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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Pozzolanic Effect of Fly Ash with Calcined Lime Sludge
Author(s): S. Maheswaran, A. Ramachandra Murthy, and G. N. Sakthi Priya
Publication: Materials Journal
Appears on pages(s): 925-934
Keywords: calcined lime sludge; fly ash; heat of hydration; hydrothermal reaction; microstructure; pozzolanic effect
Abstract:This study examines the pozzolanic effect of calcined lime sludge (CLS), a residual solid waste from the paper industry, and fly ash (FA), a residue generated from thermal power plants. CLS is obtained by calcination of lime sludge (LS) at the temperature 750 to 800°C (1382 to 1472°F) for 2 hours. The formation of calcium silicate hydrate (C-S-H), which is responsible for binding aggregates in concrete, is observed by hydrothermal method for three different proportions of CLS and FA in 1:5, 2:5, and 3:5 ratios at the temperature 220 to 250°C (428 to 482°F) in a hydrothermal cell. The chemical composition, physical properties, morphology, and mineralogical characteristics of the precursor materials and the formed C-S-H are analyzed by using XRF, XRD, SEM/EDS, TG-DSC, and FT-IR. In addition, the hydration behavior of ternary blended cementitious paste at a constant temperature of 30°C (86°F) is evaluated for pozzolanic activity by using ordinary portland cement (OPC), FA, and CLS in three different proportions. The result shows that the premature stiffening during early hydration of ternary blends compared to control. This study leads to potential use of FA and CLS in large quantities in a promising direction.
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