Nanoscratch study of the modification effects of nanoSiO2 on C-S-H gel/cement grain interfaces

Jing Xu; David J. Corr; Surendra P. Shah

doi:10.1061/(ASCE)MT.1943-5533.0001930

Nanoscratch study of the modification effects of nanoSiO₂ on C-S-H gel/cement grain interfaces

Jing Xu^*, David J. Corr, Surendra P. Shah

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The modification effects of nanoSiO₂ on properties of the interface region between cement grain and C- S- H gel in cement-based composites are investigated by means of the nanoscratch technique. The nanoscratch test involves driving a Berkovich diamond tip across the interface boundary perpendicularly and recording the lateral force while the normal load applied to the indenter is kept constant. The coefficient of friction (COF), defined as the ratio of lateral force to normal load, indicates an interfacial width close to 200 nm, which is irrelevant to the addition of nanoSiO₂. However, the COF value within the interface region decreases significantly if nanoSiO₂ is incorporated. The decreased friction between the indenter and the interface is mainly attributed to the reduction of adhesion friction, because the addition of nanoSiO₂ has a densification effect on the interface. This study further confirms that nanoSiO₂ addition is beneficial for the formation of a denser layer surrounding the unhydrated cement particles in early hydration ages.

Original language	English (US)
Article number	04017093
Journal	Journal of Materials in Civil Engineering
Volume	29
Issue number	9
DOIs	https://doi.org/10.1061/(ASCE)MT.1943-5533.0001930
State	Published - Sep 1 2017

Funding

The authors would like to acknowledge financial support for this study from the National Natural Science Foundation of China (51378011). This work made use of the EPIC and NIFTI facility (NUANCE Center, Northwestern University), which has received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center, the Nanoscale Science and Engineering Center (EEC-0118025/003)-both programs of the National Science Foundation-the State of Illinois, and Northwestern University.

Keywords

Cement-based materials
Interface
NanoSiO
Nanoscratch

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science
Mechanics of Materials

Access to Document

10.1061/(ASCE)MT.1943-5533.0001930

Cite this

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title = "Nanoscratch study of the modification effects of nanoSiO2 on C-S-H gel/cement grain interfaces",

abstract = "The modification effects of nanoSiO2 on properties of the interface region between cement grain and C- S- H gel in cement-based composites are investigated by means of the nanoscratch technique. The nanoscratch test involves driving a Berkovich diamond tip across the interface boundary perpendicularly and recording the lateral force while the normal load applied to the indenter is kept constant. The coefficient of friction (COF), defined as the ratio of lateral force to normal load, indicates an interfacial width close to 200 nm, which is irrelevant to the addition of nanoSiO2. However, the COF value within the interface region decreases significantly if nanoSiO2 is incorporated. The decreased friction between the indenter and the interface is mainly attributed to the reduction of adhesion friction, because the addition of nanoSiO2 has a densification effect on the interface. This study further confirms that nanoSiO2 addition is beneficial for the formation of a denser layer surrounding the unhydrated cement particles in early hydration ages.",

keywords = "Cement-based materials, Interface, NanoSiO, Nanoscratch",

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AU - Corr, David J.

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N2 - The modification effects of nanoSiO2 on properties of the interface region between cement grain and C- S- H gel in cement-based composites are investigated by means of the nanoscratch technique. The nanoscratch test involves driving a Berkovich diamond tip across the interface boundary perpendicularly and recording the lateral force while the normal load applied to the indenter is kept constant. The coefficient of friction (COF), defined as the ratio of lateral force to normal load, indicates an interfacial width close to 200 nm, which is irrelevant to the addition of nanoSiO2. However, the COF value within the interface region decreases significantly if nanoSiO2 is incorporated. The decreased friction between the indenter and the interface is mainly attributed to the reduction of adhesion friction, because the addition of nanoSiO2 has a densification effect on the interface. This study further confirms that nanoSiO2 addition is beneficial for the formation of a denser layer surrounding the unhydrated cement particles in early hydration ages.

AB - The modification effects of nanoSiO2 on properties of the interface region between cement grain and C- S- H gel in cement-based composites are investigated by means of the nanoscratch technique. The nanoscratch test involves driving a Berkovich diamond tip across the interface boundary perpendicularly and recording the lateral force while the normal load applied to the indenter is kept constant. The coefficient of friction (COF), defined as the ratio of lateral force to normal load, indicates an interfacial width close to 200 nm, which is irrelevant to the addition of nanoSiO2. However, the COF value within the interface region decreases significantly if nanoSiO2 is incorporated. The decreased friction between the indenter and the interface is mainly attributed to the reduction of adhesion friction, because the addition of nanoSiO2 has a densification effect on the interface. This study further confirms that nanoSiO2 addition is beneficial for the formation of a denser layer surrounding the unhydrated cement particles in early hydration ages.

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