浆/集界面纳米改性的多尺度力学表征  

Multi-scale study on mechanical properties of paste/aggregate interface in nano-modified concrete

作　　者：徐晶[1] 王彬彬[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《电子显微学报》2015年第6期492-497,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.51378011)

摘　　要：通过多尺度对比研究了纳米Si O2对混凝土浆体/集料界面过渡区的力学特性的影响。宏观尺度上,测试了抗压及抗折强度指标;微观尺度上,采用纳米压痕和SEM(scanning electron microscope,SEM)对界面过渡区进行分析。结果表明:掺入纳米Si O2使界面过渡区的力学性能得到显著提高,且缩小了界面区与浆体本体间的差异,表现为浆体/集料界面过渡区更加致密。可以认为,纳米Si O2主要改善界面过渡区的脆弱结构并最终使混凝土整体力学性能得到提高。The effect of nano-SiO2 on the mechanical properties of paste/aggregate interfacial transition zone was studied at multi-scale levels. At macroscopic scale, compressive and flexural strength were tested; at microscopic scale, the interface was analyzed by nanoindentation and SEM techniques. Results showed that the mechanical properties of interface was improved significantly by adding nanoSiO2, while the gap between paste matrix and interface was narrowed down due to denslflcation effect by nano-SiO2. It was believed that the fragile structure of interface transition zone can be refined with nano-SiO2 , and the overall mechanical properties of concrete can be improved.

关 键 词：界面过渡区 纳米SIO2 纳米压痕技术 弹性模量 

分 类 号：TB383.1[一般工业技术—材料科学与工程]