硅酸三钙硬化浆体三维空间结构的连续切片成像研究

硅酸三钙硬化浆体三维空间结构的连续切片成像研究

杨 飞¹，刘贤萍^1，2*，赵永娟¹，王培铭^1，2，陈 波^1，3*

(1. 同济大学材料科学与工程学院，上海201804；2．先进土木工程材料教育部重点实验室（同济大学），上海201804；3．工程结构性能演化与控制教育部重点实验室（同济大学），上海200092)

摘  要  本文通过连续切片扫描电子显微镜(SBFSEM)对水灰比0.6、20℃恒温密闭养护7d的硅酸三钙硬化浆体进行研究，并通过三维图像处理软件Avizo对获取的200张背散射电子（BSE）图像进行分析。结果表明，通过SBFSEM在高真空以及1 kV电压下获取的连续BSE图像经过Avizo分析处理后，获得的最小孔体积和最小未水化颗粒体积分别为3.6×10⁴  nm³和3.7×10⁴ nm³；93%的未水化硅酸三钙的体积介于3.6×10⁴ nm³和1.0×10⁷ nm³之间，88.9%的孔的体积介于3.7×10⁴ nm³和3.2×10⁶ nm³之间；三维重构所得的总孔体积占硬化浆体总体积的4.5%。

关键词  连续切片扫描电子显微镜（SBFSEM）；硅酸三钙硬化浆体；三维重构；孔体积

中图分类号：TG115.21⁺5.3；TQ172.71

文献标识码：Adoi:10.3969/j.issn.1000-6281.2020.02-006

Serial block-face imaging study of the three-dimensional structure of the hardened paste of tricalcium silicate

YANG Fei¹，LIU Xian-ping^1，2*，ZHAO Yong-juan¹，WANG Pei-ming^1，2，CHEN Bo^1，3*

（1.School of Materials Science and Engineering，Tongji University，Shanghai 201804；2. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education(Tongji University)，Shanghai 201804；3. Key Laboratory of Performance Evolution and Control for Engineering Structures, Ministry of Education(Tongji University), Shanghai 200092，China)

Abstract  Serial block-face scanning electron microscopy (SBFSEM) was used to study the hardened tricalcium silicate (C₃S) paste with water-cement ratio of 0.6 and experimented 7 days of hydration. Three-dimensional (3D) analysis of the acquired 200 slices of backscattered electron(BSE) images was performed by ImageJ and Avizo software. The results show that the unhydrated C₃S grains and pores of the epoxy embedded sample are irregular in 3D space, the minimum volume of the pores and unhydrated grains obtained by SBFSEM measurement at the high vacuum and with accelerating voltage of 1kV are 3.6×10⁴ nm³ and 3.7×10⁴ nm³, respectively. The volumes of 93% of the unhydrated C₃S grainsare between 3.6×10⁴ nm³ and 1.0×10⁷ nm³, accounts for 67.6% of the total volume of the unhydrated C₃S grains.The volumes of 88.9% of the poresare between 3.7×10⁴ nm³ and 3.2×10⁶nm³, and the total volume of the pores accounts for 4.5% of the total volume of the hardened C₃S paste.

Keywords  serial block-face scanning electron microscopy(SBFSEM)；hardened paste of theC₃S；three-dimensional reconstruction；volume of pores

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