Effect of steel fibres dosage in alkali-activated slag mortar on acoustic emission obtained during three-point bending tests

Aluminosilicate materials are generally considered electrical insulators. In order to achieve enhanced electrical conductivity these materials must doped with suitable conductive admixtures such as carbon black. These composites gain the importance in the new field of applications such as self-sensing materials or self-monitoring structures. This paper presents a study on self-sensing properties of alkali-activated slag composite with 2 and 4% of carbon black as conductive filler during repeated flexural and till fracture loading in the configuration of three-point bending test. The results showed that best performance of the self-sensing properties was achieved with 4% of carbon black, though both the compressive and flexural strengths were deteriorated.

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Influence of Superplasticizer Quantity on Formation of Micro-Cracks during Setting and Hardening of Concretes by Acoustic Emission Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1124.219 ◽

2015 ◽

Vol 1124 ◽

pp. 219-224 ◽

Cited By ~ 2

Author(s):

Libor Topolář ◽

Kristýna Timcakova ◽

Petr Misák

Keyword(s):

Acoustic Emission ◽

Building Materials ◽

Material Behaviour ◽

Emission Method ◽

Alkali Activated Slag ◽

Volumetric Expansion ◽

Hardening Process ◽

Micro Cracks ◽

Activated Slag ◽

Alkali Activated

The acoustic emission phenomenon is directly associated with nucleation of cracks in building materials, therefore the changes result from the volumetric expansion causing formation micro and macro cracking in structure, which we can recognize. The main aim of the article is to compare four ways of curing alkali activated slag mortars by method of acoustic emission. A comprehension of microstructure−performance relationships is the key to true understanding of material behaviour. The results obtained in the laboratory are useful to understand the various stages of micro-cracking activity during the hardening process in quasi-brittle materials such as alkali activated slag mortars and extend them for general practice

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Experimental evaluation of the effect of carbon fibres on acoustic emission parameters obtained during compressive strength tests of alkali-activated slag composites

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/379/1/012037 ◽

2018 ◽

Vol 379 ◽

pp. 012037

Author(s):

L Topolář ◽

P Rovnaník ◽

P Schmid

Keyword(s):

Compressive Strength ◽

Acoustic Emission ◽

Experimental Evaluation ◽

Carbon Fibres ◽

Alkali Activated Slag ◽

Strength Tests ◽

Activated Slag ◽

Alkali Activated

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Electrical Properties of Steel Fibre Reinforced Alkali-Activated Slag Composite

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.760.55 ◽

2018 ◽

Vol 760 ◽

pp. 55-60 ◽

Cited By ~ 1

Author(s):

Pavel Rovnaník ◽

Ivo Kusák

Keyword(s):

Electrical Properties ◽

Electrical Resistance ◽

Steel Fibre ◽

Steel Fibres ◽

Alkali Activated Slag ◽

Mechanical And Electrical Properties ◽

Sensing Material ◽

Good Conductor ◽

Activated Slag ◽

Alkali Activated

Alkali-activated slag is an alternative binder to the ordinary Portland cement. In order to improve its tensile properties steel fibres as dispersed reinforcement can be used. Since steel is very good conductor it changes the electrical properties of alkali-activated slag composite that can have a potential to be used as self-sensing material then. In this study up to 20% of steel fibres by mass of the slag was added to alkali-activated slag mortar and the mechanical properties, electrical resistance, capacitance and microstructure of the composites were investigated. The results showed that the best improvement of both the mechanical and electrical properties can be observed for the composite with 15% of steel fibres.

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