Beam-hardening correction method for quantifying moisture content in cement paste based on X-ray radiography

被引：0
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作者：
Wang, Xu [1 ]
Dong, Biqin [1 ]
Feng, Xing [1 ]
Hong, Shuxian [1 ]
Huang, Xiaoming [1 ]
机构：
[1] Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen,518060, China
来源：
Construction and Building Materials | 2024年 / 421卷
关键词：
The X-ray spectrum changes while traveling through specimen; and this phenomenon; known as the beam-hardening effect; breaks the linear relationship between the intensity variety on radiographs and material thickness. In the detection of water transport in cement-based materials; this effect leads to inaccurate results of the quantitative moisture distribution inside the sample; and it is difficult to eliminate this effect by gravimetric calibration. To solve this problem; this paper proposed a calibration strategy for the attenuation coefficient curve of cement-water two-phase specimens; and provided a heuristic mathematical model for fitting the 2D attenuation coefficient surface of cement paste specimens. The experiments showed that for zones close to saturation; beam-hardening leads to an overestimation of moisture content; while for a zone with a low water content; the X-ray radiography results without correction tend to underestimate it. After correction; the method showed a quantitative result close to that of the gravimetric method; and maintained a good stability in samples of different thickness. © 2024 Elsevier Ltd;
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