Scherer – Effect of Pressure on Early Hydration

Gary P. Funkhouser, Sulapha Peethamparan, Emily Weissinger, Jie Zhang, and George Scherer


Princeton University


The kinetics of hydration of white cement and Class H cement have been examined over a range of pressure up to 20 ksi (138 MPa) and temperatures from 10 to 60˚C. Hydration kinetics were followed through chemical shrinkage (at ambient pressure), and the rheology was characterized using a consistometer. Treating the hydration as a first order reaction, the kinetic data are fully consistent with an activation energy of about 40 kJ/mole and an activation volume on the order of the volume of a water molecule. The effect of retarders on the parameters is currently being investigated.



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