Szczegóły publikacji
Opis bibliograficzny
Rheological characterisation of clay-cement sealing suspensions with fractionated coal fly ashes / Jurij DELIHOWSKI, Piotr IZAK // Scientific Reports [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2045-2322 . — 2026 — vol. 16 art. no. 2856, s. 1–33. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 28–33, Abstr. — Publikacja dostępna online od: 2026-01-22
Autorzy (2)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 165805 |
|---|---|
| Data dodania do BaDAP | 2026-02-03 |
| Tekst źródłowy | URL |
| DOI | 10.1038/s41598-025-30793-w |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Scientific Reports |
Abstract
This study investigates the rheological behaviour of clay–cement sealing suspensions modified with dry size-fractionated coal fly ashes of contrasting chemical composition. High-calcium S1 ashes and siliceous S2 ashes were separated into ultrafine (< 10 μm), fine (5–20 μm), and middle (20–100 μm) fractions to isolate size-dependent reactivity. Rotational and oscillatory rheometry demonstrate that Ca-rich fractions induce rapid structuration: at 20wt% ash addition, the Bingham yield stress rises from ~ 20–30 Pa in reference suspensions to > 150 Pa, and exceeds 400 Pa at 30wt% S1 loading, accompanied by steep increases in storage modulus (G′ up to 10⁷–10⁸Pa for ultrafine fractions). In contrast, S2 ashes disperse the clay–cement network, lowering yield stress to ~ 15–60 Pa even at 40 wt% replacement and maintaining moderate viscoelastic stiffness (G′~10⁴–10⁵Pa). Particle fineness amplifies these trends: S1.UF promotes early hydration products precipitation and slip-layer formation, whereas S2.UF preserves fluidity. Sodium-silicate activation introduces a distinct threshold—at 1.0–1.5wt% Na₂SiO₃ the S1 systems undergo a sol–gel transition, with τ₀ surging above 200 Pa, while S2 systems respond gradually. These results quantitatively shows how ash chemistry and granulometry govern early yield stress, viscosity, and G′/G″ ratios, and identify composition windows for either rapid sealing (Ca-rich, fine fractions) or long-distance pumpability (Si-rich, fine fractions). The work demonstrates that fractionated fly ash provides an effective design tool for tailoring rheology of low-cement, sustainable sealing slurries for hydraulic and geotechnical applications. © The Author(s) 2026.
