Use of Glassy Slag from Biomass Combustion in the Building Industry – Coarse Aggregate

Abstract

The work deals with possibilities using of glassy slag produced during the combustion of biomass in construction. This is a waste product with glass characteristic, which may also contain ash and other pollutants. This waste is significantly different according to the used types of biomass, soil, temperature and time of combustion. Its structure is mostly porous and glassy. Building materials in which may be applied are cementitious or alkali-activated composites in which can appear in due to its nature as a filler or binder. In the paper the basic characteristics with the focus on use of this slag as a coarse aggregate were examined.

Waste from Biomass Combustion - Lightweight Aggregate

“…The problem of using this waste in the building industry is it chemical composition. From the results of previous works [3,4] we can assume that this waste cannot be used neither as a coarse aggregate nor as a binder due to the high amount of amorphous SiO 2 and potassium cations which in the alkaline Ca 2+ solution create new C-S-H formations in high amount. One of the possibilities of solving this problem is use of this slag in the form of sintered lightweight aggregate.…”