Fabrication and Characterization of Glass and Glass-Ceramic from Cement Dust and Limestone Dust

Abstract

Recycling the solid wastes like cement dust and limestone dust and using in the manufacturing of glass and glass - ceramics are strongly needed. These glasses fabricated by melt-quench technique. The X-ray diffraction (XRD) patterns of all the studied samples confirmed the amorphous nature These glasses have been investigated for their physical properties using density and molar volume, structural properties using FTIR spectroscopy, optical properties using UV-Vis spectroscopy, thermal analysis and mechanical properties. The density, molar volume and refractive index vary with the concentration of CaO. The variations of various physical, structural, thermal analyses, mechanical and optical properties with the concentration of CaO in this glass system depict a strong structural influence of CaO. The ultrasonic velocity of these glasses has been decreased with addition of CaO, this decrease is connected to the decreasing the bonding strength between Calcium - oxygen are lower than the bond between silicon - oxygen (32-106 k cals).The elastic moduli of these glasses determined experimentally and calculated theoretically, according to Makishima–Mackenzie model decreased with increasing of CaO. This behavior may be related to changing the coordination number with an increasing of CaO and the decrease in the average force constant and crosslink density. The crystalline phase of the prepared glass ceramic is diopside with the chemical formula (Ca MgO6 Si) in all selected samples.