Abstract
This paper presents mechanical and physical properties of light porous aggregates obtained from local waste materials. Granules were produced from a mixture of aluminosilicate-based coal-mine slates and car windshield glass that was contaminated by the polyvinyl butyral foil. The initial waste material ratio modification significantly alters physical and mechanical properties of obtained ceramic granules to the extent of the critical amount of added windshield glass powder. The temperature of the heat treatment affects the granules’ properties and demonstrates the microstructure and phase crystallization control possibilities. The critical value of the windshield glass concentration was determined to be at a level of 30%, considering the relationship between mechanical and physical properties when large porosity is essential in further application. On the other hand, if the glass-to-slates weight ratio was equal and a sufficient thermal treatment was applied, a core–shell macrostructure formation and occlusion of pores occurred.
Highlights
Glass recycling has been a common practice for many years because glass waste is useful in the glass packaging industry; this waste significantly reduces working temperatures, improving the economy of the process
Thermal behavior of the windshield glass and mine slate mixture was examined in two ways: measurement of weight loss following isothermal thermal treatment at 850 °C in a 1-h-period, and the utilization of a dynamic DTA/DSC method
The observed mass losses of the windshield glass resulted from burning out the leftover polyvinyl butyral (PVB)
Summary
Glass recycling has been a common practice for many years because glass waste is useful in the glass packaging industry; this waste significantly reduces working temperatures, improving the economy of the process. An improvement in mechanical properties of the car windshield material results from the specific laminate. The main aim of the presented research is to propose a new way for recycling windshield glass waste where significant improvement of mechanical and physical properties are obtainable based on the usage of additional waste material in the new product manufacturing. One possible solution [4,5,6,7,8] includes manufacturing alumina silicate-based lightweight aggregates (LWA) that can be used in both building and gardening industries. Fabricated aggregates could be applied to concrete block production; a number of requirements, specified in EN 1097, UNE-EN 13055 and many other standards must be fulfilled for this purpose [14, 15]
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