[논문]Characterization of Slag Cement Mortar Containing Nonthermally Treated Dried Red Mud

Choe, Gyeongcheol; Kang, Sukpyo; Kang, Hyeju

doi:10.3390/app9122510

Characterization of Slag Cement Mortar Containing Nonthermally Treated Dried Red Mud 원문보기

Applied sciences, v.9 no.12, 2019년, pp.2510 -

Choe, Gyeongcheol , Kang, Sukpyo , Kang, Hyeju

Abstract ▼ AI-Helper

In this study, a method was suggested to produce dried powder from red mud (RM) sludge with 40%-60% water content without heating. The RM sludge is discharged from the Bayer process, which is used to produce alumina from bauxite ores. Nonthermally treated RM (NTRM) powder was produced by mixing RM sludge (50%), paper sludge ash (PSA, 35%), and high-calcium fly ash (HCFA, 15%). The physicochemical properties of NTRM were investigated by analyzing its water content, X-ray fluorescence spectra, X-ray diffraction patterns, and particle size. Moreover, to examine the applicability of NTRM as a construction material, slag cement mortar in which 20 wt% of the binder was replaced with NTRM was produced, and the compressive strength, porosity, and water absorption rate of the mortar were evaluated. Results indicated that NTRM of acceptable quality was produced when the water content in RM sludge decreased and CaO contained in PSA and HCFA reacted with moisture and formed portlandite. The NTRM-mixed mortar requires further examination in terms of durability because of the increased capillary voids and high water absorption rate, but its compressive strength is sufficient to enable its use in sidewalks, bike roads, and parking lots.

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Characterization of Slag Cement Mortar Containing Nonthermally Treated Dried Red Mud 원문보기

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Characterization of Slag Cement Mortar Containing Nonthermally Treated Dried Red Mud 원문보기

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