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Environmental Engineering Research 1999;4(4): 251-258.
DEVELOPMENT OF HIGH STRENGTH CEMENTITIOUS PRODUCTS USING INDUSTRIAL WASTE SLUDGE
Hyungjin Kim1, and Nam Woong Lim2
1Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA
2Department of Environmental Engineering, Graduate School of Construction Engineering, Chung Ang University, Seoul, Korea
Corresponding Author: Hyungjin Kim ,
Received: June 6, 1999;  Accepted: September 6, 1999.
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ABSTRACT
The inorganic sludge wasted from the chemical processes of "D" company in Incheon was examined to see if it can be reused as a raw material for development of the cementitious products, after calcination at 500~1000℃. The optimum condition of calcination was determined by the compressive strength. The cementitious products with use of the optimally calcined sludge, sand, fly ash, OPC(Ordinary Portland Cement), and WRA(Water Reducing Agent) were formulated. The products so developed were tested for the physical properties. The results revealed a general trend of increasing compressive strength with increasing calcination temperature from 500 to 1000℃. The sludge calcined at 1000℃ was most effective in developing higher compressive strength than at 500℃. The maximum compressive strength developed was 450 kg/cm2 after curing for 28 days. This was almost 100% improvement in strength, compared to 230 kg/cm2 of raw sludge under the same curing period. The X-ray diffraction(XRD) and scanning electron microscope(SEM) revealed that calcium silicate hydrate(Ca2SiO4.l-4H2O) predominately appeared in the product made by calcination at l000℃.
Keywords: sludge | calcination | cement | compressive strength | fly ash
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