Abstract: In order to explain the effect of air entrainment and the type of cement on the properties of fresh mortar, there were carried some tests: bulk density, flow and air content of 10 air-entrained mortar and 10 non-air-entrained mortars made of ordinary Portland cement CEM I 42.5 R and blended Portland cements: slag-limestone CEM II/AM (S-LL) 52.5 N, fly ash and limestone CEM II/BM (V-LL) 32.5 R, fly ash (FA) CEM II/BV 32.5 R and blast furnace slag (BFS) CEM III/A 32.5 N. Based on the study, there has been found that it is difficult to air entrain the mortars with various types of cement to the same content of air, and this requires to carry out a number of tests to determine the appropriate amounts of air-entraining admixture. The air entrainment of limestone cement mortar does not significantly change its flow. The air entrainment of blast furnace slag and fly ash cement mortars increases their workability. The lowest content of air was stated in non-air-entrained mortars with fly ash cement, the highest air content was observed with blast furnace slag cement. According to the results the bulk density of mortars is inversely proportional to the
amount of air. This confirms the test results of air content entrainment by pressure.
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