Abstract
This paper presents novel research on a fluidized bed combustion (FBC) fly ash-based geopolymer as a contribution to the problem of FBC fly ash disposal, and a proposal for a new geopolymer composition—an environmentally friendly material that is possible to use in construction. Geopolymer samples of various composition (containing FBC fly ash as the main raw material, metakaolin and CRT glass as additional components, and sodium silicate and sodium hydroxide as activators) were subjected to flexural and compressive strength tests. An investigation on the effect of the demolding time was carried out on one selected mixture. The test showed that both the composition and the demolding time have a decisive influence on the basic mechanical properties. A mixture containing FBC fly ash to metakaolin in a mass ratio of 3:1, removed from the mold after 14 days, was found to be the best in terms of the mechanical parameters expected from a material that could be used in construction, e.g., for the production of precast elements. According to the results obtained, FBC fly ash is a promising and environmentally friendly raw material for the production of geopolymer, with good mechanical properties and low density. Moreover, a high compressive strength can be obtained by curing the geopolymer at ambient temperature.
Highlights
Fluidized bed combustion (FBC) technology was introduced to the market in the 1970s as a cleaner method of energy production
This paper presents the study on the determination of the optimal mixture and hardening regime of geopolymer based on fluidized bed combustion (FBC) fly ash from one of the Polish power plants
Samples made of mixture FBC fly ash (FBC FA) + M (25%) had a considerably higher flexural strength than samples made of the remaining mixtures
Summary
Fluidized bed combustion (FBC) technology was introduced to the market in the 1970s as a cleaner method of energy production. Together with usually high CaO and SO3 content and low pozzolanic activity, as well as increased water demand, limits the possibility of the application of FBC ash in some branches such as the concrete industry [3,4,5] or civil engineering. Such wastes can find application in road bases, stabilization of soils, production of synthetic aggregates, structural fill, mine backfilling, as a filler in polymer composites etc. The new possibilities of utilization of such type of wastes are still demanded
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