Stability of Strӓtlingite in the CASH System
Strӓtlingite, a siliceous AFm-type phase associated with blended cement hydration, is often assigned a fixed composition, 2CaO·Al2O3·SiO2·8H2O, but our knowledge of its stability and compatibility with other phases is limited. The phase relations and thermal stability of strӓtlingite in the CASH system are reported. Strӓtlingite 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 ± 5 °C: above which it progressively decomposes to other solids, mainly hydrogarnet solid solution.
M. U. Okoronkwo and F. P. Glasser, "Stability of Strӓtlingite in the CASH System," Materials and Structures, vol. 49, no. 10, pp. 4305-4318, Kluwer Academic Publishers, Oct 2016.
The definitive version is available at https://doi.org/10.1617/s11527-015-0789-x
Chemical and Biochemical Engineering
Keywords and Phrases
C-S-H; Hydrogarnet solid solution; Stability; Stratlingite; Thermal analysis; X-ray diffraction
International Standard Serial Number (ISSN)
Article - Journal
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01 Oct 2016