Mechanical Performance of Concrete Incorporating FluidizedCatalytic Cracking Residue from the Petrochemical Industry as aSupplementary Cementitious Material

- Authors: Dien Huu Nguyen
Affiliations:
Long An University of Economics and Industry, Khanh Hau W., Tay Ninh, Vietnam
- *Corresponding:This email address is being protected from spambots. You need JavaScript enabled to view it.
- Keywords: Concrete mechanics, RFCC waste, supplementary cementitious material, compressivestrength, flexural strength, sustainable construction.
- Received: 24th-Sept-2025
- Revised: 30th-Oct-2025
- Accepted: 2nd-Nov-2025
- Online: 31st-Dec-2025
- Section: Mineral Beneficiation and Processing
Abstract:
The increasing demand for sustainable construction materials has highlighted the need to reduce theenvironmental footprint of cement production. This study investigates the reuse of petrochemical residuefluidized catalytic cracking (RFCC) waste as a supplementary cementitious material (SCM) in concrete.RFCC was subjected to two activation methods: high-temperature treatment at 800, 1000, and 1200 °C,and mechanical grinding to enhance pozzolanic activity. Concrete mixtures were prepared with cementreplacement levels ranging from 10% to 50% by mass. Fresh properties, including workability and settingtime, and hardened mechanical properties such as compressive strength, flexural strength, and elasticmodulus, were evaluated at 28 days. Results show that RFCC reduces slump and shortens the settingtime of concrete mixtures. At 50% cement replacement, compressive and flexural strengths decreased byup to 45%. However, thermal activation at 1000–1200 °C significantly improved compressive and flexuralstrengths as well as elastic modulus by 10–20% compared to untreated RFCC. Ground RFCC showedlower early-age strength at 10% replacement but outperformed heat-treated RFCC at higher replacementlevels (20–50%). The findings demonstrate that properly treated RFCCwaste can replace up to 30% ofcement without compromising mechanical performance, offering a viable route for cost reduction, carbonemission mitigation, and sustainable concrete production.
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