The hydration of a paste consisting of 25 wt.% calcium aluminate cement, 12.5 wt.% Portland cement, 12.5 wt.% β-calcium sulfate hemihydrate and 50 wt.% water was studied at 20°C and 100% relative humidity, using in-situ synchrotron X-ray powder diffraction, isothermal conduction calorimetry and dilatometric measurements. Initially, gypsum and ettringite form, while hemihydrate is consumed (0-45 min). Ettringite then continues forming at the expense of gypsum. When gypsum is depleted after 2 h and 45 min, aluminate-AFm starts forming, while the amount of ettringite stays constant up to 7 h. The first peak in the heat rate curve includes contributions from mechanical mixing, initial wetting and dissolution plus the formation of ettringite and gypsum, the second maximum involves the replacement of gypsum by ettringite, and the third corresponds to the formation of aluminate-AFm. The replacement of gypsum by ettringite is accompanied by an average linear expansion of 0.7%. © 2001 Elsevier Science Ltd. All rights reserved.
CITATION STYLE
Evju, C., & Hansen, S. (2001). Expansive properties of ettringite in a mixture of calcium aluminate cement, Portland cement and β-calcium sulfate hemihydrate. Cement and Concrete Research, 31(2), 257–261. https://doi.org/10.1016/S0008-8846(00)00495-6
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