Effect of Sulfate on the Reaction of 3CaO.SiO2 Formation in Presence of Clinker Melt and Its Appearance in Clinker

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 30(1); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(1): 7.

$SO_3$가 클링커 액상이 존재하는 $3CaO.SiO_2$ 생성반응에 미치는 영향과 클링커안에서의 존재상태

정해문, 한기성¹, 최상흘

한양대학교 공과대학 무기재료공학과
¹인하대학교 공과대학 요업공학과

Effect of Sulfate on the Reaction of 3CaO.SiO2 Formation in Presence of Clinker Melt and Its Appearance in Clinker

ABSTRACT

Effect of sulfate on the reactionof C3S formation in presence of clinker melt and its appearance in clinker were investigated, using (NH4)2SO4 and CaSO4 as sulfate sources. When (NH4)2SO4 and CaSO4 were added, both showed the similar results, 1.0wt% of sulfate could promoted the reaction of C3S formation, however for its content of more than 2.0wt%, the formation of C3S was prevented. Residual limit of sulfate to C3S formation is about 1.4wt%. Appearances of sulfate were C4A3l and CaSO4 in interstitial phase. For the addition of (NH4)2SO4 or CaSO4 of 20wt%~4.0wt%, C3S grains showed the hypertrophic growth. We might consider that, because sulfate reduced the surface tension and viscosity of the clinker melt, C3S crystals were precipitated below 140$0^{circ}C$, and the crystlas of C3S were coalesced and linked in the same crystallographical direction with increasing temperature becuase of their rapid growth rate.