## 4 Conclusions  
This work proposed a new mix design procedure for microsurfacing mixtures, which was used to assess the influence of the type and amount of asphalt emulsion and the added water and cement contents on the characteristics of the mixture. The study started with materials characterization, which provided valuable insights to help elucidate the mixtures' behavior in the following tests. The basalt aggregates demonstrated better compatibility with Emulsion 1 than Emulsion 2, suggesting that Emulsion 1 may be more suitable for optimal performance. Emulsion 1 also exhibited higher adhesion and cohesion results than Emulsion 2, meeting the relevant standards. Regarding rheological properties, Emulsion 1 displayed higher viscosity at lower temperatures, while Emulsion 2 showed less susceptibility to temperature changes. Additionally, Emulsion 1 had higher stiffness at lower temperatures, whereas Emulsion 2 showed higher stiffness at higher temperatures, likely due to different polymer contents. The phase angle results indicated that Emulsion 1 had lower modification levels than Emulsion 2, affecting its resistance to permanent deformation at high temperatures. After the materials characterization, two mixtures were produced with emulsions C65 BP4 (Emulsion 1) and C60 BP4 (Emulsion 2). A sequence for adding each material was proposed to standardize the procedure of mixture production since these indications are missing in the European standards and significantly influence the mixture's workability. Furthermore, two preliminary tests were suggested to determine the mixture's initial amount of cement and added water: the pizza and ball tests. This work showed that the pizza and ball tests had good capability in evaluating the effects of water and cement on the material's behavior. These tests save time for the subsequent mix design by quickly approximating the values of water and cement needed for adequate performance. The consistency test can be used to confirm the amount of added water and the workability of the mixture. In this work, the amount of water determined in the pizza and ball tests was confirmed for the microsurfacing mixture with Emulsion 1, while the mixture with Emulsion 2 required a reduction of 1% in the water content to obtain the expected workability. The cohesion test was the most time-consuming phase of the mix design procedure, as it is necessary to identify the best relationship between the amount of asphalt emulsion, added water, and cement until a higher cohesion value is found. The cohesion results of this test were generally higher for Emulsion 1, resulting in a quick-set quick-traffic system for that emulsion and a quick-set slow-traffic system for Emulsion 2. Moreover, the ultimate cohesion values observed after 120 min were higher than 20 kgf cm and similar for both emulsions, showing that the mix design method proposed in the present work could adequately select the mix compositions for different types of emulsions. The mixture produced with Emulsion 2 presented better results than those obtained with Emulsion 1 in the shaking abrasion test, which may be related to this emulsion's \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Emulsion** & **Sample** & **Vv** & **Water Absorption** & **Abrasion** \\  & & **(cm\({}^{3}\))** & **(\%)** & **(\%)** \\ \hline \multirow{4}{*}{Emulsion 1} & 1 & 18.2 & 13.59 & 1.95 \\  & 2 & 18.0 & 13.26 & 1.97 \\  & 3 & 18.0 & 12.71 & 2.21 \\  & 4 & 17.8 & 13.48 & 2.49 \\ \cline{2-5}  & Mean & 18.0 & 13.26 & 2.15 \\ \hline \multirow{4}{*}{Emulsion 2} & 1 & 17.9 & 12.22 & 0.74 \\  & 2 & 17.3 & 12.07 & 0.51 \\ \cline{1-1}  & 3 & 17.9 & 11.11 & 0.49 \\ \cline{1-1}  & 4 & 17.9 & 11.73 & 0.74 \\ \cline{1-1} \cline{2-5}  & Mean & 17.8 & 11.78 & 0.62 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Abrasion results for the microsurfacing asphalt mixtures produced with both emulsions studied in this work. potential higher polymer modification, as inferred from its residual binder's higher elastic recovery and softening point temperature.