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Effect of NaOH concentration and curing regime on geopolymer
| IBRACON Structures and Materials Journal
Effect of NaOH concentration and curing regime on geopolymer
Carolina Noda Livi
PhD student at the Department of Civil Engineering, Federal University of Santa Catarina
Wellington Longuini Repette
Professor at the Department of Civil Engineering, Federal University of Santa Catarina, Brazil
Abstract
The effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions. Prismatic specimens were molded, cured at 65 °C and 85 °C and submitted to flexural and compressive strength tests. Unreacted fly ash and geopolymers were characterized by X-ray diffraction and thermogravimetric analysis. In general, the mechanical strength was enhanced by increasing the molar concentration and the curing temperature. This trend was confirmed by thermogravimetric data. However, for a lower amount of NaOH there were no significant differences between the strength results. The mixture with the highest strength was obtained with the 16 M NaOH solution and curing temperature of 85 °C, which resulted in flexural strength of 4.20 MPa, compressive strength of 21.35 MPa and also the highest weight loss of 9.89%.
Author Biographies
Carolina Noda Livi, PhD student at the Department of Civil Engineering, Federal University of Santa Catarina
Carolina Noda Livi is a PhD student in the Department of Civil Engineering, Federal University of Santa Catarina, Brazil. She received her BS in Civil Engineering from State University of West Paraná, Brazil; MS in Civil Engineering from Federal University of Santa Catarina, Brazil. Her research interests include curing regime, high – performance, sustainable and geopolymer materials.
Wellington Longuini Repette, Professor at the Department of Civil Engineering, Federal University of Santa Catarina, Brazil
Wellington Longuini Repette is a Professor at the Department of Civil Engineering, Federal University of Santa Catarina, Brazil. He received his PhD in Civil Engineering from the University of São Paulo, Brazil, and Postdoctoral Research from the National Research Council, Canada. He is leading researcher in the Center for Nanotechnology Application in Construction – NANOTEC/UFSC. His research interests include nanotechnology, durability, concrete, admixtures and geopolymer materials.
