Development of polystyrene-geopolymer composite for thermal insulating material and its properties with special regards to flame resistance

Mucsi, Gábor and Szabó, Roland and Nagy, Sándor and Bohács, Katalin and Gombkötő, Imre and Debreczeni, Ákos (2017) Development of polystyrene-geopolymer composite for thermal insulating material and its properties with special regards to flame resistance. IOP Conference Series: Materials Science and Engineering. ISSN 1757-8981 (In Press)

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Abstract

As a first part of the research, systematic experimental series were conducted in order to develop an appropriate fly ash-based geopolymer binder focusing on the workability of the paste. In these series, the NaOH molar ratio and water glass/NaOH ratio were investigated and the fineness of the fly ash was optimized presented in a recent paper. Based on these results the effect of metakaolin on the mechanical properties was studied. After developing the appropriate binder, experimental series were carried out using ground polystyrene as light aggregate in various concentration (from 30 V/V% up to 98 V/V%) and geopolymer as a binder in order to develop a heat insulating material. Compressive and flexural strength, specimen density, flammability, freeze-thaw resistance were determined in order to characterize the composite product. As a result of the experimental investigation, it was found that the flexural strength of the composite was found to be ~400 kPa which is as high as the original polystyrene heat insulating panel. Additionally, the flammability was much better than the original pure PS product, the sample was not ignited even at higher PS content (90%). Furthermore, the freeze-thaw resistance of the composite improved compared with the neat geopolymer.

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