Hello,
This would be a good application for SPG. You could model the concrete with SPG particles. See *SECTION_SOLID_SPG in the user manual for more information. We have a model with concrete modelled as SPG and *MAT_CONCRETE_DAMAGE_REL3 was used. You will find SPG examples here:
https://www.lstc-cmmg.org/drilling
https://www.lstc-cmmg.org/spr
You can download the model by clicking on the [in]:

Reno.