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ŠIMONOVÁ, H. TOPOLÁŘ, L. SCHMID, P. KERŠNER, Z. ROVNANÍK, P.
Original Title
Effect of Carbon Nanotubes in Metakaolin-based Geopolymer Mortars on fracture toughness parameters and Acoustic Emission Signals
Type
conference paper
Language
English
Original Abstract
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.
Keywords
Geopolymer, carbon nanotube, fracture test, crack propagation, acoustic emission method.
Authors
ŠIMONOVÁ, H.; TOPOLÁŘ, L.; SCHMID, P.; KERŠNER, Z.; ROVNANÍK, P.
RIV year
2015
Released
28. 9. 2015
Publisher
ZTUREK Research-Scientific Institute
Location
Warsaw
ISBN
978-83-89687-96-8
Book
BRITTLE MATRIX COMPOSITES 11
Pages from
261
Pages to
267
Pages count
7
BibTex
@inproceedings{BUT117158, author="Hana {Šimonová} and Libor {Topolář} and Pavel {Schmid} and Zbyněk {Keršner} and Pavel {Rovnaník}", title="Effect of Carbon Nanotubes in Metakaolin-based Geopolymer Mortars on fracture toughness parameters and Acoustic Emission Signals", booktitle="BRITTLE MATRIX COMPOSITES 11", year="2015", pages="261--267", publisher="ZTUREK Research-Scientific Institute", address="Warsaw", isbn="978-83-89687-96-8" }