Speaker
Description
Mayenite based cements allow for reduction of the global warming potential of dry-mix recipes compared to typical ternary binder system. This is due to the fact that you can achieve the same early age properties with this technology at a lower total binder content of the recipe. Typically, these formulations are poor in Portland cement and calcium sulfates are added to maximize the early ettringite yield during hydration. The type and amount of calcium sulfate plays a critical role in the hydration behavior of mayenite-based systems and not a lot of research has been performed on this topic. In this work we investigated the influence the types and amounts of calcium sulfates have on the hydration of a C12A7-based cement. We investigated both a model system as well as a self-leveling underlayment recipe based on this technology.
It is shown that the reactivity of the calcium sulfate plays a significant role in the early strength build-up and ettringite formation rates. In addition, long term expansion is also significantly influenced by changes in the calcium sulfate types and different hydrate phase assemblages are observed.
This work provides a basis for further investigations within this system, in which, for example, the influence of various retarders and the amount of Portland cement on the hydration behavior and mechanical performance can be examined.
Affiliations
Sabanci Technology Center GmbH, Freisinger Landstraße 50, Garching bei München, 85748, Germany, julian.wolf@sabancibs.com
ÇİMSA ÇİMENTO
SANAYİ VE TİCARET A.Ş, TOROSLAR MAH. TEKKE CAD. YENİTAŞKENT – AKDENİZ, Mersin, 33013, TÜRKIYE
| Keywords | c12a7, hydration, early strength, hemi hydrate, anhydrite |
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