Abstract Cementitious material is a vital composite for infrastructure, its 3D pore-structure determines its cement hydration as well as structural performance. However, the quantitative characterization of 3D pore-structure has yet been investigated in depth. In this study, the 3D pore-structure in hardened cement-paste is investigated systematically using innovative experiment and simulation methods. The experiment implements nano X-ray techniques combined with metal centrifugation porosimetry (X-MCP) for visualizing the 3D pore-structure and compared to that obtained by CEM3D-based model. The 3D pore-structure parameters containing the critical pore-diameter (dc) and porosity by X-MCP and CEM3D are counted and compared to those by mercury intrusion porosimetry (MIP). The results show that the dc values by X-MCP and CEM3D are both higher than those by MIP, and the porosity values obtained by the three methods agree with each other.

中文翻译：

---

使用金属离心孔隙率测定法和模拟研究胶凝材料中的三维孔结构

摘要 胶结材料是基础设施的重要复合材料，其3D孔隙结构决定了其水泥水化和结构性能。然而，3D 孔隙结构的定量表征尚未深入研究。在这项研究中，使用创新的实验和模拟方法系统地研究了硬化水泥浆中的 3D 孔隙结构。该实验采用纳米 X 射线技术与金属离心孔隙率测定法 (X-MCP) 相结合，用于可视化 3D 孔结构，并与通过基于 CEM3D 的模型获得的结构进行比较。通过 X-MCP 和 CEM3D 计算包含临界孔径 (dc) 和孔隙率的 3D 孔结构参数，并与压汞孔隙率法 (MIP) 进行比较。