Effect of Compressive Strength of Geopolymer Paste and Bending Strength of Geopolymer Mortar: Case Study to use Fly Ash and Silica Fume as an Ingredient

Abstract

   The purpose of this research was to study the effects of the ratio of coal fly ash to silica fume (FA : SiO₂), sodium hydroxide (NaOH) concentration, the ratio of sodium hydroxide to sodium silicate (NaOH : Na2OSiO₂) by weight to compressive strength of geopolymer paste and the effect of coal fly ash ratio on silica fume (FA : SiO₂) by weight on bending strength of geopolymer mortar. The study of compressive strength found that the ratio of coal fly ash to silica fume at 80 : 20 gave the highest compressive strength, which was 91.32 kg/cm², by using higher concentrations of sodium hydroxide make the development of compressive strength better. The study of the bending strength found that the fly ash to silica fume ratio of 80 : 20 having a maximum bending strength of 3.33 kg/cm². The results of this research concluded that can be made Solid nonloadbearing concrete mansonry unit according to TIS 2895-2561. Because such standards Has determined that Solid nonloadbearing concrete mansonry unit. Receive compressive strength not less than 40.61 kg/cm². Therefore, the next stage of research will be to increase the curing age or change the mix ratio.   To increase the efficiency of research better. However, the compressive strength of geopolymer paste and the bending strength of geopolymer mortar were used in this research. There will be further studies to develop into high strength concrete products.