In order to check the influence of temperature and morphology in pozzolanic reations, different types of silica were tested for a range of temperature. The pH measurements were utilized to plot the activate energy curve and check the advance of reaction. This range of data allows us to conclude that the better condition to conduct these tests is 75ºC. Besides, fumed silica produced by Tecnosil presentes lower induction time and better fitting when compared to theoretical curve and when linearize