This study discusses strength deterioration during the curing process of fly ash geopolymer and the use of CaSO4·2H2O (gypsum) as a deterioration remedy when the ash was synthesized using a 10M NaOH and Na-silicate solution. The strength decline was mainly due to the widespread formation of nanometer-sized cracks that were related to excessive Na and Si concentrations at an early age. Use of 2 ...

Geopolymers represent a new class of inorganic materials that have great potential for practical application due to the properties used raw materials, as well peculiarities cementitious matrix structure formed during geopolymerization process. Cellular geopolymer specimens were produced in this study using F fly ash product, which is characterized by low reactivity geopolymerization. Several st...

Abstract In this study, the effect of SiO 2 /Al O 3 (S/A), Na O/Al (N/A) and H O/Na (H/N) molar ratios on bending compressive strength geopolymer were investigated. The geopolymerization mechanism was also analyzed from microstructure difference by FTIR. experimental results showed that has an opposite reaction under different critical ratios. increase S/A ratio decrease N/A H/N have resulted i...