Fluid transport in cementitious matrices and materials is fundamental for many engineering and environmental applications. However, observing and measuring transport processes inside opaque porous solids, such as cement, is technically challenging. We tested the feasibility of using Positron Emission Tomography (PET) for in-situ tracking of fluid being spontaneously imbibed into cementitious matrices. We found that the I radiotracer enables tracking of the 3D spatiotemporal distribution of the fluids moving through the solid phase. Our measurements show a similar transport rate for Ordinary Portland (CEM І) and slag (CEM ІІІ/B) cement pastes. For both cement types, we found that the fluid penetration depth is proportional to . Such a relationship indicates anomalous transport and agrees with standard imbibition/sorptivity experiments. This result confirms that the method offers a reliable technique to explore transport phenomena in cementitious materials.

中文翻译：

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原位正电子发射断层扫描普通波特兰水泥和矿渣水泥中的流体传输


水泥基体和材料中的流体输送是许多工程和环境应用的基础。然而，观察和测量不透明多孔固体（例如水泥）内部的传输过程在技术上具有挑战性。我们测试了使用正电子发射断层扫描 (PET) 对自发吸入水泥基体的流体进行原位跟踪的可行性。我们发现 I 放射性示踪剂能够跟踪穿过固相的流体的 3D 时空分布。我们的测量显示普通波特兰 (CEM І) 和矿渣 (CEM ІІІ/B) 水泥浆体的传输率相似。对于两种水泥类型，我们发现流体渗透深度与 成正比。这种关系表明存在异常传输，并且与标准吸入/吸着性实验一致。该结果证实该方法为探索水泥材料中的传输现象提供了可靠的技术。