Wpływ domieszek chemicznych o różnym działaniu na właściwości zaczynów i zapraw cementowych

The presented research is aimed at demonstrating differences in the effectiveness of action between chemical admixtures available on the domestic market with a similar and different course of action in cement pastes and mortars. Admixtures with aeration, aeration and plasticizing, sealing, acceleration of setting time, and liquefaction effect came from different manufacturers and were used in the amount recommended by them. It has been shown that, in the case of chemical admixtures with different direction of effect, their effectiveness in cement mortars is conditioned by the mechanism of their action. However, for the admixtures with the same direction of action, but coming from different manufacturers, the decisive influence on their effectiveness in mortars is their dosage amount and the type and concentration of organic compounds used to produce these admixtures. The greatest improvement in the properties of mortar, demonstrated by their increased compressive strength, slight linear changes and lower absorbability, was obtained in the presence of liquidizing admixtures and slightly inferior in the presence of ones that accelerate setting time, plasticize, seal or aerate. On the other hand, the least beneficial effect on improving the functional properties of mortars was observed in the presence of aeration and plasticizing admixtures.