纳米-
纳米尺度
胶体
比例(比率)
材料科学
纳米技术
高分子科学
化学工程
化学物理
物理
复合材料
工程类
量子力学
作者
Enrico Masoero,Emanuela Del Gado,Pellenq Rj,Sungkit Yip,Ulm Franz-Josef
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2014-01-01
卷期号:10 (3): 491-499
被引量:69
摘要
Gels of calcium–silicate–hydrates (C–S–H) are the glue that is largely responsible for the mechanical properties of cement. Despite their practical relevance, their nano-scale structure and mechanics are still mainly unexplored, because of the difficulties in characterizing them in a complex material like cement. We propose a colloidal model to investigate the gel mechanics emerging in the critical range of length-scales from several tens to hundreds of nanometers. We show that the size polydispersity of the hydrates and size-dependent effective interactions can explain the mechanical heterogeneities detected in nano-indentation experiments. We also show how these features control the arising of irreversible structural rearrangements under deformation, which are good candidates as nano-scale mechanisms underlying mechanical aging and slow structural relaxation in the gels.
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