# Properties and Preparation of a New High-Permeability Emulsified Asphalt and Its Modification
## 5 Conclusions  
In this study, a new high-permeability emulsified asphalt with good stability and bonding effect was prepared and modified. The properties of high-permeability emulsified asphalt and its modification were studied. The main conclusions can be drawn as follows:  
(1) The optimal dosage of the high-permeability emulsified asphalt can be recommended as 55.2% diluted asphalt (44.16% matrix asphalt + 11.04% diluent) + 40% emulsion (2% emulsifier + 0.5% stabilizer + 1% osmotic agent + 1% op-10 + 35.5% water) + 4.8% aromatic oil. This high-permeability emulsified asphalt can be prepared with good stability and permeability.  
(2) The adhesion of the modified high-permeability emulsified asphalt is greatly improved, and the tensile strength and shear strength of the modified high-permeability emulsified asphalt are about two times higher than that of the high-permeability emulsified  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Type of Permeable Material** & **Permeability Coefficient** & **Analysis of Water Seepage Phenomena** \\ \hline Nothing & 545 mL/min & Severe water penetration \\ \hline Traditional emulsified asphalt & 20 mL/min & A little water runs around the face plate, almost no water seepage at the bottom \\ \hline High-permeability emulsified asphalt & 12 mL/min & A small amount of water runs out of the face plate and bottom \\ \hline Modified high-permeability emulsified asphalt & 8 mL/min & Almost no water penetration \\ \hline \hline \end{tabular}
\end{table}
Table 15: Analysis of water penetration test results for different permeable layer materials.  
asphalt, which meets the requirements of the specification, and the interlayer shear, stability, and waterproof performance are good. In general, modified high-permeability emulsified asphalt is the best surface material.  
(3) The amount of spraying and the curing age of the base has a significant influence on the penetration depth of the prime coat material on the base. The best spraying time of the prime coat material prepared in this paper is between 10 h and 24 h after the compaction of the base. The optimal spraying amount of ordinary emulsified asphalt and modified high-permeability emulsified asphalt on a cement-stabilized macadam base is 1.1 L/m\({}^{2}\), and that of high-permeability emulsified asphalt is 1.3 L/m\({}^{2}\).  
(4) Based on the analysis of permeability, cohesiveness, and waterproof performance, the modified high-permeability emulsified asphalt are the prime coat materials with the best performance.  
Conceptualization, J.X.; methodology, Y.T.; software, Y.T.; validation, X.Z. and Y.C.; formal analysis, J.X.; investigation, X.Z.; resources, Y.T.; data curation, Y.C.; writing--original draft preparation, J.X.; writing--review and editing, J.X.; visualization, Y.T.; supervision, X.Z.; project administration, Y.C.; funding acquisition, X.Z. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Project of Science and Technology of Henan Transportation Department, grant number 2021-2-13. At the same time, this research was also funded by the Key Science and Technology Project of Henan Province, grant number 212102310937.  
Not applicable.  
Details on all data supporting the reported results can be obtained in Tables 1-6 and Figures 1-8 of this original manuscript.  
The authors declare no conflict of interest.