Abstract
Studies that are analysing new, environmentally friendly building materials are getting more attention in scientific community. This research is focused on hybrid geopolymer concrete (geopolymer with ordinary Portland-cement (OPC) additive) with aim to study strength development. In this article hybrid geopolymer concrete, manufactured using biomass bottom ash, fly ash and production waste of aluminium fluoride manufacturing (silica gel) with 4 different amounts of OPC (0%, 5%, 10% and 15%) is studied. Each blend is kept in 50 0C temperature and tested after 7, 14 and 28 days. The purpose of research was to study strength development in hybrid geopolymer concrete made from materials that are mentioned aboveDOI: http://dx.doi.org/10.5755/j01.sace.19.2.17836
Highlights
IntroductionMore attention has been given to research in geopolymer concrete containing OPC as an additive
Pangdaeng et al (2014) stated that the use of OPC as additive had improved the properties of high calcium fly ash geopolymer
According to the results obtained, it can be concluded that OPC can be effectively used in geopolymer concrete as additive to increase the mechanical properties of concrete, whilst noting specific issues
Summary
More attention has been given to research in geopolymer concrete containing OPC as an additive. These cements form when blends containing low proportions of cement and high proportions (60-70 %) of mineral additions (slag, fly ash or metakaolin) are alkali activated. According to Posi et al (2016) the incorporation of OPC enhances the strength development of lightweight geopolymer concrete with a slight increase in the density. In the research the reaction mechanism involves a number of stages in which the original gels form in the OPC hydration, C-S-H gel and the gel precipitated in the alkali activation of aluminosilicates, N-A-S-H gel, evolve to C-A-S-H and (N,C)-A-S-H respectively (Inés García-Lodeiro et al 2012). Pangdaeng et al (2014) stated that the use of OPC as additive had improved the properties of high calcium fly ash geopolymer.
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