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ROVNANÍK, P. BAYER, P. TOPOLÁŘ, L. ŠIMONOVÁ, H. SCHMID, P.
Original Title
EFFECT OF CARBON NANOTUBES ON THE MECHANICAL FRACTURE PARAMETERS AND MICROSTRUCTURE OF ALKALI ACTIVATED SLAG MORTARS
English Title
Type
conference paper
Language
en
Original Abstract
Alkali activated slag has a great potential to be used in practice. The mechanical properties and application possibilities of alkali activated slag composites are very similar to ordinary cement based concrete. However, the major disadvantage of alkali activated slag is an increased shrinkage, which results in microcracking and deterioration of tensile and bending properties. The study investigates the possibility of using carbon nanotubes (CNTs) as nanosized reinforcement to reduce the cracking tendency of alkali activated slag composite. The effect of CNTs was evaluated by means of mechanical fracture tests and microscopic observations. Compressive strength has increased with 0.5% addition of CNTs but higher content of CNTs causes a deterioration of the compressive strength. Modulus of elasticity was also slightly higher in case of the mixture with 0.5% of CNTs. Effective fracture toughness and fracture energy values are in both cases lower than with reference mixture. Therefore, it can be assumed that such amounts of CNTs do not improve fracture parameters of AAS material. The micrographs revealed that CNTs were not able to eliminate the stress caused by a drying shrinkage of AAS matrix and still some cracks can be observed in the matrix.
English abstract
Keywords
Slag, Alkaline activation, Carbon nanotubes, Microstructure, Fracture parameters
RIV year
2014
Released
17.06.2014
Publisher
Vysoké učení technické v Brně
Location
Brno
ISBN
978-80-214-4867-4
Book
Non-Traditional Cement & Concrete V
Issue number
1
Pages from
179
Pages to
182
Pages count
4
Documents
BibTex
@inproceedings{BUT108079, author="Pavel {Rovnaník} and Patrik {Bayer} and Libor {Topolář} and Hana {Šimonová} and Pavel {Schmid}", title="EFFECT OF CARBON NANOTUBES ON THE MECHANICAL FRACTURE PARAMETERS AND MICROSTRUCTURE OF ALKALI ACTIVATED SLAG MORTARS", annote="Alkali activated slag has a great potential to be used in practice. The mechanical properties and application possibilities of alkali activated slag composites are very similar to ordinary cement based concrete. However, the major disadvantage of alkali activated slag is an increased shrinkage, which results in microcracking and deterioration of tensile and bending properties. The study investigates the possibility of using carbon nanotubes (CNTs) as nanosized reinforcement to reduce the cracking tendency of alkali activated slag composite. The effect of CNTs was evaluated by means of mechanical fracture tests and microscopic observations. Compressive strength has increased with 0.5% addition of CNTs but higher content of CNTs causes a deterioration of the compressive strength. Modulus of elasticity was also slightly higher in case of the mixture with 0.5% of CNTs. Effective fracture toughness and fracture energy values are in both cases lower than with reference mixture. Therefore, it can be assumed that such amounts of CNTs do not improve fracture parameters of AAS material. The micrographs revealed that CNTs were not able to eliminate the stress caused by a drying shrinkage of AAS matrix and still some cracks can be observed in the matrix.", address="Vysoké učení technické v Brně", booktitle="Non-Traditional Cement & Concrete V", chapter="108079", howpublished="print", institution="Vysoké učení technické v Brně", year="2014", month="june", pages="179--182", publisher="Vysoké učení technické v Brně", type="conference paper" }