The influence of different additions on portland cement hydration heat

Abstract This paper presents the results obtained using the Langavant Calorimeter method on portland cements with different addition materials that are commonly used in the manufacture of commercial cements. The effects of these materials on the hydration heat with respect to a control cement were studied. The first hours show that most of the additions, which present highet activity at early stages, increase the hydration heat of their mixed cements in relation to the control cement. The use of pozzolans reduces the heat given off by the cements during hydration. However, the reactions of the pozzolanic materials with the lime also produce heat and the decrease should not be proportional to the level of clinker substitution in the mixed cements.