This paper investigates the basic properties of non-sintered cement (NSC) mortar produced using granulated blast-furnace slag (an industrial byproduct), phosphogypsum (PG) generated in fertilizer production, and slacked lime (SL) as a replacement for cement to reduce environmental load and carbon emissions. The experimental results indicate that NSC mortar using industrial byproducts and waste was initially weaker than mortar using ordinary Portland cement (OPC) but that there was a reversal in their long-term strength and durability. These results indicate that the use of NSC mortar can overcome various limitations of OPC structures and that further NSC research can facilitate the development and use of various alternatives to cement, which is one of the major causes of global warming.

The aim of this study is to look into the metakaolin replacement ratio of blast furnace slag based alkali activated slag mortar and its mechanical characteristics according to changes in stimulant concentration. Metakaolin has high fineness, and therefore the fluidity becomes lower as the replacement ratio becomes higher. So in this study, a sufficient value of mixing water was provided to secure fluidity for the characteristic experiment, and a different W/B was derived for each specimen in order to make the fluidity identical. A characteristic experiment was conducted according to the mol concentration of NaOH, which was used as the mixing water that affects fluidity. Additionally, compressive strength measurement, observation of inner microstructure through SEM, acid resistance experiment, and neutralization resistance was conducted. The results of this study revealed that for a high concentration NaOH solution to have even fluidity, a high W/B is necessary, and the functions were enhanced, not degraded.