**6.3 Indirect Brazilian tensile test**

This test is an indicator of soil tensile strength. The samples were made in a standard mold with different dosages of an additive, according to **Table 2**. The age of 46 days was selected to compare the latest uniaxial compressive test time. **Figure 6** shows the sample with 0.15 lit/m<sup>3</sup> in the Brazilian Indirect Tensile Test device before failure.

**Figure 4.** *The mold of maximum compaction test.*

### **Figure 5.**

*a) sample with 0.15 lit/m<sup>3</sup> additive tested in 7 days of age and b) sample with 0.21 lit/m3 additive tested in 28 days of age.*

**Figure 6.** *The sample with 0.15 lit/m3 additive in Indirect Brazilian Tensile Test device.*

## **6.4 Direct shear test**

As the additive affects surface energy of colloids, shear parameters need to investigate. Based on the manufacturer's statements about the possibility of loading the route and releasing traffic immediately after construction, the shear test age was conducted on the day after sample preparation (**Figure 7**) [37].

## **6.5 Uniaxial cyclic test**

A series of dynamic tests were carried out to investigate proposed track properties. Each track component has a specific role, and the performance depends on its type

*Developing a Novel Superstructure System for the Ballasted Railways Using RRP235special... DOI: http://dx.doi.org/10.5772/intechopen.111470*

**Figure 7.** *Direct shear test device.*

and geometry. Any change in the specification of a component leads different reaction. The important factors of track under dynamic loads were investigated using the Ballast box test. The Ballast box device simulates applied forces from rolling stock to track.
