摘要：The article presents the results of studies on sorption performed
on three samples of mortars with similar density of about 2,000 kg/m3
.
The tested mortars differed in their water-to-cement ratio. Three levels of
w/c ratio were adopted that were respectively: 0.5; 0.55 and 0.6. The prepared
mortars were cut into samples with a thickness of 1 cm, dried to constant
weight at a temperature of 105°C and insulated on the side surface with
silicone. The experiment was carried out at a temperature of 25°C and at six
different levels of relative humidity ϕ ≈ 12, 33, 54, 76, 85, 98%. Relative
humidity was provided by saturated solutions of the appropriate salts: LiCl
(ϕ ≈ 12%), MgCl2 (ϕ ≈ 33%), Mg(NO3)2 (ϕ ≈ 53%), NaCl (ϕ ≈ 76%), KCl
(ϕ ≈ 85%), K2SO4 (ϕ ≈ 98%). The adopted level of temperature and range
of relative humidity meet the hygrothermal conditions which tend to affect
the cement mortar in real life. The long-term measurement results were
used to assess the behaviour of the tested mortars under various conditions
of moisture and to determine the equilibrium sorptive humidity.
其他摘要：The article presents the results of studies on sorption performed on three samples of mortars with similar density of about 2,000 kg/m3. The tested mortars differed in their water-to-cement ratio. Three levels of w/c ratio were adopted that were respectively: 0.5; 0.55 and 0.6. The prepared mortars were cut into samples with a thickness of 1 cm, dried to constant weight at a temperature of 105°C and insulated on the side surface with silicone. The experiment was carried out at a temperature of 25°C and at six different levels of relative humidity φ ≈ 12, 33, 54, 76, 85, 98%. Relative humidity was provided by saturated solutions of the appropriate salts: LiCl (φ ≈ 12%), MgCl2 (φ ≈ 33%), Mg(NO3)2 (φ ≈ 53%), NaCl (φ ≈ 76%), KCl (φ ≈ 85%), K2SO4 (φ ≈ 98%). The adopted level of temperature and range of relative humidity meet the hygrothermal conditions which tend to affect the cement mortar in real life. The long-term measurement results were used to assess the behaviour of the tested mortars under various conditions of moisture and to determine the equilibrium sorptive humidity.
