Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 106, Issue 3, Pages 869-874Publisher
SPRINGER
DOI: 10.1007/s10973-011-1651-1
Keywords
Fly ash; Fluorgypsum; Hydration heat; Compressive strength
Funding
- National Natural Science Foundation of China [21003014]
- Major Science and Technology Project of Hunan Province [2009FJ1009-3, 2007NK3123]
- Hunan Provincial Scientific and Technological Projects [2010CK3020, 2010FJ3167]
- Hunan Provincial Natural Science Foundation of China [09JJ3035]
- Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation (Changsha university of Science Technology) [20090011, 2010CL07]
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The hydration heat of pure cement, fly ash single-doped cement, as well as fly ash and fluorgypsum co-doped cement were investigated by means of micro-calorimetry with an eight-channel micro-calorimeter. The results showed that the hydration heat and the hydration rate could be reduced significantly by fly ash and fluorgypsum. However, the reduction was not proportional to the loading of dopant. The exothermic peak of the co-doped cement was appeared earlier than that of the single-doped cement. As the temperature decreased, the hydration heat and the hydration rate of both the doped cement were reduced, and the exothermic peak appeared later. The effect of fly ash and fluorgypsum on the compressive strength of cement was also investigated. The results revealed that the early compressive strength of concrete made up of the co-doped cement was largely higher than that of the single-doped cement. Based on the experiment results obtained in this article, we could conclude that fluorgypsum is a suitable additive for the single-doped cement.
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