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CLC number: TU502

On-line Access: 2015-01-04

Received: 2014-06-05

Revision Accepted: 2014-10-14

Crosschecked: 2014-12-18

Cited: 3

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Citations:  Bibtex RefMan EndNote GB/T7714


Jing XU


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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.1 P.38-46


Nanomechanical properties of C-S-H gel/cement grain interface by using nanoindentation and modulus mapping

Author(s):  Jing Xu, David J. Corr, Surendra P. Shah

Affiliation(s):  Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China; more

Corresponding email(s):   0610060014@tongji.edu.cn

Key Words:  Cement-based materials, Nanomechanical properties, Interface, Modulus mapping

Jing Xu, David J. Corr, Surendra P. Shah. Nanomechanical properties of C-S-H gel/cement grain interface by using nanoindentation and modulus mapping[J]. Journal of Zhejiang University Science A, 2015, 16(1): 38-46.

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author="Jing Xu, David J. Corr, Surendra P. Shah",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Nanomechanical properties of C-S-H gel/cement grain interface by using nanoindentation and modulus mapping
%A Jing Xu
%A David J. Corr
%A Surendra P. Shah
%J Journal of Zhejiang University SCIENCE A
%V 16
%N 1
%P 38-46
%@ 1673-565X
%D 2015
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1400166

T1 - Nanomechanical properties of C-S-H gel/cement grain interface by using nanoindentation and modulus mapping
A1 - Jing Xu
A1 - David J. Corr
A1 - Surendra P. Shah
J0 - Journal of Zhejiang University Science A
VL - 16
IS - 1
SP - 38
EP - 46
%@ 1673-565X
Y1 - 2015
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1400166

Investigation on the mechanical properties of cement-based materials at micron and sub-micron scales is important for understanding its overall performance. Recent progress in experimental nanomechanics opens new access to nano-engineering of cement-based composites. In this study, nanoindentation and viscoelastic modulus mapping were employed to study the interfacial properties. The interface width measured by modulus mapping was around 250 nm as compared to a rough estimation of less than 5 μm by nanoindentation, due to the fact that 2 orders of magnitude increase in spatial resolution could be achieved by modulus mapping. Both the nanoindetation and modulus mapping results indicated that the modulus of the interface falls between 60–70 GPa. The packing density in the interface was non-uniform as two peaks of value were observed for the storage modulus distribution. This interface could be regarded as a dense hydration coating around cement grains, which was less permeable and hindered the further hydration of cement.


结论:纳米压痕仅能粗略估计界面微区的尺寸及力学参量,相比之下,动态模量图的分辨率要高出2个数量级(表2),因此可获得更精确的测量值。C-S-H凝胶/水泥颗粒界面的尺寸在250 nm左右,模量值介于60 GPa和70 GPa之间。此界面区可认为是包覆水泥颗粒周围的一层紧密的水化层结构,其致密性将阻止内部水泥的进一步水化。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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