Investigation of usability of quarry dust waste in fly ash-based geopolymer adhesive mortar production: Fid-Bau Portal

Investigation of usability of quarry dust waste in fly ash-based geopolymer adhesive mortar production

Kürklü, Gökhan / Görhan, Gökhan

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Highlights • Summary of the wide literature on quarry dust waste was made. • Geopolymer based adhesive mortar containing fly ash and quarry dust was made. • Quarry dust and fly ash worked compatible in the production of the adhesive mortar. • NaOH molarity and curing time affected the geopolymer adhesive mortar properties. • Adhesive mortar could be produced using by 100% waste.

Abstract Crushed-stone dust is a harmful waste product of crushed-stone aggregate concrete production. It has no added value and is disposed of by washing in well-organized facilities. This study experimentally investigated the geopolymer-based adhesive mortar in order to use crushed-stone dust as a building material at the best rates. Fly ash (FA) was used as the geopolymer binder and sodium silicate (SS) and NaOH were used as alkali activators. NaOH was used in three different molarities (3M, 6M and 12M). Two different materials were used as adhesive mortar mineral filler: 100% quarry dust and quarry dust mixed with silica sand at a ratio of 1/3. Geopolymer adhesive mortars were cured in an oven at 80 °C for 1, 3 and 5 h. Bulk density, apparent density, water absorption, apparent porosity, capillary water absorption, compressive strength, flexural strength, tensile adhesion and rheology experiments were performed on adhesive mortar specimens. All series had higher tensile adhesive strength than the standard. 100% of the waste material was used with the binder and mineral filler, and 33% silica sand addition made a positive contribution to some mortar properties.