| 摘要: |
| 通过高速纳米压痕技术测绘了3种水灰比（0.2、0.4和0.6）水泥净浆的弹性模量与硬度云图，引进K-medoids聚类分析方法划分水泥基材料的微观矿相，根据K-medoids聚类结果将力学性能图转化为矿相分布图，并对矿相的尺寸分布进行了统计分析.结果表明：水泥基材料主要包括多孔复合相（PP）、低密度/高密度C-S-H相（LD/HD C-S-H）、氢氧化钙相（CH）和超高性能相（UHP）等；随着水灰比的增加，PP、LD C-S-H的含量逐渐增加，HD C-S-H、UHP的含量逐渐减少；水泥石微观矿相的尺寸符合对数正态分布. |
| 关键词: 水泥基材料 纳米压痕 高速压痕绘图 聚类分析 |
| DOI：10.3969/j.issn.1007-9629.2023.05.015 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51308334） |
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| Phase Identification of Cementious Materials Based on High-Speed Nanoindentation Mapping by Cluster Analysis |
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SHAN Yuhan1,2, TIAN Dongcheng3, ZHAO Jiansheng4, CHEN Bing1,2, HOU Dongwei1,2
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1.Department of Civil Engineering， Shanghai Jiao Tong University， Shanghai 200240， China;2.Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure， Shanghai Jiao Tong University， Shanghai 200240， China;3.NO.1 Drilling Production Technology Service Company， CNPC Daqing Drilling Engineering Company， Daqing 163358， China;4.Cementing Company， Sinopec Zhongyuan Oilfield Service Corporation， Puyang 457000， China
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| Abstract: |
| The elastic modulus and hardness contours of cement pastes with water-cement ratios of 0.2， 0.4 and 0.6 were mapped by high-speed nanoindentation technology. The K-medoids cluster analysis method was introduced to identify the main microscopic mineral phases of cementitious materials. According to the K-medoids cluster results， the mechanical properties map was transformed into the mineral phase distribution map， and the size distribution of mineral phases was statistically analyzed. The results show that cementitious materials mainly contain porous composite phase （PP）， low density/ high density C-S-H phase （LD/HD C-S-H）， calcium hydroxide phase （CH） and ultra-high performance phase （UHP）. With the increase of water-cement ratio， the contents of PP and LD C-S-H gradually increase， while the contents of HD C-S-H and UHP gradually decrease. The size distribution of mineral phases accords with lognormal distribution. |
| Key words: cementitious material nanoindentation 3D-mapping cluster analysis |
