**4. Conclusions**

The main aim of this research was to determine the mechanical and thermal behaviors of the proposed CGCB bricks. An additional purpose was to compare scaffolded and non-scaffolded test samples. Such an approach allowed for a deep analysis of the use of additional polymeric structures. The results revealed the positive physical properties (thermal and mechanical) of a new type of concrete with glass particles, additionally reinforced by an additively manufactured polymeric structure. The analyses conducted highlight the positive influence of using waste materials, such as glass particles or recycled PET-G. The combination of these two materials in building engineering solutions is also

possible. Based on the mixtures law, it could be additionally concluded that the addition of such kinds of waste materials increases the chemical resistance of the produced bricks. The results of this research allow us to draw the following conclusions:


To obtain more stable properties of the material, in different directions, it is necessary to use polymeric structures with proper cell dimensions—it is essential to allow the easy flow of the glass particles in the material's volume.

For further research, it is necessary to create a structure that could improve the mechanical properties of the produced bricks. Such a positive effect in this research (as more isotropic properties), could be improved by increasing the volume of the scaffolding material.

The novel cement-glass composite brick, made from approximately 86% of waste, is an example of the reuse of rubbish from other industries in the construction sector. It should be noted that the durability of the final CGCB is comparable to traditional bricks, while ensuring increased thermal insulation at the same time.

**Author Contributions:** Conceptualization, M.M. and J.K.; methodology, J.Ł., J.T., I.S. and W.Ł.; software, I.S. and M.J.; validation, M.M., K.G. and M.J.; formal analysis, J.K.; investigation, J.Ł., W.Ł., J.T., I.S. and J.K.; resources, J.K.; data curation, M.M., I.S. and J.Ł.; writing—original draft preparation, M.J., J.K. and W.Ł.; writing—review and editing, J.K. and M.M.; visualization, I.S. and J.Ł.; supervision, M.M. and J.K.; project administration, M.M.; funding acquisition, J.K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work and APC was financed by Military University of Technology under research project UGB 22 830. Additionally, a part of the research was funded by the Dean of the Faculty of Civil Engineering and Geodesy of the Military University of Technology as part of gran<sup>t</sup> no. UGB/813/2023.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data available on request.

**Conflicts of Interest:** The authors declare no conflict of interest.
