庞贝城混凝土微观结构和吸水性的同步辐射显微层析和中子射线照相表征
Synchrotron Microtomography and Neutron Radiography Characterization of the Microstruture and Water Absorption of Concrete from Pompeii
摘要：
人们对使用先进技术来表征古罗马混凝土重新产生了兴趣。在目前的工作中，从庞贝的“Hospitium”钻取样品，并通过同步辐射显微断层扫描（uCT）和中子射线照相术进行分析，以研究微观结构，包括诱导裂缝的存在，如何影响其吸水性。水的分布和吸收率进行了定量中子照相。使用先进的成像方法从uCT结果分析了3D裂纹扩展、孔径分布和方向、弯曲度和连通性。具体表征还包括经典方法（例如，差热-热重、X射线衍射法和扫描电子显微镜）。一旦引入裂纹，观察到韧性断裂模式。与波特兰水泥砂浆/混凝土相比，庞贝样品具有相对较高的孔隙率，低连通性和相似的毛细渗透系数。此外，渗透率预测模型的基础上渗流理论和孔隙结构数据，以评估流体传输性能。
英文摘要：
There is renewed interest in using advanced techniques to characterize ancient Roman concrete. In the present work, samples were drilled from the "Hospitium" in Pompeii and were analyzed by synchrotron microtomography (uCT) and neutron radiography to study how the microstructure, including the presence of induced cracks, affects their water adsorption. The water distribution and absorptivity were quantified by neutron radiography. The 3D crack propagation, pore size distribution and orientation, tortuosity, and connectivity were analyzed from uCT results using advanced imaging methods. The concrete characterization also included classical methods (e.g., differential thermal-thermogravimetric, X-ray diffractometry, and scanning electron microscopy). Ductile fracture patterns were observed once cracks were introduced. When compared to Portland cement mortar/concrete, Pompeii samples had relatively high porosity, low connectivity, and similar coefficient of capillary penetration. In addition, the permeability was predicted from models based on percolation theory and the pore structure data to evaluate the fluid transport properties.
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