Abstract
The calorimetric measurements together with the experiments aimed in the characterization of pore solution and the other analyses relating to the interaction of cement paste with sulphate and nitrate solutions of various concentrations are reported. These salts modify the rate of cement hydration at early age. In the presence of sulphates, the formation of some well-defined calcium sulphates or calcium sulphoaluminates can be found. In case of nitrates, there are no additional products—the nitrate compounds are well soluble, and they do not crystallize in cement systems. However, one can observe that the concentration of ions in the liquid phase is modified and the properties of hydration product are changed, as the formation of products from the liquid phase is disturbed.
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