ABSTRACT This article investigates the use of photon attenuating inclusions (PAI) for enhancing radiographic imaging of cementitious materials in composite structures. By targeting characteristic high attenuation regions in the photon energy spectrum, PAI can improve void detection in the parent material by increasing contrast in radiographic images. Radiographic imaging of cementitious grout specimens with 5% and 15% weight fractions of candidate PAI materials (Fe, BaCO3, BaSO4) was performed to characterize X-ray attenuation. Virtual radiography simulations were then conducted to evaluate the application of PAI to grout void detection in post-tensioned concrete construction. The simulations demonstrate that grout void detection is most effective when the high energy region of the emission spectrum is near the K-edge of the PAI material.

中文翻译：

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增强具有光子衰减夹杂物的复合结构中胶结材料的射线成像

摘要 本文研究了使用光子衰减夹杂物 (PAI) 来增强复合结构中胶结材料的射线成像。通过瞄准光子能谱中特征性的高衰减区域，PAI 可以通过增加射线图像的对比度来改善母材中的空隙检测。对具有 5% 和 15% 重量分数的候选 PAI 材料（Fe、BaCO3、BaSO4）的水泥浆试样进行射线照相成像，以表征 X 射线衰减。然后进行虚拟射线照相模拟以评估 PAI 在后张混凝土施工中的灌浆空隙检测中的应用。模拟表明，当发射光谱的高能量区域靠近 PAI 材料的 K 边缘时，灌浆空隙检测最有效。