Characterization and compressive strength of fly ash based-geopolymer pasteAri Widayanti, Ria Asih Aryani Soemitro, Hitapriya Suprayitno and Januarti Jaya EkaputriMATEC Web Conf., 195 (2018) 01023DOI: https://doi.org/10.1051/matecconf/201819501023