Conference, Proceedings

Table 3: Basic material parameters of SCC after 28 days
Material ρ [kgm ‐3 ] ρmat [kgm ‐3 ] Ψ [%]
SCC‐3 2410 2720 11
SCC‐4 2320 2560 9.6
Water vapor transport properties
The water vapor transport parameters of the studied SCC are shown in Table 4. The measured
data revealed basic information that the values of water vapor diffusion coefficient
corresponding to the lower values of relative humidity (5‐50%) were always lower than those
for higher relative humidity values (97‐50%). This is in accordance with the previous
measurements on many other materials including concrete. The main reason for this finding is
coupling of water vapor transport with water transport in a material with higher relative
humidity where the capillary condensation takes place in a much higher extent than in the
range of lower relative humidity [10].
The values of water vapor diffusion coefficient of SCC‐3 were about 35% (wet cup) and about
60% (dry cup) higher than for SCC‐4. This is in a qualitative agreement with the open porosity
data in Table 3 as it is quite obvious that a material with higher porosity should transport water
vapor faster than a material with lower porosity.
Table 4: Water vapor transport properties of SCC after 28 days
Material 97‐50%
D [10 ‐6 m 2 s ‐1 ] μ [‐]
RH
50‐5%
RH
97‐50%
RH
50‐5%
RH
SCC‐3 1.53 0.97 15.1 24.5
SCC‐4 1.13 0.58 20.3 39.6
Water transport properties
The results of liquid water transport parameters measurement in Table 5 show that the material
SCC‐3 with higher porosity transported liquid water in a much faster way than the material
SCC‐4. Its water absorption coefficient was by about 35% higher and the moisture diffusivity
about 50% higher compared to SCC‐ 4. Once again, it was a consequence of the secondary
pozzolanic reaction in the analyzed SCC resulting in structure compaction.
Table 5: Water transport properties of SCC after 28 days
Material A [kg m ‐2 s ‐1/2 ] κapp [m 2 s ‐1 ]
SCC‐3 0.0074 4.4E‐09
SCC‐4 0.0055 2.9E‐09
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