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.

scholarly journals Electrical and Self-Sensing Properties of Alkali-Activated Slag Composite with Graphite Filler

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1616 ◽  
Author(s):  
Pavel Rovnaník ◽  
Ivo Kusák ◽  
Patrik Bayer ◽  
Pavel Schmid ◽  
Lukáš Fiala
Keyword(s):  
Mechanical Properties ◽  
Electrical Properties ◽  
Compressive Loading ◽  
Conductive Filler ◽  
Graphite Powder ◽  
Alkali Activated Slag ◽  
Sensing Properties ◽  
Activated Slag ◽  
Conductive Properties ◽  
Alkali Activated

The electrical properties of concrete are gaining their importance for the application in building construction. In this study, graphite powder was added to alkali-activated slag mortar as an electrically conductive filler in order to enhance the mortar’s conductive properties. The amount of graphite ranged from 1% to 30% of the slag mass. The effect of the graphite powder on the resistivity, capacitance, mechanical properties, and microstructure of the composite was investigated. Selected mixtures were then used for the testing of self-sensing properties under compressive loading. The results show that the addition of an amount of graphite equal to up to 10% of the slag mass improved the electrical properties of the alkali-activated slag. Higher amounts of filler did not provide any further improvement in electrical properties at lower AC frequencies but caused a strong deterioration in mechanical properties. The best self-sensing properties were achieved for the mixture with 10 wt% of graphite, but only at low compressive stresses of up to 6 MPa.

scholarly journals Strength Characteristics of Alkali-Activated Slag Mortars with the Addition of PET Flakes

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6274
Author(s):  
Agnieszka Kocot ◽  
Andrzej Ćwirzeń ◽  
Tomasz Ponikiewski ◽  
Jacek Katzer
Keyword(s):  
Mechanical Properties ◽  
Co2 Emissions ◽  
Mechanical Test ◽  
Research Programme ◽  
Curing Temperature ◽  
Alkali Activated Slag ◽  
Electron Microscope Analysis ◽  
Compressive And Flexural Strengths ◽  
Activated Slag ◽  
Alkali Activated

The production of ordinary Portland cement is associated with significant CO2 emissions. To limit these emissions, new binders are needed that can be efficiently substituted for cement. Alkali-activated slag composites are one such possible binder solution. The research programme presented herein focused on the creation of alkali-activated slag composites with the addition of PET flakes as a partial substitute (5%) for natural aggregate. Such composites have a significantly lower impact in terms of CO2 emissions in comparison to ordinary concrete. The created composites were differentiated by the amount of activator (10 and 20 wt.%) and curing temperature (from 20 to 80 °C). Their mechanical properties were tested, and a scanning electron microscope analysis was conducted. Compressive and flexural strengths ranging from 29.3 to 68.4 MPa and from 3.5 to 6.1 MPa, respectively, were achieved. The mechanical test results confirmed that a higher amount of activator improved the mechanical properties. However, the influence of the PET particles on the mechanical properties and microstructure varied with the curing temperature and amount of activator. Areas that require further research were identified.

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