Chutchavan Visitanupong และ Prasert Suwanvitaya. (2009) Durability of fly ash based geopolymer mortar. Kasetsart University,:ม.ป.ท.Chutchavan Visitanupong และ Prasert Suwanvitaya. 2009. Durability of fly ash based geopolymer mortar. ม.ป.ท.:Kasetsart University,;Chutchavan Visitanupong และ Prasert Suwanvitaya. Durability of fly ash based geopolymer mortar. ม.ป.ท.:Kasetsart University, 2009. Print.