*3.1. Basic Material Properties*

The basic characteristics of the material such as the bulk density, matrix density and the open porosity of the material calculated from them are shown in Table 3. There was no clear trend in the open porosity values of the different mixtures. The results were more or less similar for all measured mixtures and oscillated around the average value. The mixture labeled 80S+20R is slightly out of line, having the highest measured value of 19.82%. This is probably due to measurement uncertainty.

**Table 3.** Basic material properties of the mixtures.

