*Proceeding Paper* **The Impact of Waste Fluid Catalytic Cracking Catalyst Addition on the Selected Properties of Cement Pastes †**

**Paweł Niewiadomski 1,\* and Michał Cisi ´nski <sup>2</sup>**


**Abstract:** The significant reduction in CO2 emissions arising from the cementitious composites industry is one of the highest priorities for the construction sector's movement towards climate neutrality and sustainable development. One of the approaches to cope with this issue is to partially substitute cement with supplementary cementitious materials. Recently, various oil refinery wastes (ORW) have attracted researchers' attention in terms of being investigated for such an application. As such, the present paper shows the preliminary results of investigations conducted on cement pastes with the addition of a spent fluid catalytic cracking catalyst derived from a Polish oil refinery company. It is worth mentioning that the incorporation of ORW in cementitious composites might enable the production of more environmentally friendly construction materials without sacrificing quality, whilst, simultaneously providing an opportunity for recycling petrochemical wastes.

**Keywords:** oil refinery wastes; spent FCC catalyst; cementitious composites; cement pastes; supplementary cementitious materials; sustainable development

**Citation:** Niewiadomski, P.; Cisi ´nski, M. The Impact of Waste Fluid Catalytic Cracking Catalyst Addition on the Selected Properties of Cement Pastes. *Mater. Proc.* **2023**, *13*, 10. https://doi.org/10.3390/ materproc2023013010

Academic Editors: Katarzyna Mróz, Tomasz Tracz, Tomasz Zdeb and Izabela Hager

Published: 14 February 2023

**Copyright:** © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
