期刊
CASE STUDIES IN CONSTRUCTION MATERIALS
卷 19, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.cscm.2023.e02589
关键词
C -S -H; Morphology; Scanning electron microscope; Polysaccharide additive
This study systematically investigated the microstructure development of both outer and inner C-S-H gel in real cement pastes using high-resolution scanning electron microscopy. It reported the evolution of outer C-S-H morphology from one-dimensional needle-like morphology to three-dimensional honeycomb-like morphology, and found more distinctive deformation and compaction in inner C-S-H morphology evolution. It also challenged the assumption that calcium concentration is the sole determinant of C-S-H morphology change.
Calcium silicate hydrate (C-S-H) governs the binding of cement-based materials, influencing various properties through its microstructure. However, understanding C-S-H's microstructure development and morphological evolution mechanisms remains incomplete. This study system-atically investigated the microstructure development of both outer and inner C-S-H gel in real cement pastes using high-resolution scanning electron microscopy. For the first time, we reported the evolution of outer C-S-H from one-dimensional needle-like morphology to three-dimensional honeycomb-like morphology after reaching the maximum heat flow, involving interconnection between adjacent C-S-H needles and micro-assembly of bonded structure. Inner C-S-H, formed in confined spaces, mirrors outer C-S-H morphology evolution patterns, but with more distinctive deformation and compaction at later stages. A starch-based polysaccharide additive, temperature rise inhibitor (TRI), was then used to regulate cement hydration and C-S-H precipitation. With distinctive exothermic processes and pore solution environments, we validated the C-S-H morphology-calcium concentration correlation. However, our findings challenge calcium con-centration as the sole determinant of C-S-H morphology change; it appears rather as a consequence of increasing degree of cement hydration.
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