Abstract
In this study, the applicability of eco-friendly floor finishing mortar for heating was investigated when high amount of byproducts was used as a binder without cement. Fly ash, was produced in combined heat power plant and had much amount of free CaO, was mainly used by 35~65%, and ground granulated blast-furnace slag and paper sludge ash were added. As a result of the study, the fludity of mortar decreased when water-mortar ratio was low and addition of paper sludge ash was high. The setting time of mortar was delayed when water-mortar ratio was high and, especially, it's final setting time was delayed three times more than that of plain mortar. Length of mortar specimen was expanded up to $180{\sim}290{\mu}$ at age of 1 day and it was shown that this mortar had an advantage of the reduction of crack. Also, hydration properties of this mortar was similar to that of ordinary portland cement hydration products such as monosulphate, $Ca(OH)_2$, and ettringite etc. were formed at early ages and much CSH(I,II.III) was formed at age of 28 days.
