*2.1. The Initial Concrete Rubble*

The recycled cement mortar (RCM) was obtained from 2-year-old laboratory cube specimens 100 × 100 × 100 mm due to the recycling process according to PAT 229887 [28]. The composition of the initial concrete mix is presented in Table 1. The concrete was classified as C30/37 strength class.


**Table 1.** The composition of the initial concrete mix on 1 m3.
