Development of facade panels with optimised thermal performance from alkali-activated stone-cutting waste
2022
Bruschi, Giovani Jordi | Secco, Marina Paula | Sousa, Luís | Briga-Sá, Ana | Cristelo, Nuno
The consequences of climate change have led to electricity shortages and a rising energy crisis. The demand for alternatives to reduce energy consumption is growing rapidly. Insulation improvement using porous facade panels can reduce heat exchange, contributing to a reduction in energy expenditure. However, these conventional construction materials involve energy-intensive processes and use non-renewable resources. Alkali-activation of industrial wastes may present a viable and sustainable solution. This research evaluated the applicability of alkali-activated pastes, based on stone-cutting waste, on the core of facade panels to optimise thermal insulation. An experimental program was carried out to quantify the mechanical and thermal behaviour of alkali-activated marble and granite cutting waste. The results indicate that both wastes are viable precursors to produce facade panels in terms of strength. Regarding the thermal behaviour, as the density increased, the thermal transmission coefficient decreased. A range between 1.63 W/m² °C and 1.97 W/m² °C was obtained, which is lower than the thermal conductivity values shown by current insulation materials with similar density, indicating the suitability of the proposed solution for thermal insulation.
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