| 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 |
| 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. |
| https://kirj.ee/wp-content/plugins/kirj/pub/OS-3-2024-145-162_20240731113454.pdf |
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