## 5 Test Methods
### Testing the Water Sensitivity of Asphalt Samples  
Frequent damage to and the deterioration of asphalt pavements are caused by the action of water during road use. The water sensitivity of asphalt is manifested as a reduction in the connection between the bituminous binder and the aggregate under traffic loads, resulting in the degradation of the driving surface of the pavement.  
Table 6 shows the average dimensions and densities of the dry samples before conditioning, and Table 7 shows the average dimensions and densities of the water-saturated samples before vacuuming. After vacuuming the water-saturated samples, no changes in dimensions (height, diameter) were found, and there was no change in the volume or swelling of the asphalt samples.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Asphalt Sample**} & **Average Height (mm)** & **Average Diameter (mm)** & **Average Dry (g)** & **Average Sample Density (Mg/m\({}^{3}\))** \\ \hline Dry (four pieces) & & & & \\ With 50\% & 64.2 & 101.5 & 1232.2 & 2.412 \\ BA filler & & & & \\ \hline Dry (four pieces) & & & & \\ With 100\% & 64.5 & 101.4 & 1238.0 & 2.419 \\ mineral filler & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 6: Average dimensions and densities of dry samples before conditioning.  
\begin{table}
\begin{tabular}{c c} \hline \hline \multicolumn{1}{c}{**Characteristic**} & **Test Method** \\ \hline Concentration of hydrogen ions (pH) & HRN EN ISO 10523 [37] \\ \hline Fluorides & RU-MET-001 \\ \hline Sulfates & SM23 Ed2017, 4500 E \\ \hline Chlorides & HRN ISO 9297 [38] \\ \hline Phenolic index & HRN ISO 6439 [39] \\ \hline Content of the total dissolved solids (TDS) & HRN EN 15216 [40] \\ \hline Dissolved organic oxide (DOC) & HRN EN 1484 [41] \\ \hline Arsenic (As), Barium (Ba), Cadmium (Cd) & HRN EN ISO 17294-2 [42] \\ \hline Total chromium (Cr), Copper (Cu), Mercury (Hg) & HRN EN ISO 17294-2 \\ \hline Molybdenum (Mo), Nickel (Ni), Lead (Pb) & HRN EN ISO 17294-2 \\ \hline Antimony (Sb), Selenium (Se), Zinc (Zn) & HRN EN ISO 17294-2 \\ \hline \hline \end{tabular}
\end{table}
Table 5: Testing the eluate of a crushed asphalt sample and of a submerged asphalt sample (cylinder \(\mathcal{O}\)100 mm).  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Asphalt Sample**} & **Average Height (mm)** & **Average Diameter (mm)** & **Average Sample Mass (g)** & **Average Sample Density (Mg/m\({}^{3}\))** \\ \hline Wet (four pieces) & & & & \\ With 50\% & 63.2 & 101.5 & 1220.5 & 2.415 \\ BA filler & & & & \\ \hline Wet (four pieces) & & & & \\ With 100\% & 64.0 & 101.4 & 1237.2 & 2.419 \\ mineral filler & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 7: Average dimensions and densities of water-saturated samples before vacuuming.  
In accordance with HRN EN 12697-12 [43], four wet test samples were conditioned for 72 +/- 2 h at 40 \({}^{\circ}\)C +/- 2 \({}^{\circ}\)C in water; the other four dry test samples were conditioned for 72 +/- 2 h at 20 \({}^{\circ}\)C +/- 5 \({}^{\circ}\)C in air, and all eight asphalt samples were tested using method A at 15 \({}^{\circ}\)C.  
The sensitivity of the asphalt pavement layer to the action of water (ITSR) is expressed by the ratio of the indirect tensile strengths of the wet and dry asphalt samples.  
\[\text{ITSR}=\text{ITSw}/\text{ITSd} \tag{1}\]  
where  
ITSR = indirect tensile strength ratio (%);  
ITSw = indirect tensile strength of wet asphalt sample (kPa);  
ITSI = indirect tensile strength of dry asphalt sample (kPa).