## 3 Results and Discussion  
### Properties of Fresh Concrete  
The properties in the fresh state of the different mixes of SCC appear in Table 6. The mixes that incorporate diabase coarse and limestone filler or slag filler have an average slump flow of 750-850 mm corresponding to the upper category or SF3 according to EN 206-9, equivalent to category AC-E3 according to EFNARC. In the case of using slag coarse or diabase aggregates with fly ash, the average slump flow is reduced to 650-750 mm, corresponding to category SF2 according to EN 206-9 or AC-E2 according to EFNARC, ideal workability for conventional applications as pillars and walls. The use of slags as coarse aggregate penalizes slump flow by 10%, which is compatible with the results obtained in conventional concretes, where the use of slags leads to a general decrease in workability [29; 30]. The decrease in the flowability of concrete with slags is due to their increased friction, as well as their angular geometry and their high density. The t\({}_{500}\) for the SCC-DC-FA and SCC-DC-CS mixes are classified as VS2 according to EN 206-9 and AC-V1 according to the EFNARC, with values at the limit of the recommendations. On the other hand, the mixes with limestone filler and slag coarse fall outside the categories proposed by the recommendations, the latter due to the viscosity of the paste itself, since a greater amount of fines is used. The slump test of the SCC-SC-CS mix can be seen in the following link: [[https://www.youtube.com/watch?v=rZUtHjiP4](https://www.youtube.com/watch?v=rZUtHjiP4) dw]([https://www.youtube.com/watch?v=rZUtHjiP4](https://www.youtube.com/watch?v=rZUtHjiP4) dw). The flowability is at odds with viscosity, incorporating high-density aggregates requires a viscous paste (high fine content and low w/c ratio) that prevents the segregation of aggregates. Increasing viscosity also means obtaining a higher volume of occluded air or a poorer surface finish, which is why it is important to establish a compromise between both variables. In Figure 2, the correct distribution of aggregates in all mixes can be observed. In the case of SCC-DC-LF, areas with higher aggregate concentration and a mortar band of about 10 mm thick and slight bleeding are observed on the perimeter of the disk. The behavior of the SCC-DC-FA is more stable, favored by the shape of the fly ash particles that provide greater homogeneity in slump. Although it also has a mortar band about 10 mm thick, no bleeding is reported. In the case of SCC-DC-CS there is a homogeneous distribution of aggregates but a decrease in the viscosity of the paste and consequently greater bleeding and exudation due to incorporating the vitreous powder. The disk of the SCC-SC-CS shows a very homogeneous, symmetrical, and stable distribution. There is no segregation or concentration of coarse aggregates despite the high density of slags although there is a mortar band of about 10 mm around the disk. \begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multirow{2}{*}{**Concrete**} & \multirow{2}{*}{**V Funnel Test [s]**} & \multirow{2}{*}{**L-Box Test [\%]**} & \multicolumn{4}{c}{**Slump Flow Test**} \\ \cline{4-6}  & & & **D\({}_{\textbf{1}}\) [mm]** & **D\({}_{\textbf{2}}\) [mm]** & **t\({}_{\textbf{500}}\) [s]** \\ \hline SCC-DC-LF & 80 & 0.89 & 740 & 770 & 9 \\ SCC-DC-FA & 46 & 0.84 & 740 & 730 & 7 \\ SCC-DC-CS & 89 & 0.91 & 760 & 780 & 8 \\ SCC-SC-CS & 136 & 0.80 & 690 & 680 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Rheological properties of the self-compacting concrete in fresh state. Figure 2: Slump disks detail of all mixes. The values obtained from PL are consistent with the slump measured. The results of the L-box test (Table 6) show a passing capacity (PL) greater than 0.8 in all cases, which allows the mixes to be classified as PL1 according to EN 206-9 and as AC-RB2 according to EFNARC.