## Materials and Testing
### Tests and Criteria  
The mineral-cement mixture with foamed bitumen (MCAS) should have adequate physical and mechanical parameters. The following parameters were used for the evaluation of the MCAS:  
* air void content (V\({}_{\rm m}\)) to EN 12697-8 [19],
* water absorption (N\({}_{\rm w}\)),
* density \(\rho_{\rm SSD}\) to EN 12697-6 [20],
* indirect tensile strength (ITS) to EN 12697-23 [21] and to [22],
* dynamic modulus E\({}^{\bullet}\) (DTC-CY) to EN 12697-26 D [23],
* resistance to moisture damage (TSR) to AASHTO T283 [24],
* resistance to moisture damage (\(W_{\rm RW\cdot 2M}\)) after two freezing cycles (modified method) on the basis of conclusions in [25; 26]  
Cylindrical specimens for testing the dynamic stiffness modulus were prepared using a gyratory compactor in accordance with EN 12697-31 [27]. The dimensions of the specimens had to meet the H(height)/D(diameter) > 1.8 requirement. The parameters of the gyratory press were set based on the review of the literature [28; 29]. The density of the gyratory specimens had to be approximately the same as that of the specimens compacted using the modified method indicated in [11; 12]. The modification involved static loading of the specimen with a force of 80 kN for 180 s. The number of  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Mixture** & **Type 1 (D/P/A)** & **Type 2 (B/P/A)** & \begin{tabular}{c} **Type 3** (RAP/SG)** \\ \end{tabular} & \begin{tabular}{c} **Type 4** (RAP/VA)** \\ \end{tabular} & \
\begin{tabular}{c} **Type 5** (RC/VA)** \\ \end{tabular} &
\begin{tabular}{c} **Type 6** (RA/VA)** \\ \end{tabular} \\ \hline Amount of foam & \(1.2\%\); \(2.4\%\); \(3.6\%\) & \(1.2\%\); \(2.4\%\); \(3.6\%\) & \(2.5\%\) & \(2.5\%\) & \(2.5\%\) & \(2.5\%\) \\ \hline Amount of cement (C) & \(2.0\%\) & \(2.0\%\) & \(2.0\%\) & \(2.0\%\) & \(2.0\%\) & \(2.0\%\) \\ \hline Amount of additional dust (P) & \(5\%\) \(12.5\%\) & \(20\%\) & \(5\%\); \(12.5\%\); \(20\%\) & & & \\  & Dolomite (D) & Basalt (B) & - & - & - & - \\ \hline Amount of steel slag (SG) & - & - & \(50\%\) & - & - & - \\ \hline Amount of virgin & & & & & & \\ dolomite aggregate (VA) & - & - & - & \(80\%\); \(60\%\); \(50\%\) & \(80\%\); \(60\%\) & \\ \hline Amount of RAP (RAP) & - & - & \(50\%\) & \(20\%\); \(40\%\); \(50\%\) & \(20\%\); \(40\%\); \(60\%\); \(80\%\) & - \\ \hline Amount of recycled aggregate (RA) & - & - & - & - & - & \(20\%\); \(80\%\) \\ \hline \hline \end{tabular}
\end{table}
Table 1: Mineral–cement mixture with foamed bitumen (MCAS) recycled mixture types with waste materials.  
test specimens depended on the provisions of the standards according to which the tests were carried out. Nevertheless, after removing outliers, at least three specimens had to be used.  
The number of freezing cycles for determining the resistance to moisture damage (W\({}_{\text{RW-2M}}\)) was established from the findings that the stiffness modulus reduced noticeably after 2 freezing cycles [16]. This test was performed to supplement the TSR test. The dynamic stiffness modulus (E\({}^{\bullet}\)) was determined in the DTC-CY test to extend the analysis of classical results over the rheological properties of the recycled mixtures with waste materials, conducted at various temperatures and loading times. A possibility of applying sinusoidal load helped determine the phase angle (\(\delta\)). The load was applied at frequencies: 0.1 Hz, 0.3 Hz, 1 Hz, 3 Hz, 10 Hz and 20 Hz. Test temperatures used were as follows: \(-7\)\({}^{\circ}\)C, \(5\)\({}^{\circ}\)C, \(13\)\({}^{\circ}\)C, \(25\)\({}^{\circ}\)C and \(40\)\({}^{\circ}\)C. To comply with [22; 30], where the stiffness of the recycled mixtures has to be evaluated in the IT-CY, the stiffness modulus was also determined using the DTC-CY method at a temperature of 5 \({}^{\circ}\)C and frequency of 10 Hz. All the requirements set forth in [22] and those concerning ITS [31] are represented in diagrams with respect to the clusters obtained.