Effect of carbon nanotubes and nanofibers on autogenous shrinkage of Portland cement based binders

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Journal Title

Journal ISSN

Volume Title

School of Engineering |

Authors

Date

2014

Department

Rakennustekniikan laitos

Major/Subject

Rakennusmateriaalitekniikka

Mcode

Rak-82

Degree programme

Language

en

Pages

61

Series

Abstract

Effects of four types of carbon nanotubes and nanofibers on autogenous shrinkage of cement paste have been investigated. Device for autogenous shrinkage measurement has been set up and tests have been run for each sample for 48 hours. In addition, to support interpretation of the results, bending and compression tests, workability measurement, FE-SEM observation and X-ray diffraction analysis have been carried out. Collected data showed that carbon nanofibers and nanotube, either non-treated or functionalized, could be used to reduce autogenous shrinkage. The uniformity of their dispersion appeared to be the main factor defining their efficiency in reducing the shrinkage. Hence, suitable nanotube/fiber concentration, amount of superplasticizer and sonication time was crucial to decrease the shrinkage. Also nanotube and nanofiber surface properties had an influence on the behaviour towards autogenous shrinkage: better bonding with cement matrix enabled a better shrinkage reduction.

Description

Supervisor

Cwirzen, Andrzej

Thesis advisor

Ehrlacher, Alain

Keywords

carbon nanofibers, carbon nanotubes, autogenous shrinkage, cement paste

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Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202109018775

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