The Durability of Concrete with the Participation …
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Table 2 Test results of consistency, air content (with Vebe and water column methods) and
density of the concrete mix of CEM 42.5R cement without and with the content of hydrophilic
and hydrophobic nanosilica, as well as silica fume and superplasticizer
Identification
of concrete
mix
Composition
of concrete
mix
Qty of n
SiO 2
Consistency
Air
content
Density
of mix
(%)
Vebe
(s)
Class Cone
slump
(cm)
Class (%)
(kg/m 3 )
M1
100% C
–
6
V3
14
S3
1.8
2310
M2
C+8% D
–
6
V3
10
S3
1.6
2290
M3
C+0.5% HI
0.5
2
V4
17.5
S4
1.5
2320
M4
C+0.5% HF
0.5
3
V4
18
S4
1.9
2330
M5
C+0.5%
HI+8% D
0.5
4
V4
9.4
S2
1.4
2310
M6
C+0.5%
HF+8% D
0.5
7
V3
7.2
S2
0.8
2310
M7
C+0.5%
HI+8%
D+0.4% SP
0.5
2
V4
17.5
S4
1.9
2330
M8
C+0.5%
HF+8%
D+0.4% SP
0.5
2
V4
17
S4
1.8
2330
M9
C+1.5% HI
1.5
4
V4
17.5
S4
1.9
2320
M10
C+1.5% HF
1.5
3
V4
17.5
S4
1.6
2320
M11
C+1.5%
HI+8% D
1.5
3
V4
7
S2
1.6
2310
M12
C+1.5%
HF+8% D
1.5
6
V3
8.5
S2
1.4
2320
M13
C+1.5%
HI+8%
D+0.4% SP
1.5
4
V4
20
S4
1.7
2330
M14
C+1.5%
HF+8%
D+0.4% SP
1.5
3
V4
18.5
S4
1.9
2330
Expanded uncertainty of the measurement
Consistency tested by the slump-test ±1
(cm)
Air content ±0.5 (%)
Density of mix ±10 (kg/m 3 )
While introduction of silica fume and superplasticizer, apart from nanosilica, to
the concrete composition caused density reduction of the concrete (B5-B8, B11B14), by ca. 10–30 kg/m
3 , compared to density of concretes with nanosilica content
(B3, B9, B4 and B10). Only in case of the concrete containing the silica fume (B2)
reduction of its density by ca. 30 kg/m
3 was observed compared to density of the test
concrete (B1).