Weise, Kira ; Ukrainczyk, Neven ; Duncan, Aaron ; Koenders, Eduardus (2022)
Enhanced Metakaolin Reactivity in Blended Cement with Additional Calcium Hydroxide.
In: Materials, 15 (1)
doi: 10.3390/ma15010367
Article, Bibliographie
This is the latest version of this item.
Abstract
This study aims to increase the pozzolanic reactivity of metakaolin (MK) in Portland cement (PC) blends by adding additional calcium hydroxide (CH_add) to the initial mixture. Cement paste samples were prepared with PC, MK and water with a water-to-binder ratio of 0.6. Cement replacement ratios were chosen from 5 to 40 wt.% MK. For higher replacement ratios, i.e., 20, 30 and 40 wt.% MK, CH_add was included in the mixture. CH_add-to-MK ratios of 0.1, 0.25 and 0.5 were investigated. Thermogravimetric analysis (TGA) was carried out to study the pozzolanic reactivity after 1, 7, 28 and 56 days of hydration. A modified mass balance approach was used to normalize thermogravimetric data and to calculate the calcium hydroxide (CH) consumption of samples with CH_add. Results showed that, without CH_add, a replacement ratio of 30 wt.% or higher results in the complete consumption of CH after 28 days at the latest. In these samples, the pozzolanic reaction of MK turned out to be restricted by the amount of CH available from the cement hydration. The increased amount of CH in the samples with CH_add resulted in an enhanced pozzolanic reaction of MK as confirmed by CH consumption measurements from TGA
| Item Type: | Article |
|---|---|
| Erschienen: | 2022 |
| Creators: | Weise, Kira ; Ukrainczyk, Neven ; Duncan, Aaron ; Koenders, Eduardus |
| Type of entry: | Bibliographie |
| Title: | Enhanced Metakaolin Reactivity in Blended Cement with Additional Calcium Hydroxide |
| Language: | English |
| Date: | 2022 |
| Publisher: | MDPI |
| Journal or Publication Title: | Materials |
| Volume of the journal: | 15 |
| Issue Number: | 1 |
| Collation: | 19 Seiten |
| DOI: | 10.3390/ma15010367 |
| Corresponding Links: | |
| Abstract: | This study aims to increase the pozzolanic reactivity of metakaolin (MK) in Portland cement (PC) blends by adding additional calcium hydroxide (CH_add) to the initial mixture. Cement paste samples were prepared with PC, MK and water with a water-to-binder ratio of 0.6. Cement replacement ratios were chosen from 5 to 40 wt.% MK. For higher replacement ratios, i.e., 20, 30 and 40 wt.% MK, CH_add was included in the mixture. CH_add-to-MK ratios of 0.1, 0.25 and 0.5 were investigated. Thermogravimetric analysis (TGA) was carried out to study the pozzolanic reactivity after 1, 7, 28 and 56 days of hydration. A modified mass balance approach was used to normalize thermogravimetric data and to calculate the calcium hydroxide (CH) consumption of samples with CH_add. Results showed that, without CH_add, a replacement ratio of 30 wt.% or higher results in the complete consumption of CH after 28 days at the latest. In these samples, the pozzolanic reaction of MK turned out to be restricted by the amount of CH available from the cement hydration. The increased amount of CH in the samples with CH_add resulted in an enhanced pozzolanic reaction of MK as confirmed by CH consumption measurements from TGA |
| Additional Information: | Keywords: supplementary cementitiousmaterials (SCMs); pozzolanic reaction; calcined clay;metakaolin; thermogravimetric analysis (TGA); calcium hydroxide |
| Classification DDC: | 600 Technology, medicine, applied sciences > 600 Technology |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials |
| Date Deposited: | 02 Aug 2024 12:40 |
| Last Modified: | 02 Aug 2024 12:40 |
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| Suche nach Titel in: | TUfind oder in Google |
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Enhanced Metakaolin Reactivity in Blended Cement with Additional Calcium Hydroxide. (deposited 03 May 2022 11:16)
- Enhanced Metakaolin Reactivity in Blended Cement with Additional Calcium Hydroxide. (deposited 02 Aug 2024 12:40) [Currently Displayed]
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