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PROPERTIES OF WHEAT STRAW ASH GEOPOLYMER FOR CONSTRUCTION USE
Abstract
Today the use of biomass combustion for the generation electric power is enormously growing. It is due to the worldwide interest in the environmental sustainability and production of renewable energy. With increasing amount of biomass combusted for energy supply, huge quantity of biomass ash is generated worldwide. One of the open questions related to extensive biomass combustion is what we are going to do with this huge amount of biomass ash. Considering both the environmental and economic issues, biomass ash must be safely treated, and preferably reused as a secondary raw material in production process. As construction industry suffers from the lack of natural resources for production of building materials, the use of biomass ash in their composition could be effective solution of its disposal. At the presented study we focused at the valorisation of wheat straw ash as filler in new type of eco-efficient alkali-activated geopolymer. In intensive experimental campaign, two types of geopolymers were studied. One of the geopolymers was composed of coal fly ash, alkali activator, and silica sand. This material was used as a reference one. In composition of the second one, fly ash was partially substituted with wheat straw ash. The wheat straw ash and coal fly ash were physical and chemically analysed using particle size analyser, helium pycnometry, XRF, SEM and EDS. For the hardened geopolymers, set of structural, mechanical, hygric, and thermal properties was determined. The geopolymer produced with wheat straw ash admixture exhibited increased mechanical strength, lower porosity and thus reduced water transport parameters compared to reference material. Based on the obtained data it was concluded, the newly developed geopolymer represents eco-efficient low cost alternative to cement-based products.
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