Abstract
Stratlingite, a siliceous AFm-type phase associated with blended cement hydration, is often assigned a fixed composition, 2CaO center dot Al2O3 center dot SiO2 center dot 8H(2)O, but our knowledge of its stability and compatibility with other phases is limited. The phase relations and thermal stability of stratlingite in the CASH system are reported. Stratlingite shows a relatively fixed composition and is compatible with C-S-H and hydrogarnet solid solution at appropriate temperatures but is not compatible with portlandite and decomposes in its presence. It is stable in cement hydrate systems high in aluminosilicate content. Its stability decreases with increasing temperature, with an upper limit of stability approximately 90 +/- A 5 A degrees C: above which it progressively decomposes to other solids, mainly hydrogarnet solid solution.
| Original language | English |
|---|---|
| Pages (from-to) | 4305-4318 |
| Number of pages | 14 |
| Journal | Materials and Structures/Materiaux et Constructions |
| Volume | 49 |
| Issue number | 10 |
| Early online date | 4 Jan 2016 |
| DOIs | |
| Publication status | Published - Oct 2016 |
Bibliographical note
AcknowledgmentsThe TETFund Nigeria and Abia State University Uturu are acknowledged for financial support.
Keywords
- thermal analysis
- X-ray diffraction
- stability
- stratlingite
- C-S-H
- hydrogarnet solid solution
- calcium silicate hydrate
- high-alumina cement
- Portland-cement
- fly-ash
- sintering behavior
- metakaolin
- pastes
- phases
- microstructure