| Title |
Phase transformation and strength of hydrated circulating fluidised bed combustion ash sediment in an open environment over 15 years: implications for the long-term stability of ash waste plateaus |
| ID_Doc |
13605 |
| Authors |
Konist, A; Paaver, P; Pihu, T; Kirsimäe, K |
| Title |
Phase transformation and strength of hydrated circulating fluidised bed combustion ash sediment in an open environment over 15 years: implications for the long-term stability of ash waste plateaus |
| Year |
2024 |
| Published |
Oil Shale, 41, 3 |
| DOI |
10.3176/oil.2024.3.01 |
| Abstract |
Low-temperature circulating fluidised bed combustion (CFBC) of oil shale results in Ca-rich ashes with low pozzolanic properties, raising concerns regarding the long-term stability of ash depositories. This paper presents findings from a long-term field study investigating the mineral and chemical transformations of total CFBC ash sediments over a 15-year period. The study reveals that the pozzolanic properties of CFBC ashes are primarily influenced by the formation of Ca-Al sulphate mineral ettringite and the compactness of sediment. The compaction of ashes during deposition contributes to the development of a dense microstructure, providing uniaxial compressive strength that exceeds 20 MPa. Our findings suggest that compacted and hydrated CFBC ashes are sufficiently stable in ash deposits, holding promise as a sustainable alternative for cement-free construction materials. |
| Author Keywords |
CFBC ashes; strength development; long-term stability |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001282880700001 |
| WoS Category |
Energy & Fuels; Engineering, Petroleum |
| Research Area |
Energy & Fuels; Engineering |
| PDF |
https://kirj.ee/wp-content/plugins/kirj/pub/OS-3-2024-145-162_20240731113454.pdf
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