Comparative Study of Compressive Strength of JIS Fly Ash-Based Hardened Geopolymer Paste for Different Discharge Lots

Abstract

The comparisons of the compressive strength of hardened geopolymer pastes using 4 types of fly ash which were different in discharge lot were examined. As for the principal chemical components of these fly ashes, the differences in the amounts of Fe₂O₃, CaO, TiO₂ and MgO were approved. Although the differences of ignition loss, particle size distribution and pH were also recognized, the difference of Blaine value was not assessed. Then the polymerization by dehydration of geopolymer using fly ash without self-hardening property might be exerted as the strength increase after 28 days of material age. As the result of a multiple regression analysis, the material age was consequently determined as the most influential factor for the compressive strength of geopolymer, whereas the basicity of fly ash was also found as a considerable influential factor.