Effect of Alkali on the Geopolymer Strength

In this study, geopolymer was synthesized with metakaolin and tungsten-tailing as the main raw material and alkali activator composed of sodium silicate solution and alkali solution. By the contrast of the experiments with five kinds of alkali activators, the result was obtained. When the concentration of the NaOH or KOH was 10mol/L,the content of NaOH or KOH in the liquid phase was 35%,while the concentration of the Ca(OH)2was 3mol/L, the content in the liquid phase was 35%,the property of geopolymer was the best. For the combined alkali, when the content ratio of Ca(OH)2to KOH or Ca(OH)2to NaOH of 2:3,there was a balance between the activator of alkali and the resistance of Ca2+.The trigger action of the alkali activator on the activity of slag was accelerated.