Synthesis and mechanical properties and microstructure of geopolymer cement with high silica material

Initially mine raw material unwashed kaolin Zenouz (ZK1) was calcined for 5 hours at 800oC to obtain Meta kaolin. After that by using Meta kaolin، sodium silicate activation solution and sodium hydroxide geopolymer samples were prepared with ratios of 0. 9 Na2O/SiO2 = 0. 6 and molar ratio Na2O/Al2O3 = 1. Curing time and temperature of 3، 7 and 28 days and 25، 50 and 75 °C was selected respectively. Compressive strength was taken from prepared samples that the results showed high Compressive strength of some geopolymeric samples compared with Portland cement paste samples. For further study analysis strength، FTIR and SEM samples was used. FTIR results indicate that the formation of the geopolymer structure than Meta kaolin changes that result from their condensation polymerization of the monomers. SEM results showed that geopolymeric paste is composed of two parts; gel and Quartz remaining particles. Also was seen with increasing curing time remaining particle size reduced.