Investigation on the properties of GGBS based geopolymer mortar with the inclusion of calcined clay

The performances of a geopolymeric binder produced without utilising conventional cement and employing as sources Calcined clay and Ground Granulated Blast Furnace Slag (GGBS) have been examined in this research. The Alkaline liquid-to-binder ratio is considered to be 0.4 and the ratio of Na2SiO3 to NaOH to 2.5. Standard mortar characteristics including setting time, consistency, water absorption and compressive strength were assessed in accordance with the ASTM and Indian standards. The results of the tests demonstrate that the consistency and initial setting time were improved as the increase in the amount of calcined into the paste of geopolymer. The maximum compressive strength (37.1 MPa at 56 days of curing) was obtained at 10% replacement of calcined with GGBS then strength was declined after increasing the proportion of calcined clay and the water absorption (6.5% at 56 days of testing) values were reduced at 10% replacement of GGBS with calcined clay then it was increased as increased the proportion of calcined clay. The cluster and regression analysis were also done in this study.