Publication detail

Effect of graphite filler on crack initiation of alkali-activated slag based composites

ŠIMONOVÁ, H. TOPOLÁŘ, L. ROVNANÍK, P. SCHMID, P. KERŠNER, Z.

Original Title

Effect of graphite filler on crack initiation of alkali-activated slag based composites

Type

abstract

Language

English

Original Abstract

The alkali-activated slag (AAS) is an alternative building material to ordinary Portland cement (OPC) based materials. The mechanical properties and application possibilities of AAS are very similar to OPC based materials. This type of material is effective in reducing CO2 emissions and energy consumption (Keun-Hyeok et al.). Addition of graphite powder increases its electric conductivity, hence, introducing new functionality to building materials such as self-sensing and self-heating properties. In this study, the effect of graphite filler on the crack initiation of alkali-activated slag composite is investigated. The graphite powder was added in the amount of 5, 10 and 15% with respect to the slag mass. Beam specimens with an initial stress concentrator were tested in three-point bending at the age of 28 days. The load versus crack mouth opening displacement (F–CMOD) diagrams were recorded during the fracture tests and evaluated using the Double-K fracture model (Kumar and Barai). This model allows the quantification of two different levels of crack propagation: initiation, which corresponds to the beginning of stable crack growth, and the level of unstable crack propagation. The course of fracture tests was also monitored by acoustic emission (AE) method (Grosse and Ohtsu).

Keywords

fracture test, crack initiation, double-K model, alkali-activation, slag, graphite, acoustic emission

Authors

ŠIMONOVÁ, H.; TOPOLÁŘ, L.; ROVNANÍK, P.; SCHMID, P.; KERŠNER, Z.

Released

19. 6. 2017

Publisher

Brno University of Technology

Location

Brno

ISBN

978-80-214-5507-8

Book

Proceedings of the International Conference NON-TRADITIONAL CEMENT & CONCRETE VI

Pages from

52

Pages to

53

Pages count

2

BibTex

@misc{BUT137341,
  author="Hana {Šimonová} and Libor {Topolář} and Pavel {Rovnaník} and Pavel {Schmid} and Zbyněk {Keršner}",
  title="Effect of graphite filler on crack initiation of alkali-activated slag based composites",
  booktitle="Proceedings of the International Conference NON-TRADITIONAL CEMENT & CONCRETE VI",
  year="2017",
  pages="52--53",
  publisher="Brno University of Technology",
  address="Brno",
  isbn="978-80-214-5507-8",
  note="abstract"
}