The Durability of Concrete with the Participation …
121
whereas for the Vebe test according to PN-EN 12350-3:2011—the expanded
uncertainty of the measurement equal to ±1.5 s;
• testing of density according to PN-EN 12350-6:2011—taking into account the
expanded uncertainty of the measurement equal to 10 kg/m
3 ;
• testing of the air content with the water column method according to PN-EN
12350-7:2011—taking into account the expanded uncertainty of the measurement
equal to ±0.5%.
Testing of hardened concretes according to PN-EN 12390-3:200 was performed
on cubic test specimens with dimensions 100 × 100 × 100 mm. Obtained results
of compressive strength tests on test specimens of CEM I 42.5 R cement without
additives, as well as modified concretes with nanoadditives with and without silica
fume and plasticizer after 1, 7, 14 and 28 days of curing, taking into account the
expanded uncertainty of measurement equal to ±2.9 MPa. Then subsequently in
tests of density according. to PN-EN 12390-7:2001, the expanded uncertainty of
measurement taken into account was ±8.7 kg/m
3 , in tests of depth of penetration of
water under pressure according to PN-EN 12390-8:2001—the expanded uncertainty
was ±4 mm, and in tests of water absorptivity according to PN-B-06250:1988—
the expanded uncertainty was ±0.36%. Whereas in freeze-thaw resistance tests
according to PN-B-06250:1988—the expanded uncertainty equal to ±0.46%.
Pursuant to requirements of relevant standards, a number of test specimens in
individual tests depended on the testing method applied and it was respectively:
• for testing of consistence with the Vebe method according to PN-EN 123503:2011 and the slump test. PN-EN 12350-2:2011, according to PN-EN 123506:2011 and the air content in concrete with the water column method according.
to PN-EN 12350-7:2011 measurements were conducted for each concrete batch
mixed (MB) without and with modification of the composition with the content
of nanoadditives, silica fume and the superplasticizer introduced according to the
composition given in Table 1
• for compressive strength tests according to PN-EN 12390-3:2001 measurements
were performed on three test specimens of the same type of concrete, and the
result was averaged in line with guidelines set forth in the standard. Tests were
repeated twice.
• tests of concrete freeze-thaw resistance according. to PN-88/B-06250 were
performed for 12 test specimens of the same type of concrete, whereas 6 specimens
were subject to freeze-thaw tests, and remaining 6 to curing in standard conditions
in temperature 20 ± 2 °C), while treating them as witness specimens in line with
requirements of the standard applied. After a 28-day period, test specimens were
subject to the compressive strength testing.
121
whereas for the Vebe test according to PN-EN 12350-3:2011—the expanded
uncertainty of the measurement equal to ±1.5 s;
• testing of density according to PN-EN 12350-6:2011—taking into account the
expanded uncertainty of the measurement equal to 10 kg/m
3 ;
• testing of the air content with the water column method according to PN-EN
12350-7:2011—taking into account the expanded uncertainty of the measurement
equal to ±0.5%.
Testing of hardened concretes according to PN-EN 12390-3:200 was performed
on cubic test specimens with dimensions 100 × 100 × 100 mm. Obtained results
of compressive strength tests on test specimens of CEM I 42.5 R cement without
additives, as well as modified concretes with nanoadditives with and without silica
fume and plasticizer after 1, 7, 14 and 28 days of curing, taking into account the
expanded uncertainty of measurement equal to ±2.9 MPa. Then subsequently in
tests of density according. to PN-EN 12390-7:2001, the expanded uncertainty of
measurement taken into account was ±8.7 kg/m
3 , in tests of depth of penetration of
water under pressure according to PN-EN 12390-8:2001—the expanded uncertainty
was ±4 mm, and in tests of water absorptivity according to PN-B-06250:1988—
the expanded uncertainty was ±0.36%. Whereas in freeze-thaw resistance tests
according to PN-B-06250:1988—the expanded uncertainty equal to ±0.46%.
Pursuant to requirements of relevant standards, a number of test specimens in
individual tests depended on the testing method applied and it was respectively:
• for testing of consistence with the Vebe method according to PN-EN 123503:2011 and the slump test. PN-EN 12350-2:2011, according to PN-EN 123506:2011 and the air content in concrete with the water column method according.
to PN-EN 12350-7:2011 measurements were conducted for each concrete batch
mixed (MB) without and with modification of the composition with the content
of nanoadditives, silica fume and the superplasticizer introduced according to the
composition given in Table 1
• for compressive strength tests according to PN-EN 12390-3:2001 measurements
were performed on three test specimens of the same type of concrete, and the
result was averaged in line with guidelines set forth in the standard. Tests were
repeated twice.
• tests of concrete freeze-thaw resistance according. to PN-88/B-06250 were
performed for 12 test specimens of the same type of concrete, whereas 6 specimens
were subject to freeze-thaw tests, and remaining 6 to curing in standard conditions
in temperature 20 ± 2 °C), while treating them as witness specimens in line with
requirements of the standard applied. After a 28-day period, test specimens were
subject to the compressive strength testing.