# Long-Term Monitoring of the Behavior of Modified Bitunens of RC Type
## 6 Asphalt Mixture Designs and Test Sections  
Three asphalt mixtures of the asphalt concrete type were designed to create the experimental sections. The first one was designed for a wearing course (AC surf) and had an aggregate grain size of up to 11 mm (Domasov section). The second and third asphalt mixtures were intended for the binder course (AC bin) and contained aggregates with a grain size of up to 22 mm. The properties of the RAPs used in the test sections are shown in Table 5. The gradations of these asphalt mixtures are shown in Table 6.  
The virgin aggregate for the asphalt mixtures for the test section (Domasov and Lechnice) was greywacke with LA = 17% and SI = 19%. This aggregate was used for all fractions (0/4, 4/8, 8/11, 8/16 and 16/22) except filler. As filler, limestone was added.  
\begin{table}
\begin{tabular}{c c c c} \hline
**Test Section** & **Domasov** & **Lechnice** & **Opava** \\ \hline Asphalt mixture & AC surf 11+ & AC bin 22 S & AC bin 22 S \\ RAP fraction [mm] & 0/11 & 0/22 & 0/22 \\ Sieve size [mm] & & Passing percent [\%] & \\ \hline
32 & 100 & 100 & 100 \\
22 & 100 & 96 & 99 \\
16 & 100 & 92 & 97 \\
11 & 95 & 84 & 90 \\
8 & 82 & 73 & 78 \\
4 & 62 & 55 & 59 \\
2 & 46 & 39 & 44 \\
1 & 35 & 29 & 33 \\
0.5 & 26 & 21 & 25 \\
0.25 & 19 & 12 & 18 \\
0.125 & 15 & 10 & 14 \\
0.063 & 12.2 & 8.5 & 11.3 \\ \hline Binder content [\%] & 6.1 & 4.3 & 4.9 \\ Penetration [0.1 mm] & 16 & 21 & 27 \\ Softening point [\({}^{\circ}\)C] & 71.0 & 67.8 & 60.2 \\ \hline \end{tabular}
\end{table}
Table 5: Sieve curves and parameters of RAPs used at the test sections.  
The above-mentioned mixtures were used on experimental sections in the Czech Republic in 2015 and 2019. On these sections, polymer-modified bitumen PmB 45/80 RC was used as a fresh binder. Table 7 provides information on the construction site (location and type of asphalt mixture), RAP content, binder content (added, RAP and total) and the air void content of the pavement layer containing PmB RC.  
The test sections include two different types of asphalt mixtures with RAP contents of 18%, 23% and 39%. RAP was added cold in the case of the first two sections. In the third section, RAP was added preheated in a parallel drum. All test sections were continuously monitored. At the same time, cores were taken at regular intervals, followed by an analysis of the obtained binder.  
In Domasov, 1.45 km of the pavement was milled (40 mm) and resurfaced with a 7 m wide new pavement layer using 18% RAP. The AC surf 11+ wearing course had a total binder content of approximately 6.0% and a fresh binder content of 4.9% (PmB RC). A total of 45.5 t of the above-mentioned PmB RC was used for an area of 10,150 m\({}^{2}\).  
In Lednice, 0.6 km of the pavement was milled on 6 m width. The wearing course (40 mm) and binder course (60 mm) of the existing pavement were removed and laid again. The proportion of RAP was 23% and it was added cold to the asphalt mixture for the binder course. The AC bin 22 S had a total binder content of 4.3%, and a fresh binder content of 3.3% (PmB RC) thereof.  
On the new-built experimental section in Opava, the AC bin 22 S binder layer was laid with a total thickness of 60 mm. The proportion of RAP was 39% and it was added preheated in the parallel drum to the asphalt mixture for the binder course. The total binder content was 4.4% with a fresh binder content of 2.5% (PmB RC).