Interfacial transition zones (ITZs) of cementitious concrete are highly heterogeneous, which cause many challenges in accurately obtaining their properties. In this paper, regular aggregates were applied to prepare modelled geopolymer composites, in which ITZs exhibited neat boundaries. Nanoscratch technique with the ability to quickly scan a long distance was adopted to investigate mechanical properties of ITZ and geopolymer paste. To compare the properties of the ITZs and paste, abundant scratch data were analyzed in the form of histograms and Gaussian mixture models. The results showed that the ITZs in geopolymer with silica modulus of 1.5 presented similar properties with the paste, while the ITZs in geopolymer with silica modulus of 1.0 showed significantly higher scratch hardness but lower scratch friction coefficient than paste. Deconvolution analysis revealed that the abnormal hardness and friction coefficient of the paste in geopolymer with silica modulus of 1.0 could be caused by the defects related points. Compared with the traditional scratch scheme, the parallel scratch scheme based on modelled ITZ gave more stable results with a given number of test data, which can provide in-depth information for comparative studies.

水泥混凝土的界面过渡区 (ITZ) 是高度异质的，这给准确获取其性能带来了许多挑战。在本文中，规则骨料被用于制备模型地质聚合物复合材料，其中 ITZ 表现出整齐的边界。采用具有长距离快速扫描能力的纳米划痕技术研究了ITZ和地质聚合物糊的力学性能。为了比较 ITZ 和焊膏的特性，以直方图和高斯混合模型的形式分析了大量的划痕数据。结果表明，二氧化硅模量为1.5的地质聚合物中的ITZs表现出与糊剂相似的性能，而二氧化硅模量为1.0的地质聚合物中的ITZs的划痕硬度显着高于糊状物，但划痕摩擦系数较低。解卷积分析表明，二氧化硅模量为1.0的地质聚合物中糊状物的异常硬度和摩擦系数可能是由缺陷相关点引起的。与传统的划痕方案相比，基于建模ITZ的平行划痕方案在给定的测试数据下给出了更稳定的结果，可以为对比研究提供更深入的信息。