WEKO3
-
RootNode
アイテム
Effect of a Nitrite/Nitrate-Based Accelerator on the Strength Development and Hydrate Formation in Cold-Weather Cementitious Materials
https://kitami-it.repo.nii.ac.jp/records/2000414
https://kitami-it.repo.nii.ac.jp/records/20004144245b3ca-24a1-4145-af85-ddcc69af7ae1
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
materials-14-01006-v2.pdf (4.5 MB)
|
.png)
|
| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-04-18 | |||||||||||||||||
| タイトル | ||||||||||||||||||
| タイトル | Effect of a Nitrite/Nitrate-Based Accelerator on the Strength Development and Hydrate Formation in Cold-Weather Cementitious Materials | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 言語 | ||||||||||||||||||
| 言語 | eng | |||||||||||||||||
| 資源タイプ | ||||||||||||||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||
| タイプ | journal article | |||||||||||||||||
| 著者 |
Akira Yoneyama
× Akira Yoneyama
× Heesup Choi
× Masumi Inoue
× Jihoon Kim
× Myungkwan Lim
× Yuhji Sudoh
|
|||||||||||||||||
| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | Recently, there has been increased use of calcium-nitrite and calcium-nitrate as the main components of chloride- and alkali-free anti-freezing agents to promote concrete hydration in cold weather concreting. As the amount of nitrite/nitrate-based accelerators increases, the hydration of tricalcium aluminate (C3A phase) and tricalcium silicate (C3S phase) in cement is accelerated, thereby improving the early strength of cement and effectively preventing initial frost damage. Nitrite/nitrate-based accelerators are used in larger amounts than usual in low temperature areas below −10 °C. However, the correlation between the hydration process and strength development in concrete containing considerable nitrite/nitrate-based accelerators remains to be clearly identified. In this study, the hydrate composition (via X-ray diffraction and nuclear magnetic resonance), pore structures (via mercury intrusion porosimetry), and crystal form (via scanning electron microscopy) were determined, and investigations were performed to elucidate the effect of nitrite/nitrate-based accelerators on the initial strength development and hydrate formation of cement. Nitrite/nitrate-AFm (aluminate-ferret-monosulfate; AFm) was produced in addition to ettringite at the initial stage of hydration of cement by adding a nitrite/nitrate-based accelerator. The amount of the hydrates was attributed to an increase in the absolute amounts of NO2− and NO3− ions reacting with Al2O3 in the tricalcium aluminate (C3A phase). Further, by effectively filling the pores, it greatly contributed to the enhancement of the strength of the hardened cement product, and the degree of the contribution tended to increase with the amount of addition. On the other hand, in addition to the occurrence of cracks due to the release of a large amount of heat of hydration, the amount of expansion and contraction may increase, and it is considered necessary to adjust the amount used for each concrete work. | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 書誌情報 |
en : Materials 巻 14, 号 4, p. 1006 |
|||||||||||||||||
| DOI | ||||||||||||||||||
| 識別子タイプ | DOI | |||||||||||||||||
| 関連識別子 | https://doi.org/10.3390/ma14041006 | |||||||||||||||||
| 出版者 | ||||||||||||||||||
| 出版者 | MDPI | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 著者版フラグ | ||||||||||||||||||
| 言語 | en | |||||||||||||||||
| 値 | publisher | |||||||||||||||||
| 出版タイプ | ||||||||||||||||||
| 出版タイプ | VoR | |||||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||
Share
Cite as
Akira Yoneyama, Heesup Choi, Masumi Inoue, Jihoon Kim, Myungkwan Lim, Yuhji Sudoh, n.d., Effect of a Nitrite/Nitrate-Based Accelerator on the Strength Development and Hydrate Formation in Cold-Weather Cementitious Materials: MDPI, 1006– p.
