Moller, James (2023) Harvested Ash as Pozzolanic substitute in concrete. [USQ Project]
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Abstract
Fly Ash is produced when coal is burnt to generate energy, for decades the concrete industry has used Fly Ash to improve concrete performance and mitigate long term risks in concrete. Since the energy sector is moving away from coal fired energy in Australia and globally, the production of Fly Ash will cease on our shores forcing Australian Ready Mixed Concrete suppliers to rely fully on the Nations that continue to use coal fired energy for the supply of Fly Ash. Throughout the era of coal fired energy being used in Australia, power plants have stored a percentage of the Fly Ash produced in Ash Dams.
This study makes use of some of the stored Ash, known as Harvested Ash (HA) as a substitute for fine aggregates to investigate the viability of use as sand in achieving a pozzolanic reaction. This is carried out by using a typical set of commercial concrete raw materials and typical S40 MPa mix design to carry out trials substituting varying portions of HA for the Fine aggregate portion replacing on volume basis. By fixing the Water/Total Binder ratio, including the HA addition, while increasing the Water/GP ratio relative to HA addition. Multiple hardened properties tested for comparison between each supplemented percentage of HA to analyse the pozzolanic contribution to the results. The pozzolanic reaction was successfully confirmed and the cement efficiency index was established to be comparable with the fine grade classified fly ash supplied from the same source.
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| Item Type: | USQ Project |
|---|---|
| Item Status: | Live Archive |
| Faculty/School / Institute/Centre: | Current – Faculty of Health, Engineering and Sciences - School of Engineering (1 Jan 2022 -) |
| Supervisors: | Lokuge, Weena |
| Qualification: | Bachelor of Engineering (Honours) (Civil) |
| Date Deposited: | 30 Sep 2025 03:29 |
| Last Modified: | 30 Sep 2025 03:29 |
| Uncontrolled Keywords: | Fly Ash; concrete; substitute |
| URI: | https://sear.unisq.edu.au/id/eprint/52974 |
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