Beneficial use of boiler ash in alkali-activated bricks
Name
Muz Brick Paper RCR revision clean.pdf
Size
1.31 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Poinot, Thomas
Laracy, Michael Edward
Aponte, Cecilio
Jennings, Hamlin Manson
Ochsendorf, John A
Olivetti, Elsa A.
Date Issued
September 2017
Journal
Resources, Conservation and Recycling
Citation
Poinot, Thomas et al. “Beneficial Use of Boiler Ash in Alkali-Activated Bricks.” Resources, Conservation and Recycling 128 (January 2018): 1–10 © 2017 Elsevier B.V.
Version
Author's final manuscript
Abstract
This research incorporates waste boiler ash into masonry construction materials using alkali-activation. The boiler ash, derived from three different Indian pulp and paper mills, has many undesirable characteristics for alkali-activation, including varying shape, large particle sizes ranging from 5 to 600 μm, loss on ignition between 8 and 35%, and less than 4% alumina. When combined with supplementary materials in the form of clay and lime, high compressive strengths are observed in the bricks made with all three ashes, demonstrating the robustness of the proposed mix design. A brick formulation with a solids phase weight ratio of ash(70):clay(20):lime(10), liquid to solid ratio of 0.45, and 2 M NaOH produces bricks with compressive strengths between 11 and 15 MPa after 28 days curing at 30 °C. Furthermore, early strength development is observed, as more than 55% of the 28 day strength is achieved after one day curing. An economic and environmental analysis indicates that these bricks can be produced for similar costs as the clay fired brick with reduced environmental impact, making them a viable alternative in the market.
MIT Department
Massachusetts Institute of Technology. Department of Architecture
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.resconrec.2017.09.013
