【摘要】 敦煌莫高窟内存在大量水泥基材料，然而由于其珍贵的文物属性以及区域环境限制，采用传统方法无法对遗址地内的水泥基材料进行实验，这为今后对其进行劣化监测、使用寿命预判或去除等工作带来了挑战。本研究采用纳米压痕技术并结合扫描电镜、XRD等方法，详细分析了第335窟洞窟内水泥地面的微观结构特征和力学性能。实验结果显示，该洞窟内水泥地面的微观结构相对松散，力学性能均值为：弹性模量E=12.9GPa，硬度H=0.33 GPa，且已完全发生碳化趋于中性。该结果表明，第335窟水泥地面微观力学性能较低，并且碳化导致Ca（OH）2和C-S-H凝胶大量消失，从而使其疏松产生表面脱落现象。本研究为今后更好地监测或去除莫高窟洞窟内水泥地面提供了数据支持，并可为其他遗址地的保护研究工作提供借鉴。更多还原

【Abstract】 There are a large number of cement-based materials currently in use at the Mogao Grottoes. Considering the precious cultural properties and environmental constraints of the site,study of these materials using conventional sampling methods is quite impossible. Because the macro-mechanics and durability of the cement-based materials are determined by their micro-scale mechanisms,this study decided to utilize nanoindentation technology,scanning electron microscopes and XRD to test the floor cement in Mogao cave 335 and characterize its micro-structure characteristics and mechanical properties,so as to provide data support for the future removal of cement floors. The results of these analyses have found that the micro-mechanical properties of the cement floor in Mogao cave 335 are relatively low,that the cement materials have been completely carbonized,and that they generally tend to be neutral. Finally,the success of the study has proven that this combination of test methodology is not only accurate and easy to implement,but also safe and feasible even in the complex environment of the grottoes.更多还原