Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills
When cemented paste backfill (CPB) is used to fill underground stopes opened in permafrost, depending on the distance from the permafrost wall, the curing temperature within the CPB matrix decreases progressively over time until equilibrium with the permafrost is reached (after several years). In th...
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ftmdpi:oai:mdpi.com:/2075-163X/9/3/172/ 2023-08-20T04:09:10+02:00 Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills Mamert Mbonimpa Parrein Kwizera Tikou Belem agris 2019-03-11 application/pdf https://doi.org/10.3390/min9030172 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/min9030172 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 9; Issue 3; Pages: 172 permafrost cemented paste fill (CPB) HE binder saline mixing water declining curing temperature UCS Text 2019 ftmdpi https://doi.org/10.3390/min9030172 2023-07-31T22:06:22Z When cemented paste backfill (CPB) is used to fill underground stopes opened in permafrost, depending on the distance from the permafrost wall, the curing temperature within the CPB matrix decreases progressively over time until equilibrium with the permafrost is reached (after several years). In this study, the influence of declining curing temperature (above freezing temperature) on the evolution of the unconfined compressive strength (UCS) of CPB over 28 days’ curing is investigated. CPB mixtures were prepared with a high early (HE) cement and a blend of 80% slag and 20% General Use cement (S-GU) at 5% and 3% contents and cured at room temperature in a humidity chamber and under decreasing temperatures in a temperature-controlled chamber. Results indicate that UCS is higher for CPB cured at room temperature than under declining temperatures. UCS increases progressively from the stope wall toward the inside of the CPB mass. Under declines in curing temperature, HE cement provides better short-term compressive strength than does S-GU binder. In addition, the gradual decline in temperature does not appear to affect the fact that the higher the binder proportion, the greater the strength development. Therefore, UCS is higher for samples prepared with 5% than 3% HE cement. Findings are discussed in terms of practical applications. Text permafrost MDPI Open Access Publishing Minerals 9 3 172 |
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MDPI Open Access Publishing |
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English |
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permafrost cemented paste fill (CPB) HE binder saline mixing water declining curing temperature UCS |
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permafrost cemented paste fill (CPB) HE binder saline mixing water declining curing temperature UCS Mamert Mbonimpa Parrein Kwizera Tikou Belem Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
topic_facet |
permafrost cemented paste fill (CPB) HE binder saline mixing water declining curing temperature UCS |
description |
When cemented paste backfill (CPB) is used to fill underground stopes opened in permafrost, depending on the distance from the permafrost wall, the curing temperature within the CPB matrix decreases progressively over time until equilibrium with the permafrost is reached (after several years). In this study, the influence of declining curing temperature (above freezing temperature) on the evolution of the unconfined compressive strength (UCS) of CPB over 28 days’ curing is investigated. CPB mixtures were prepared with a high early (HE) cement and a blend of 80% slag and 20% General Use cement (S-GU) at 5% and 3% contents and cured at room temperature in a humidity chamber and under decreasing temperatures in a temperature-controlled chamber. Results indicate that UCS is higher for CPB cured at room temperature than under declining temperatures. UCS increases progressively from the stope wall toward the inside of the CPB mass. Under declines in curing temperature, HE cement provides better short-term compressive strength than does S-GU binder. In addition, the gradual decline in temperature does not appear to affect the fact that the higher the binder proportion, the greater the strength development. Therefore, UCS is higher for samples prepared with 5% than 3% HE cement. Findings are discussed in terms of practical applications. |
format |
Text |
author |
Mamert Mbonimpa Parrein Kwizera Tikou Belem |
author_facet |
Mamert Mbonimpa Parrein Kwizera Tikou Belem |
author_sort |
Mamert Mbonimpa |
title |
Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
title_short |
Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
title_full |
Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
title_fullStr |
Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
title_full_unstemmed |
Mine Backfilling in the Permafrost, Part II: Effect of Declining Curing Temperature on the Short-Term Unconfined Compressive Strength of Cemented Paste Backfills |
title_sort |
mine backfilling in the permafrost, part ii: effect of declining curing temperature on the short-term unconfined compressive strength of cemented paste backfills |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2019 |
url |
https://doi.org/10.3390/min9030172 |
op_coverage |
agris |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Minerals; Volume 9; Issue 3; Pages: 172 |
op_relation |
https://dx.doi.org/10.3390/min9030172 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min9030172 |
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Minerals |
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9 |
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3 |
container_start_page |
172 |
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1774721951890145280 |