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반응표면분석법에 따른 저온소성 경량골재의 킬른공정변수 최적화
이한백,서치호,Lee, Han-Baek,Seo, Chee-Ho 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.5
This paper was to evaluate the influence of kiln process parameter(kiln angle, kiln rotating speed) of lightweight aggregate using waste glass and bottom ash with industrial by-products on thermal conductivity, density, water absorption, fracture load and porosity by response surface analysis. In the results of surface plot and contour plot, it has verified that kiln residence time of lightweight aggregate increase as kiln angle and rotating speed decreases. For this reason, pore size and quantity tend to increase by active reaction of forming agent. It seems to be that increase in pore size and quantity have caused decreasing density, fracture load and thermal conductivity, and increasing water absorption. In conclusion, optimization of kiln process parameter on thermal conductivity, density, water absorption, fracture load and porosity by response surface analysis are kiln angle 2.4646%, kiln rotating speed 40.7089 rpm.
폐유리분말 코팅에 따른 저흡수 경량골재의 흡수특성 및 미세구조
이한백(Lee Han-Baek),서치호(Seo Chee-Ho),김상헌(Kim Sang-Heon) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.9
As quantity of waste glass powder on the surface of lightweight aggregates increased, absolute dry density increased and water absorption reduced. This reasons are because the amount of coating increases, open pores on the surface of lightweight aggregates become more likely to be closed pores as well as increase to waste glass coating layer relatively reduced pore volume within lightweight aggregates. As sintering temperature of lightweight aggregates increased, absolute dry density reduced and water absorption increased. This reason such as above is because increase of sintering temperature invigorated CaCO₃ foaming agent included inner layer. In case of sintering less than 800℃ most lightweight aggregates, water absorption had been shown below 4% at 30wt% of waste glass powder and below 3% at 50wt% of waste glass powder. Thus coating of waste glass powder on the surface of lightweight aggregates proved effective in controlling water absorption. In conclusion, we manufactured lightweight aggregate for energy saving, main ingredient is used waste glass of a low softening point(about 700℃) and bottom ash containing unburned fixed carbon and volatile matter about 20~25%, which was possible to sinter by decreasing the sintering temperature about 20~30% than existing products. Manufacturing technology of lightweight aggregate has been secured similar water absorption level of natural aggregate, less than 3%, as sintering after coating the external surface with waste glass powder.