The Durability of Concrete with the Participation …
119
In the paper the research was undertaken in order to determine the impact of
hydrophilic nanosilica used in a form of aqueous colloidal solution with admixture of nano-silver, as well as hydrophobic nanosilica dissolved in ethanol and
isopropanol on properties of the concrete without and with presence of silica fume
and polycarboxylate based superplasticizer.
2 Experimental Part
2.1 Material
Composition of designed concretes is given in Table 1.
Tests were conducted for concrete mixture and hardened concretes of Portland cement—CEM I 42, 5R with and withput the water solution of hydrophilic
nanosilica colloid with the admixture of nano-silver and hydrophobic nanosilica
colloid dissolved in ethanol and isopropanol. For mixture and hardened concrete
without participation of silica fume, Portland cement 42.5 R was used in an amount
of 549.7 kg/m
3 for obtaining BWW high-quality concretes. Nano-additives were
used in the amount of 0.5 and 1.5% in relation to the mass of cement. The silica
fume was additionally added to concretes in the amount of 8% by mass. While as
a chemical admixture in the amount of 2% in relation to the cement mass, a 40%
solution of a superplasticizer based on a polycarboxylic ether (SP) was used. Pebble
aggregate consisting of two fractions with a grain size of 2–8 and 8–16 mm was used
and sand with a grain size of 2 mm.
2.2 Test Methods
Tests included determination of concrete mixtures properties in scope of: consistency: slump test according to PN-EN 12350-2:2011 and Vebe test according to
PN-EN 12350-3:2011; density according to PN-EN12350-6:2011; air content by the
water column method according to PN-EN 12350-7:2011. Whereas tests of hardened concretes were conducted to determine: compressive strength after 1, 7, 14 and
28 days of curing according to PN-EN 12390-3:200, density according to PN-EN
12390-7:2001; depth of penetration of water under pressure according to PN-EN
12390-8:2001; water absorption according to PN-B-06250:1988 and frost resistance
according to PN-B-06250:1988, determined after 28-day curing of concretes.
Properties of fresh concrete and hardened concrete were tested in the accredited Construction Material Laboratory of the Faculty of Civil Engineering and
Architecture at the Opole University of Technology.
119
In the paper the research was undertaken in order to determine the impact of
hydrophilic nanosilica used in a form of aqueous colloidal solution with admixture of nano-silver, as well as hydrophobic nanosilica dissolved in ethanol and
isopropanol on properties of the concrete without and with presence of silica fume
and polycarboxylate based superplasticizer.
2 Experimental Part
2.1 Material
Composition of designed concretes is given in Table 1.
Tests were conducted for concrete mixture and hardened concretes of Portland cement—CEM I 42, 5R with and withput the water solution of hydrophilic
nanosilica colloid with the admixture of nano-silver and hydrophobic nanosilica
colloid dissolved in ethanol and isopropanol. For mixture and hardened concrete
without participation of silica fume, Portland cement 42.5 R was used in an amount
of 549.7 kg/m
3 for obtaining BWW high-quality concretes. Nano-additives were
used in the amount of 0.5 and 1.5% in relation to the mass of cement. The silica
fume was additionally added to concretes in the amount of 8% by mass. While as
a chemical admixture in the amount of 2% in relation to the cement mass, a 40%
solution of a superplasticizer based on a polycarboxylic ether (SP) was used. Pebble
aggregate consisting of two fractions with a grain size of 2–8 and 8–16 mm was used
and sand with a grain size of 2 mm.
2.2 Test Methods
Tests included determination of concrete mixtures properties in scope of: consistency: slump test according to PN-EN 12350-2:2011 and Vebe test according to
PN-EN 12350-3:2011; density according to PN-EN12350-6:2011; air content by the
water column method according to PN-EN 12350-7:2011. Whereas tests of hardened concretes were conducted to determine: compressive strength after 1, 7, 14 and
28 days of curing according to PN-EN 12390-3:200, density according to PN-EN
12390-7:2001; depth of penetration of water under pressure according to PN-EN
12390-8:2001; water absorption according to PN-B-06250:1988 and frost resistance
according to PN-B-06250:1988, determined after 28-day curing of concretes.
Properties of fresh concrete and hardened concrete were tested in the accredited Construction Material Laboratory of the Faculty of Civil Engineering and
Architecture at the Opole University of Technology.