Comparison of the effect of different additives on acoustic emission parameters obtained during three-point bending tests of alkali-activated slag composites

2019 ◽  
Vol 105 ◽  
pp. 496-502
Author(s):  
Libor Topolář ◽  
Pavel Rovnaník ◽  
Cecílie Mizerová ◽  
Pavel Schmid
Keyword(s):  
Acoustic Emission ◽  
Bending Tests ◽  
Alkali Activated Slag ◽  
Three Point Bending ◽  
Activated Slag ◽  
Alkali Activated

Self-Sensing Properties of Alkali-Activated Slag Composite with Carbon Black during Bending Test

2019 ◽  
Vol 296 ◽  
pp. 167-172 ◽  
Author(s):  
Pavel Rovnaník ◽  
Cecílie Mizerová ◽  
Ivo Kusák ◽  
Pavel Schmid
Keyword(s):  
Carbon Black ◽  
Conductive Filler ◽  
Bending Test ◽  
Self Monitoring ◽  
Alkali Activated Slag ◽  
Sensing Properties ◽  
Three Point Bending ◽  
Compressive And Flexural Strengths ◽  
Activated Slag ◽  
Alkali Activated

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.

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

2015 ◽  
Vol 1124 ◽  
pp. 219-224 ◽  
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

Sign in / Sign up

Export Citation Format

Share Document