3.2.1. Properties of Concrete Mixture

The properties of concrete mixture are presented in Table 7. The consistency (fall cone method) of concrete mixtures at w/c = 0.60 corresponded to class S3 for concrete mixture with cement C(30S-10LL) and classes S2 for other cements. Reduction of the water content to the level w/c = 0.35 caused a decrease in consistency to class S1.

The density of all concrete mixtures with the ratio w/c = 0.60 was similar and ranged from 2350 to 2360 kg/m3. The air content was low and ranged from 0.6% to 1.0%. Decreasing the water-cement ratio to the level w/c = 0.35 resulted in an increase in the density of concrete mixtures by about 70–80 kg/m<sup>3</sup> and an increase in air content to 1.6–2%. The increase in aeration of the concrete mixture is typical of using liquefying admixture.



\* Consistency class acc. EN 12350-2:2011 [30].
