دورية أكاديمية
Effect of Fly Ash and Metakaolin on Properties and Microstructure of Magnesium Oxysulfate Cement
| العنوان: | Effect of Fly Ash and Metakaolin on Properties and Microstructure of Magnesium Oxysulfate Cement |
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| المؤلفون: | Tong Liu, Chunqing Li, Li Li, Wenqiang Fan, Yudong Dong, Huihui Liang, Hongjian Yang |
| المصدر: | Materials, Vol 15, Iss 4, p 1334 (2022) |
| بيانات النشر: | MDPI AG, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Technology LCC:Electrical engineering. Electronics. Nuclear engineering LCC:Engineering (General). Civil engineering (General) LCC:Microscopy LCC:Descriptive and experimental mechanics |
| مصطلحات موضوعية: | MOSC, metakaolin, mechanical properties, water resistance, microstructure, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85 |
| الوصف: | To improve the mechanical performance and lower the production cost of magnesium oxysulfate cement (MOSC), this article investigates the effects of single and compounded addition of metakaolin (MK) and/or fly ash (FA) on the setting time, mechanical strength, water resistance, hydration product, composition, and microstructure of the resulting cement. MOSC samples with different proportions, ranging from 0 to 30 wt.%, of FA and/or MK substituting magnesium oxide (MgO) were prepared. The microstructure was explored by scanning electron microscopy, X-ray diffraction, and mercury intrusion porosimetry. The findings suggest that adding FA can delay the setting of MOSC; however, the effect of adding MK to MOSC was reversed. Furthermore, the phase composition of the MOSC hydration products was unaltered upon adding FA and/or MK, but thicker and longer 517 phase crystals were observed. FA and MK can effectively fill the large pores of MOSC through filling and nucleation effects, reduce the pore size, and form a denser microstructure, thereby improving its mechanical properties. The optimal MOSC sample was found by substituting 10 wt.% of both FA and MK, resulting in a cement that exhibited a short setting time and an incredibly high mechanical strength and density. These findings will further the development of stronger, more cost-efficient, and more water-resistant MOSC products. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1996-1944 79867464 |
| Relation: | https://www.mdpi.com/1996-1944/15/4/1334; https://doaj.org/toc/1996-1944 |
| DOI: | 10.3390/ma15041334 |
| URL الوصول: | https://doaj.org/article/8203b7986746415b96c44d37f66063a4 |
| رقم الأكسشن: | edsdoj.8203b7986746415b96c44d37f66063a4 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 19961944 79867464 |
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| DOI: | 10.3390/ma15041334 |