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Subject: search.filters.subject.Aluminium refinery residue (ARR)

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    Effect of Ggbs on Strength of Aluminium Refinery Residue Stabilized by Alkali Solution
    (Springer Science and Business Media Deutschland GmbH, 2021) Kudachimath, N.; Mulangi, R.H.; Das, B.B.
    In the present study aluminium refinery residue (ARR), that is, solid waste generated in the production of alumina also known as red mud, was stabilized with ground granular blast furnace slag (GGBS), silica modulus and Na2O content. The prime chemical composition of aluminium refinery residue is Fe2O3, Al2O3, SiO2 and Na2O. ARR is a highly alkaline waste. This study describes laboratory study, and the characterization of ARR can be utilized in the materials which are used for road construction. The unconfined compression strength tests were conducted on various proportions of mixes of ARR and GGBS 80% + 20%, 75% + 25% and 70% + 30% and silica modulus (0.5, 1 and 1.5) for different Na2O content. The UCS specimens were cured for 0, 7 and 28 days to observe the effect of longstanding curing. Based on the laboratory investigations, it was found that 75% ARR + 25% GGBS with 4% Na2O content increases MDD and decreases OMC content. The most appropriate mix 75% AAR + 25% GGBS with 1 silica modulus was observed with a 308.6% increase in UCS value for 28 days of curing. Higher strength is achieved if longer curing periods allowed. © 2021, Springer Nature Singapore Pte Ltd.
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    Utilization of Aluminium Refinery Residue (ARR), GGBS and Alkali Solution Mixes in Road Construction
    (Springer Science and Business Media Deutschland GmbH, 2023) Kudachimath, N.S.; Mulangi, R.H.; Das, B.B.
    Manufacturing and the construction industries are on the boom with the growing economy of the world. Aluminium and steel are produced in very large quantities compared to other metals. These industries also produce by-products that are either partially utilized or unutilized. Aluminium refinery residue (ARR) with its colour known as Redmud, produced from bauxite by Bayer process, because of its high pH demands huge storage land. In road construction, a large quantity of material is required at the lower layers. In the present work wastes from both industries are tried for reuse. Ground-granulated blast furnace slog (GGBS) from the iron and steel industry makes complex compounds with sodium silicate and sodium hydroxide to increase the strength properties of aluminium refinery residue (ARR) and is verified with basic laboratory experiments for strength and durability tests on stabilized aluminium refinery residue (ARR). Ground-granulated blast furnace slog (GGBS) of 20–30% is used to stabilize ARR, and cured for up to 28 days, and the result of the various mix has shown an increase in strength with curing periods. The highest UCS test result of 4.01 MPa was observed for 28 days cured sample. For durability tests, the treated specimens are passed through wet/dry cycle and freeze/thaw conditions for various curing periods. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.