Stability of Strӓtlingite in the CASH System

Abstract

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.

Department(s)

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)

1359-5997;1871-6873

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), All rights reserved.

Publication Date

01 Oct 2016

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