| Naslov: | Enhancing densification of metakaolin-based geopolymers via the cold sintering process |
|---|
| Avtorji: | ID Jabr, Abdullah (Avtor)
ID Škapin, Srečo D. (Avtor)
ID Tominc, Sara (Avtor)
ID Daneu, Nina (Avtor)
ID Koenig, Jakob (Avtor)
ID Ducman, Vilma (Avtor)
ID Korat Bensa, Lidija (Avtor)
ID Bermejo, Raúl (Avtor)
ID Spreitzer, Matjaž (Avtor) |
|---|
| Datoteke: |  URL - Izvorni URL, za dostop obiščite https://doi.org/10.1016/j.oceram.2025.100863
 PDF - Predstavitvena datoteka, prenos (7,70 MB)
MD5: 7F0A08C8CF3A34928E460F10DE21264D
|
|---|
| Jezik: | Angleški jezik |
|---|
| Tipologija: | 1.01 - Izvirni znanstveni članek |
|---|
| Organizacija: |  ZAG - Zavod za gradbeništvo Slovenije
|
|---|
| Povzetek: | Clay-based materials typically require high-temperature processing (>900 ◦C), resulting in high energy consumption. This study explores cold sintering of metakaolin (MK) powders to achieve high mechanical strength at significantly lower processing temperatures. By applying uniaxial pressure of 400 MPa and heating to only 240 ◦ C in the presence of 15 mol/L NaOH solution, successful densification of structurally sound and dense samples with an average density of 2.16 g/cm³ and a biaxial flexural strength of ~35 MPa was achieved. This strength surpasses that of conventionally sintered MK (1470 ◦C) by ~30 %. Densification was found to be governed by synergistic mechanisms involving MK exfoliation, conformal sintering around aggregates, and the precipitation of an amorphous sodium aluminosilicate hydrate phase. Crack formation was avoided through process optimization and verified using X-ray micro-computed tomography. These findings offer new insights into the chemo- mechanical mechanisms of cold sintering and demonstrate its potential as an efficient route for producing structural materials. |
|---|
| Ključne besede: | cold sintering, metakaolin, geopolymer, delaminations, exfoliation |
|---|
| Status publikacije: | Objavljeno |
|---|
| Verzija publikacije: | Objavljena publikacija |
|---|
| Datum objave: | 09.10.2025 |
|---|
| Založnik: | Elsevier Ltd |
|---|
| Leto izida: | 2025 |
|---|
| Št. strani: | str. 1-10 |
|---|
| Številčenje: | Vol. 24, [article no.] 100863 |
|---|
| PID: | 20.500.12556/DiRROS-23872  |
|---|
| UDK: | 621.7 |
|---|
| ISSN pri članku: | 2666-5395 |
|---|
| DOI: | 10.1016/j.oceram.2025.100863 |
|---|
| COBISS.SI-ID: | 253167107 |
|---|
| Avtorske pravice: | © 2025 The Authors |
|---|
| Datum objave v DiRROS: | 15.10.2025 |
|---|
| Število ogledov: | 186 |
|---|
| Število prenosov: | 83 |
|---|
| Metapodatki: |    |
|---|
|
:
|
Kopiraj citat |
|---|
| | | | Objavi na: |  |
|---|
Postavite miškin kazalec na naslov za izpis povzetka. Klik na naslov izpiše
podrobnosti ali sproži prenos. |
