دورية أكاديمية
Influence of Ca2+ on Early Degradation of Cast-In-Situ Mortar Induced by Sulfate-Magnesium Multiple Combined Attack
| العنوان: | Influence of Ca2+ on Early Degradation of Cast-In-Situ Mortar Induced by Sulfate-Magnesium Multiple Combined Attack |
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| المؤلفون: | Gaowen Zhao, Mengzhen Guo, Shaomin Li, Xiaolin Weng, Shijun Ding, Fangzhou Han, Haoran Wang |
| المصدر: | Materials, Vol 15, Iss 16, p 5752 (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: | cast-in-situ mortar, internal magnesium attack, internal–external sulfate attack, Ca2+, 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: | Early degradation of cast-in-situ concrete induced by multiple internal–external sulfate combined attacks significantly affects the development of concrete strength. An experimental study regarding the effects of Ca2+ on the early degradation of cast-in-situ mortars subjected to internal–external sulfate and magnesium combined attacks is investigated in this paper. In particular, a specific method for accurately simulating the degradation of cast-in-situ structures was proposed in this experiment. Physical properties (including weight, size changes, and porosity), mechanical properties (including flexural strength and compressive strength), sulfate concentration, and microstructural properties were monitored during 28 days of immersion. The results show that an internal sulfate and magnesium combined attack (ISA-IMA) obviously retards the development of early strength and accelerates the degradation induced by external sulfate attack (ESA). The diffusion path of sulfate ions from outside is blocked by flake-shaped magnesium hydrates, delaying the penetration of external sulfate attacks. However, it is far from neutralizing the strength loss induced by an internal magnesium attack (IMA) at an early age. Premixed excessive Ca2+ would improve the strength development and pore structure of concrete or mortar, enhancing durability against corrosive conditions. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 15165752 1996-1944 |
| Relation: | https://www.mdpi.com/1996-1944/15/16/5752; https://doaj.org/toc/1996-1944 |
| DOI: | 10.3390/ma15165752 |
| URL الوصول: | https://doaj.org/article/d5b2b656c557418297c5939ada00af5f |
| رقم الأكسشن: | edsdoj.5b2b656c557418297c5939ada00af5f |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 15165752 19961944 |
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| DOI: | 10.3390/ma15165752 |