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- W3036642238 abstract "Abstract Alite (Ca 3 SiO 5 : C 3 S * ) and calcium aluminate (Ca 3 Al 2 O 6 : C 3 A) are the major phases in Portland cement, which have an essential role in the development of early age properties. The effects of gypsum content, fineness, and Na 2 SO 4 addition on the early‐stage hydration kinetics are investigated for polyphase (co‐sintered) Ca 3 SiO 5 ‐Ca 3 Al 2 O 6 model systems using calorimetry, X‐ ray diffraction, thermal analysis, and solid‐state 27 Al and 29 Si nuclear magnetic resonance (NMR) spectroscopy. The results demonstrate that the hydration of C 3 A significantly affects the hydration of C 3 S. The C 3 S and C 3 A hydration is hindered considerably in severely over‐sulfated systems (where C 3 A hydration is suppressed due to a very high gypsum content) and systems with additional Na 2 SO 4 . Although there is a considerable amount of Al incorporation in the C‐S‐H phase, no clear trends with respect to gypsum content, hydration age or Na 2 SO 4 addition are observed for the Al IV /Si ratios of the C‐S‐H phase determined from 29 Si NMR. With the addition of Na 2 SO 4 , recrystallization of ettringite from the AFm phases is postponed from 1 day to 7 days. *Cement chemistry notation: C‐CaO, S‐SiO 2 , A‐Al 2 O 3 , ‐SO 3 , N‐Na 2 O." @default.
- W3036642238 created "2020-06-25" @default.
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- W3036642238 date "2020-07-01" @default.
- W3036642238 modified "2023-09-27" @default.
- W3036642238 title "Hydration of polyphase Ca<sub>3</sub>SiO<sub>5</sub>‐Ca<sub>3</sub>Al<sub>2</sub>O<sub>6</sub> in the presence of gypsum and Na<sub>2</sub>SO<sub>4</sub>" @default.
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- W3036642238 doi "https://doi.org/10.1111/jace.17321" @default.
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