fabricated in order to characterize the two-dimensional (2D) water transport process. Transmission X-ray radiography (TXR) was combined with scanning electron microscopy/back-scattered electron/energy-dispersive X-ray spectroscopy (SEM/BSE/EDS) to in-situ trace water imbibitions in the two-dimensional concrete slices. CsCl solutions at different mass fractions were tested to explore the enhancements in contrast of the TXR images. Results show that CsCl can improve the contrast of the TXR images when the concrete slices were partially saturated with the CsCl solutions, which makes the imbibition paths and fronts in the concrete clearly visible. The contrast of the BSE images was enhanced due to the absorption of CsCl in the cement paste. The EDS results of the Cs distributions at different sites of the concrete testified the accuracy of the imbibition fronts detected by TXR.
Key words: transmission X-ray radiography    concrete    water imbibition    scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDS)
收稿日期: 2020-04-01 出版日期: 2021-05-07
CLC:  TU 528  
基金资助: 国家自然科学基金资助项目(51878602)
通讯作者: 曾强     E-mail: 21712176@zju.edu.cn;cengq14@zju.edu.cn
作者简介: 王小虎(1994—)，男，硕士生，从事损伤混凝土水分动态迁移过程的研究. orcid.org/0000-0003-2832-4536.E-mail： 21712176@zju.edu.cn
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王小虎
吉克尼都
陈珊
祁宇轩
彭宇
曾强

引用本文:

王小虎,吉克尼都,陈珊,祁宇轩,彭宇,曾强. X射线透射成像技术原位追踪混凝土吸水过程[J]. 浙江大学学报(工学版), 2021, 55(4): 727-732.

Xiao-hu WANG,Ni-du JIKE,Shan CHEN,Yu-xuan QI,Yu PENG,Qiang ZENG. Water imbibition in concrete in-situ traced by transmission X-ray radiography. Journal of ZheJiang University (Engineering Science), 2021, 55(4): 727-732.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.04.015    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I4/727

ww /wc mc /kg mw /kg ms /kg mcoa /kg
0.45 422 190 549 1165
表 1  单位立方米混凝土配比
图 1  混凝土切片吸水试验的现场图片
图 2  混凝土切片未吸水和吸水90 min后的图像
图 3  混凝土切片毛细吸收质量分数为3%、6%、9%、12%、15%和18%的CsCl溶液前、后的TXR图像对比
图 4  混凝土薄片自吸过程的TXR动态图像（每隔30 min取样）和局部区域的对比图像
图 5  混凝土薄片自吸前锋动态侵入过程（CsCl质量分数为15%）
图 6  混凝土切片的SEM/BSE/EDS测试结果（吸收时间为165 min，CsCl质量分数为15%）
图 7  混凝土切片EDS线扫结果：从未吸收区域到吸收区域（吸收时间为165 min，CsCl质量分数为15%）
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