UM
Molecular dynamics study on the mode I fracture of calcium silicate hydrate under tensile loading
Hou D.1; Zhao T.1; Wang P.1; Li Z.2; Zhang J.2
2014-09-21
Source PublicationEngineering Fracture Mechanics
ISSN00137944
Volume131Pages:557-569
AbstractCalcium silicate hydrate (C-S-H), the essential binder of cement based materials, is a poor crystal phase at nano-scale. In this study, crack growth mechanism is unraveled in lights of Molecular Dynamics (MD) by simulating the uniaxial tension test on the C-S-H gel with voids ranging from 0.5. nm to 5. nm. At nano-scale, the layered C-S-H gel demonstrates dual nature of crack propagation. In xy plane, the stable ionic-covalent bonds Si-O and Ca-O are hard to break so the cracks coalesce is slowed down, implying ductile characteristic. In z direction, cracks spread in the interlayer region with high rate due to the frequently breakage H-bonds network, exhibiting brittle nature. In the tensile process, the crack develops from the central void and "strain concentration" near the void boundary is induced by irreversible atomic deformation. Young's modulus and tensile strength of C-S-H gel are significantly weakened due to the presence of central void. Additionally, due to the binding constraints' discrepancy, bending of the calcium silicate sheet can be observed, reflecting the complicated tensile behavior of heterogeneous layered C-S-H gel.
KeywordCalcium silicate hydrate (C-S-H) Crack evolution DSD SCF Uniaxial tension test
DOI10.1016/j.engfracmech.2014.09.011
URLView the original
Language英語
Fulltext Access
Citation statistics
Cited Times [WOS]:20   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Qingdao University of Technology
2.Hong Kong University of Science and Technology
Recommended Citation
GB/T 7714
Hou D.,Zhao T.,Wang P.,et al. Molecular dynamics study on the mode I fracture of calcium silicate hydrate under tensile loading[J]. Engineering Fracture Mechanics,2014,131:557-569.
APA Hou D.,Zhao T.,Wang P.,Li Z.,&Zhang J..(2014).Molecular dynamics study on the mode I fracture of calcium silicate hydrate under tensile loading.Engineering Fracture Mechanics,131,557-569.
MLA Hou D.,et al."Molecular dynamics study on the mode I fracture of calcium silicate hydrate under tensile loading".Engineering Fracture Mechanics 131(2014):557-569.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Hou D.]'s Articles
[Zhao T.]'s Articles
[Wang P.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Hou D.]'s Articles
[Zhao T.]'s Articles
[Wang P.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Hou D.]'s Articles
[Zhao T.]'s Articles
[Wang P.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.