التفاصيل البيبلوغرافية
| العنوان: |
Impact of MgCl 2 on the mechanical properties of alite pastes at mesoscale and nanoscale |
| المؤلفون: |
Sun, Yanjie, Tao, Yong, Pellenq, Roland J. M., Poon, Chi Sun |
| المساهمون: |
Research Grants Council, University Grants Committee |
| المصدر: |
Journal of the American Ceramic Society ; volume 107, issue 8, page 5326-5337 ; ISSN 0002-7820 1551-2916 |
| بيانات النشر: |
Wiley |
| سنة النشر: |
2024 |
| المجموعة: |
Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: |
While the MgCl 2 mixing alite paste causes degradation of the modulus and hardness of C–S–H formed, the underlying degradation mechanism needs to be better understood. This study comprehensively analyzed the mechanical properties of alite pastes mixed with MgCl 2 solutions, examining the effects at both mesoscale and nanoscale. The in situ X‐ray diffraction analysis revealed that the formation of brucite occurred at a very early age together with the formation of portlandite, which may induce a loosened packing density of C−S−H and served as the primary cause of modulus and hardness degradation. We used Bayesian statistical models to fit the nanoindentation data of C−S−H. By extrapolation at a packing fraction equal to unity, we were able to extract elastic properties (modulus and hardness) of the C−S−H nanograins. The nanoscale C−S−H elastic modulus showed no significant alterations in the mechanical properties of the C−S−H nanostructures. Atomistic simulations also suggested that Mg 2+ ions preferably substitute interlayer Ca rather than intralayer Ca in C−S−H, and the Mg docking in CSH induced a very modest volume contraction. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| DOI: |
10.1111/jace.19810 |
| الاتاحة: |
http://dx.doi.org/10.1111/jace.19810 |
| Rights: |
http://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: |
edsbas.94BB31A5 |
| قاعدة البيانات: |
BASE |