%0 Generic %A LIVI, C. N. %A REPETTE, W. L. %D 2018 %T Effect of NaOH concentration and curing regime on geopolymer %U https://scielo.figshare.com/articles/dataset/Effect_of_NaOH_concentration_and_curing_regime_on_geopolymer/5862075 %R 10.6084/m9.figshare.5862075.v1 %2 https://scielo.figshare.com/ndownloader/files/10409793 %2 https://scielo.figshare.com/ndownloader/files/10409796 %2 https://scielo.figshare.com/ndownloader/files/10409805 %2 https://scielo.figshare.com/ndownloader/files/10409808 %2 https://scielo.figshare.com/ndownloader/files/10409811 %2 https://scielo.figshare.com/ndownloader/files/10409814 %2 https://scielo.figshare.com/ndownloader/files/10409817 %2 https://scielo.figshare.com/ndownloader/files/10409820 %2 https://scielo.figshare.com/ndownloader/files/10409823 %K alkali-activated binder %K strength %K x-ray diffraction %K thermal analysis %X

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%.

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