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유리섬유 폐재가 첨가된 플라이 애쉬계 인공경량골재의 소성특성
김도수,박종현,박병배,노재성 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1
The lightweight aggregate was artificially pelletized, with use of fly ash, obtained from coal power plant, and waste glass wool as a flux, by sintering process in electrical muffle furnace. Those were fired at 1,000℃ and 1,100℃ for 3 and 6 minutes respectively. IDT(Initial Deformation Temperature) of fly ash, was appeared 1,360℃, but fly ash, when mixed with 50wt% of waste glass wool and 5wt% borax as fluxes, came into 1,156℃. Absorption ratios of sintered pellets for 24hrs had the lower values in the range of 4.3 to 6.3% than 16.8% of ILA(imported lightweight aggregate). Increasing of sintering temperature and time, absolute dry specific gravity of sintered pellet tended upward. Absolute dry specific gravity of pellet sintered at 1,000℃ for 3 minutes was 1.36 and this value was similar to that of ILA. SEM showed that the fractured surface of pellet, sintered at 1,000℃, had more fused phases in outer region rather than inner. It was shown, however, that the pellet, sintered at total pore surface was increased because large pores transfer into small pores by increasing sintering temperature.
김도수,이철경,박종현,Kim, Do-Su,Lee, Churl-Kyoung,Park, Jong-Hyeon 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.3
본 연구에서는 석탄회로 제조된 인공경량골재에 석회석을 첨가하였을 때 소성온도 및 시간에 따른 소성특성을 관찰하였다. 소성온도의 증가에 따라 quartz($SiO_2$)가 감소한 반면 mullite($3Al_2O_3{\cdot}2SiO_2$)가 증가되었으며, 석회석의 첨가에 의해 clinoptiolite와 pagioclase와 같은 소성에 의한 소성광물이 생성되었다. 석탄회 및 석회석으로 제조된 경량골재의 소성성은 주로 소성시간보다는 소성온도에 의해서 좌우되는 것으로 확인되었다. 또한 소성온도 및 시간의 증가는 골재내 형성된 거대기공의 미세화 및 폐기공의 형성으로 전체 기공부피를 축소시키는 경향을 나타냈다. 1000$^{\circ}$C에서 5분가 소성시킨 경량골재의 표면은 용융 슬래그 층의 융착현상에 의해 개기공이 거의 없었으나 내부는 발포가스에 의해 수 ${\mu}$의 미세기공이 폐기공 형태로 균일하게 분포하였다. 이로부터 석회석이 첨가된 소성 경량골재의 적정 소성조건은 소성온도는 약 1000$^{\circ}$C, 소성시간은 5분이 바람직한 것으로 나타났다. In this study, sintering properties of Artificial Lightweight aggregates(ALAs) prepared from coal ash as a function of sintering temperature (900$^{\circ}$C, 1000$^{\circ}$C, 1100$^{\circ}$C) and time (2min, 5min, 10min) when limestone added as lightweight mineral was investigated. Increasing the sintering temperature resulted simultaneously from a decline of quartz mineral as well as growth of mullite mineral. Addition of limestone to ALAs newly formed sintered minerals such as clinoptilolite and plagioclase. Sintering effect of ALAs prepared from coal ash and limestone was more affected by a sintering temperature than time. As sintering temperature and time increae, transition of macropore to micropore and formation of closed pores were happened, consequently shrank the total pore volume of ALAs. The surface of ALAs sintered at 1000$^{\circ}$C for 5min was nearly not detected open pores due toe amalgamation effect of molten slag layer but homogeneous distributions of closed pores with micro-scale were examined in cross sectional area ALAs. Sintering temperature and time which present the most adequate state, in the preparation of ALAs, are corresponded to 1000$^{\circ}$C and 5min, respectively.
고유동화제와 시멘트 혼화용 무기미분체가 첨가된 시멘트 페이스트의 유동성 변화
김도수,정흥호,박병배,노재성 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.8
Effects of the dosage change, from 0 to 2.0 wt% based on cement weight, of naphthalenic (NSF) and polycarboxylic(NT-2) superplasticizers, on the fluidity of cement paste substituted by 10 wt% II-anhydrite and fly ash respectively as well as II-anhydrite and fly ash itself were investigated. Dispersion properties between particles in suspension were investigated by zeta potential test. Initial fluidity and slump loss in the paste system were observed through mini-slump and apparent viscosity changes with elapsed time. Zeta potential on the particle surface was a tendency to increase according to increasing of NSF dosage. Especially, zeta potential of fly ash has the highest value among all particles equivalent to NSF dosage. In the fluidity of cement paste substituted by inorganic particles, the specimen with substitution of 10 wt% II-anhydrite and fly ash for cement was more effective than cement itself to improve initial fluidity and retain stable fluidity of cement paste. In addition, effect of NT-2 and NSF to improve the fluidity of cement paste, addition of 1.0 wt% NT-2 was more effective than 1.5wt% NSF.