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  4. 小角散射技术及其在硬化水泥浆体微结构表征中的应用

硅酸盐通报 , 2009, 28(5): 959-972.

小角散射技术及其在硬化水泥浆体微结构表征中的应用

沈业青 1, , 邓敏 2, , 莫立武 3,

1.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009;安徽师范大学化学与材料科学学院,安徽省功能性分子固体重点实验室,芜湖,241000

2.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009

3.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009

基金项目:   国家重点基础研究发展规划(973计划)(2009CB623105)   国家科技支撑计划(2006BAF02A25)  

关键词： 硬化水泥浆体 , 小角散射 , 微结构 , 纳米凝胶粒子 , 分形

Small-angle Scattering Technique and Its Application in Microstructure Characterization of Hardened Cement Pastes

SHEN Ye-qing 1, , DENG Min 2, , MO Li-wu 3,

1.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009;安徽师范大学化学与材料科学学院,安徽省功能性分子固体重点实验室,芜湖,241000

2.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009

3.南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京,210009

Keywords： hardened cement paste , SAS , microstructure , nano CSH particle , fractal

概述了小角散射的基本原理,总结了小角散射数据纪尼叶(Guinier)近似处理和Porod近似处理及其应用,综述了利用小角散射技术研究硬化水泥浆体纳米凝胶粒子尺寸、凝胶粒子分形结构和孔隙孔径分布.结果表明,小角散射技术能在无破坏、无侵入条件下实时、重复表征硬化水泥浆体纳米结构特征及其演化.受到有效散射中子源获取困难、仪器投资巨大及分析测试模型过于简化等条件的影响,小角散射技术特别是中子小角散射技术在硬化水泥浆体微结构表征与应用上的研究需要不断发展和完善.

This paper summarizes the principal theory of small-angle scattering technique (SAS), including Guinier approximation, Porod approximation and function of the two approximations. Application of SAS in nano-CSH particle diameter, fractal structure of nano-CSH and pore structure distribution in hardened cement pastes is also described in the paper. Advantage of the technique is nondestructive, noninvasive, and could be used repeatedly in the real-time characterization of the microstructure and its evolution. SAS, especially small-angle neutron scattering technique (SANS), also has its limit because effective neutron source is difficult to obtain, analysis of test model is too simplistic far from real fact, and experiment is costly and non-portable.

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