## 3 Results and Discussions
### Conforning of Bituminous Mixtures and Tests  
Once the physical properties and chemical composition of the waste had been determined, as well as their suitability for conforming to bituminous mixtures, the different families of mixtures detailed in Table 2 proceeded to conform with increasing percentages of bitumen. The procedure for forming and compacting is the detailed in the methodology. The different families of bituminous mixtures were tested to determine their physical properties. Firstly, the bulk density was calculated, showing the results detailed in Figure 6.  
The bulk density is the density of the bituminous mix considering the volume of voids. Therefore, it can be seen that the HC family conformed with conventional materials has a lower bulk density than the SC and SS families. The latter families have very similar bulk densities, because only the filler employed varies. In turn, the maximum density is another of the essential physical properties for evaluating a bituminous mixture and obtaining the void content. The maximum density of the different families of mixtures with different percentages of bitumen is shown in Figure 7. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Element** & **LFS, mg/kg** & **EAFS, mg/kg** \\ \hline Ba & 12.784 & 2.132 \\ Cd & 0.000 & 0.000 \\ Cr & 0.007 & 0.237 \\ Mo & 0.092 & 0.078 \\ Ni & 0.002 & 0.004 \\ Pb & 0.018 & 0.006 \\ Se & 0.080 & 0.035 \\ V & 0.008 & 1.175 \\ Zn & 0.021 & 0.112 \\ As & 0.000 & 0.000 \\ Cu & 0.066 & 0.105 \\ Hg & 0.000 & 0.000 \\ Sb & 0.011 & 0.012 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Concentration of chemical elements in the leaching of ladle furnace slag and electric arc furnace slag. Figure 6: Bulk density of the HC, SC, and SS families of bituminous mixtures according to the percentage of bitumen. The maximum density is the density of the bituminous mix without consideration of the voids in the mix. Therefore, and since electric arc furnace slag has a higher density than hornfels aggregate, the SC and SS mix families have a higher maximum density than the HC family. In turn, it can be seen that the increase in the percentage of binder causes the maximum density for all families to decrease, a fact that can be expected by the low density of the bitumen. On the other side, the determination of the void content in the mix from the maximum density and the bulk density is essential. The void content is reflected in Figure 8 for all families of bituminous mixtures. The void content in the mix of the three families of bituminous mixtures is very similar, with small variations in the highest percentages of bitumen between the HC mix and the SC and SS mixes. However, these variations are negligible. It should be noted that the content of voids in the mix is one of the properties that most influences the quality of the bituminous mix, since it conditions its drainability, its roughness for the friction of  
Figure 8: Void content of the HC, SC, and SS families of bituminous mixtures as a percentage of bitumen. Figure 7: Maximum density of the HC, SC, and SS families of bituminous mixtures according to the percentage of bitumen. the tire with the pavement, and even the absorption of noise. The values obtained for all the families of bituminous mixtures are acceptable according to the detailed Spanish regulations and are usual in mixtures with discontinuous grading. The Marshall test was used to evaluate the resistance of the bituminous mixtures. This test evaluates whether the percentage of bitumen is inadequate, creating excessive plastic deformations due to an excess of bitumen, or low resistance due to insufficient bitumen. The Marshall results of the families of conformed mixtures are detailed in Figure 9.  
The Marshall test of the bituminous mix families showed that the SS family, composed of electric arc furnace slag as an aggregate and ladle furnace slag as a filler, had the best resistance.