Effects of Initial Heating and Curing Conditions on Compressive Strength of Hardened Geopolymer Paste

Abstract

The effects of execution or non-execution of initial heating and curing conditions after hardening on the long-term compressive strength of JIS type-II fly ash-based geopolymer paste were experimentally examined. In the case without initial heating, the strength increase due to the material age was not recognizable even under a low humid curing condition. In this case, although there was a disadvantage in that the strength increase was delayed, the curing conditions of a constant temperature and aeration were effective. Next, in the case with initial heating, the curing condition of constant temperature and underwater were effective at the stage of 7 days of material age. On the other hand, in this case, the compressive strengths of long-term material age were decreased in the curing condition of aeration. As a reason for this result, in the curing condition of aeration, the effects of impacts such as the variations of temperature and humidity were assumed to be in comparison with the curing conditions of being underwater and underground.