A novel study on dielectric aspect of mortars about multi-binder structures consisting of divergent binders

Abstract

Although there is a significant amount of CO2 emissions from cement, there are several innovative alternatives to reduce this amount. One of these is the utilize of pozzolanic materials alongside cement to diminish the mass of cement utilised. In that investigation, the mechanical, microstructural and dielectric aspects of mortar examples were investigated utilising discrete materials with pozzolanic properties as obsidian (OB), silica fume (SF), fly ash (FA) and granulated blast furnace slag (GGBS). Mortar specimens prepared with substitution proportions ranging from 0 % to 40 % were cured for 3, 7 and 28 days. The effects of the different materials on specific properties were characterised. According to the results obtained from the study, although the positive effects of pozzolanic materials were generally observed, the peak compressive strengths (CS) were acquired from the specimens including OB and SF. When the substitution rate exceeded a certain ratio, the compressive strengths decreased. It was clearly seen that there was a linear connection between the CSs and the results obtained from XRD, TGA and FTIR experiments. It was observed that the substitution of pozzolanic material made the structure of the mortars more compact and reduced the capillary voids and cracks. The scattering parameters of the original mortar specimens were evaluated at 6 GHz with a cube-shaped cavity resonator structure and converted into dielectric coefficient by the Nicolson Ross Weir Method. The dielectric coefficients of 3, 7 and 28 days old mortar examples were nonlinearly regressed with a fourth order power series and modelled having R2 values of 0.9994, 0.9995, and 0.9987, correspondingly. In this way, the proposed concrete content was measured quickly, practically and with high accuracy unlike traditional methods. The consequences of the research are assumed to encourage the utilize of pozzolanic materials in the production of mortars, specially in terms of mechanical and electrical properties.