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3-Dimensional insight into zonation within slag rims of aged blended cement.
- Source :
-
Cement & Concrete Research . Feb2024, Vol. 176, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Through the integration of SEM-BSE and TEM, we gained a comprehensive 3-dimensional understanding of different distribution patterns of inner hydration products of slag. For fully hydrated small slag grains, two distinct sub-zones were formed in the rims. Lath-like, well-crystalline hydrotalcite-like crystals were found to precipitate, grow, and accumulate near the boundary, forming a layer with a thickness slightly exceeding 0.5 μm. In the center, entrapped calcium and silicon played roles in the formation of a homogeneous and fibrous C−(A)–S–H gel phase. The concentration equilibrium between cement matrix and grain core led to the establishment of a similar grey pixel value and Ca/Si atomic ratio of gel phase at ~1.10. As the size of slag grains increased, three sub-zones became visible. Hydrotalcite-like phase was enriched near the boundary, followed by a sandwiched area abundant in C–(A)–S–H gel phase. Due to the low mobility and increased migration distance, newly released magnesium from reaction front accumulated locally to form a new Mg-rich region. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SLAG
*SLAG cement
*CEMENT
*GRAIN size
Subjects
Details
- Language :
- English
- ISSN :
- 00088846
- Volume :
- 176
- Database :
- Academic Search Index
- Journal :
- Cement & Concrete Research
- Publication Type :
- Academic Journal
- Accession number :
- 174666376
- Full Text :
- https://doi.org/10.1016/j.cemconres.2023.107396