Conference, Proceedings

Thermal properties
The thermal parameters data in Table 6 show that both materials achieved similar values of
thermal conductivity in the whole range of moisture content. This was not in a good agreement
with the open porosity data in Table 3 as in general a material with higher porosity should have
lower thermal conductivity. However, the differences between both materials were relatively
low, within the error range of the measuring method. Also, the lowering of matrix density after
1‐year as compared to the 28‐days results indicated a possible change in the composition of the
porous matrix, the lowering of the open porosity then a change in the topology of the pore
space which could be manifested in somewhat different way of mixing the basic phases into the
resulting thermal conductivity values.
The differences in specific heat capacity of both materials were in the whole moisture range
relatively low, up to 10%, which was well within the error range of the measurement method.
Conclusions
198
Type of mixture
Table 6: Thermal properties of SCC after 28 days
u λ c
[% kg‐water/kg‐
dry material] [Wm ‐1 K ‐1 ] [Jkg ‐1 K ‐1 ]
SCC‐3 0.0 2.84 716
SCC‐3 2.1 3.27 728
SCC‐3 3.8 3.42 725
SCC‐3 4.4 4.17 733
SCC‐4 0.0 2.79 639
SCC‐4 1.8 3.45 764
SCC‐4 3.4 3.70 766
SCC‐4 3.7 3.78 738
The results of measurement of basic physical parameters and the hygric and thermal properties
of SCC produced with cement containing blast furnace slag in this paper showed that the effect
of slag was positive in a long term view. Comparing the results obtained 28 days and 1 year
after mixing, the values of open porosity, water vapor diffusion coefficient and water
absorption coefficient were after 1‐year significantly lower than the corresponding 28‐days data.
This indicates an improvement of durability. The thermal conductivity and specific heat
capacity of the studied SCC were for both time periods almost the same, within the error range
of the experimental methods.
The obtained data can be considered as a step towards establishment of a material database for
SCC which is currently not available and which should serve for hydro‐thermo‐chemo‐
mechanical models, making it possible to perform complex durability and reliability based
studies of building constructions involving SCC in various applications.