Effect of Carbon Nanotubes in Metakaolin-based Geopolymer Mortars on fracture toughness parameters and Acoustic Emission Signals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F15%3APU115610" target="_blank" >RIV/00216305:26110/15:PU115610 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Effect of Carbon Nanotubes in Metakaolin-based Geopolymer Mortars on fracture toughness parameters and Acoustic Emission Signals

Original language description

Since geopolymers based on metakaolin are quite brittle materials compared to ordinary cement based materials it reduces the possibility of their application as construction material. Therefore, the objective of this investigation was to improve fracture toughness of geopolymer material by the application of carbon nanotubes, which have excellent tensile properties and can act as reinforcement on the nanoscale level. The effect of carbon nanotubes was evaluated by means of mechanical fracture tests and microscopic observations. The three point bending fracture tests were performed on five sets of beam specimens with initial stress concentrator to quantify the crack resistance of these materials, i.e. obtaining the values of mechanical fracture parameters (e.g. fracture toughness, fracture energy, modulus of elasticity). The material of specimens was different in amount of carbon nanotubes. First mixture was reference without nano-reinforcement, other mixtures contained carbon nanotubes in amount 0.05, 0.10, 0.15 and 0.20%, respectively. Load versus displacement diagrams (P–d diagrams) were recorded during experiments. Subsequently, these outputs were evaluated using an appropriate fracture model. The effective crack extension method and work-of-fracture method were used to evaluate the P–d diagrams in this paper. The acoustic emission measurements were also performed during the fracture experiments.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

BRITTLE MATRIX COMPOSITES 11

ISBN

978-83-89687-96-8

ISSN

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e-ISSN

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Number of pages

7

Pages from-to

261-267

Publisher name

ZTUREK Research-Scientific Institute

Place of publication

Warsaw

Event location

Warsaw

Event date

Sep 28, 2015

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000383862600027