On nano/micro-mechanical characterisation of early aged cement paste

Wenzhong Zhu; Torsten Howind; Svetlana  Guriyanova; Bernd  Kummerling; Sebastian  Seufert

On nano/micro-mechanical characterisation of early aged cement paste

Wenzhong Zhu, Torsten Howind, Svetlana Guriyanova, Bernd Kummerling, Sebastian Seufert

School of Computing, Engineering and Physical Sciences

Research output: Contribution to conference › Paper › peer-review

Abstract

The present paper summarises recent achievements and challenges discovered in the field of sample preparation and micromechanical characterisation of early aged Portland cement paste hydrated for 24 hours. Specimen preparation to preserve the weak and fragile microstructure (result of the low degree of hydration), and measures to identify and prevent restart of hydration on specimen surface during nano/micro-mechanical characterisation are discussed. It is shown that growth of hydration phases on well-polished specimen surface could occur during the nanoindentation testing period (usually from several hours to a few days), leading to erroneous/faulty test results. We also present test results of such specimens obtained using PeakForce QNM™ technique and discuss issues related to results interpretation. Peak-force tapping atomic force microscopy enables high-speed and high-resolution DMT modulus mapping of the investigated sample.

Original language	English
Number of pages	9
Publication status	Published - 2 Dec 2018
Event	6th International Symposium on Nanotechnology in Construction - Hong Kong Science Park, Hong Kong, China Duration: 2 Dec 2018 → 5 Dec 2018 http://nicom6.hk/index/

Conference

Conference	6th International Symposium on Nanotechnology in Construction
Abbreviated title	NICOM6
Country/Territory	China
City	Hong Kong
Period	2/12/18 → 5/12/18
Internet address	http://nicom6.hk/index/

Keywords

steel slag
hydrothermal
calcium silicate hydrate
reinforcement
silicone rubber

Cite this

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title = "On nano/micro-mechanical characterisation of early aged cement paste",

abstract = "The present paper summarises recent achievements and challenges discovered in the field of sample preparation and micromechanical characterisation of early aged Portland cement paste hydrated for 24 hours. Specimen preparation to preserve the weak and fragile microstructure (result of the low degree of hydration), and measures to identify and prevent restart of hydration on specimen surface during nano/micro-mechanical characterisation are discussed. It is shown that growth of hydration phases on well-polished specimen surface could occur during the nanoindentation testing period (usually from several hours to a few days), leading to erroneous/faulty test results. We also present test results of such specimens obtained using PeakForce QNM{\texttrademark} technique and discuss issues related to results interpretation. Peak-force tapping atomic force microscopy enables high-speed and high-resolution DMT modulus mapping of the investigated sample.",

keywords = "steel slag, hydrothermal, calcium silicate hydrate, reinforcement, silicone rubber",

author = "Wenzhong Zhu and Torsten Howind and Svetlana Guriyanova and Bernd Kummerling and Sebastian Seufert",

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TY - CONF

T1 - On nano/micro-mechanical characterisation of early aged cement paste

AU - Zhu, Wenzhong

AU - Howind, Torsten

AU - Guriyanova, Svetlana

AU - Kummerling, Bernd

AU - Seufert, Sebastian

PY - 2018/12/2

Y1 - 2018/12/2

N2 - The present paper summarises recent achievements and challenges discovered in the field of sample preparation and micromechanical characterisation of early aged Portland cement paste hydrated for 24 hours. Specimen preparation to preserve the weak and fragile microstructure (result of the low degree of hydration), and measures to identify and prevent restart of hydration on specimen surface during nano/micro-mechanical characterisation are discussed. It is shown that growth of hydration phases on well-polished specimen surface could occur during the nanoindentation testing period (usually from several hours to a few days), leading to erroneous/faulty test results. We also present test results of such specimens obtained using PeakForce QNM™ technique and discuss issues related to results interpretation. Peak-force tapping atomic force microscopy enables high-speed and high-resolution DMT modulus mapping of the investigated sample.

AB - The present paper summarises recent achievements and challenges discovered in the field of sample preparation and micromechanical characterisation of early aged Portland cement paste hydrated for 24 hours. Specimen preparation to preserve the weak and fragile microstructure (result of the low degree of hydration), and measures to identify and prevent restart of hydration on specimen surface during nano/micro-mechanical characterisation are discussed. It is shown that growth of hydration phases on well-polished specimen surface could occur during the nanoindentation testing period (usually from several hours to a few days), leading to erroneous/faulty test results. We also present test results of such specimens obtained using PeakForce QNM™ technique and discuss issues related to results interpretation. Peak-force tapping atomic force microscopy enables high-speed and high-resolution DMT modulus mapping of the investigated sample.

KW - steel slag

KW - hydrothermal

KW - calcium silicate hydrate

KW - reinforcement

KW - silicone rubber

M3 - Paper

T2 - 6th International Symposium on Nanotechnology in Construction

Y2 - 2 December 2018 through 5 December 2018

ER -

On nano/micro-mechanical characterisation of early aged cement paste

Abstract

Conference

Keywords

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