Speaker
Description
TThis study investigates the hydration behavior of quaternary binder systems comprising calcium aluminate cement (CAC), ordinary Portland cement (OPC), calcium sulfate (C$), and various supplementary cementitious materials (SCMs) under different curing temperatures. The binder composition was fixed at CAC:OPC:C$:SCM = 53:13:24:10 by mass. SCMs, including ground granulated blast furnace slag (GGBFS) and limestone, were selected to evaluate their influence on hydration kinetics, phase development, and strength progression. Natural gypsum was used as the calcium sulfate source. To assess the temperature sensitivity of each formulation, curing was carried out at 5 °C, 25 °C, and 45 °C. Isothermal calorimetry was used to monitor hydration reactions, while crystalline phase evolution was tracked via X-ray diffraction (XRD) at 1, 3, 7, and 28 days. Additional analyses included thermogravimetric analysis (TGA), setting time (Vicat), and mechanical performance testing at 28 days. Results showed that both the SCM type and curing temperature significantly affected hydration kinetics and product formation. Slag enhanced early-age reactivity and caused earlier setting, particularly at elevated temperatures. In contrast, limestone exhibited delayed hydration, especially at lower temperatures. The interaction between SCMs and temperature also influenced the extent of ettringite formation.
Affiliations
Sabancı Technology Center GmbH, Freisinger Landstraße 50 Garching, Munich, Germany, 85748, ozge.demirdogan@sabancibs.com
| Keywords | calcium aluminate cement, supplementary cementitious materials, hydration behavior, curing temperature, XRD |
|---|