Geopolymer Based on Mechanically Activated Air-cooled Blast Furnace Slag

Materials
Ilda ToleAndrzej Cwirzen

Abstract

An efficient solution to increase the sustainability of building materials is to replace Portland cement with alkali-activated materials (AAM). Precursors for those systems are often based on water-cooled ground granulated blast furnace slags (GGBFS). Quenching of blast furnace slag can be done also by air but in that case, the final product is crystalline and with a very low reactivity. The present study aimed to evaluate the cementitious properties of a mechanically activated (MCA) air-cooled blast furnace slag (ACBFS) used as a precursor in sodium silicate alkali-activated systems. The unreactive ACBFS was processed in a planetary ball mill and its cementing performances were compared with an alkali-activated water-cooled GGBFS. Mixes based on mechanically activated ACBFS reached the 7-days compressive strength of 35 MPa and the 28-days compressive strength 45 MPa. The GGBFS-based samples showed generally higher compressive strength values.

References

Jun 28, 2001·Journal of Colloid and Interface Science·Ray L. FrostJ. Theo Kloprogge
Sep 10, 2003·Journal of Colloid and Interface Science·Ray L FrostTamás Cseh
Jun 30, 2012·Nature Methods·Johannes SchindelinAlbert Cardona
Aug 30, 2012·Nature Methods·Caroline A SchneiderKevin W Eliceiri
Apr 6, 2013·Chemical Society Reviews·Peter BalážKrystyna Wieczorek-Ciurowa
Jul 15, 2015·Molecular Reproduction and Development·Johannes SchindelinKevin W Eliceiri

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