Flexural Behaviour and Durability of Self Compacting Concrete Mixed with SN-Based Corrosion Inhibitor

Abstract

The present study aimed to create a Self-Compacting Concrete (SCC) that possesses long-lasting properties and evaluate its fresh, mechanical, and durability properties by substituting 30% of the cement with class F fly ash. Furthermore, the performance of SCC that has been admixed with an SN-based corrosion inhibitor was investigated. Various factors such as the ratio of water to powder, fine aggregate, coarse aggregate (12mm downgraded), and the SN-based corrosion inhibitor were studied. The particle size distribution of the materials was analyzed using a sieve to achieve an even distribution of sizes, appropriate packing, and a lower void content. Multiple mixes were conducted, each with a unique combination of fine and coarse aggregate, as well as a water-to-powder ratio that was altered to optimize the mix percentage. Finally, controlled SCC (or mix M2) met the fresh property standards outlined in the EFNARC guidelines and specifications.
The mechanical and durability properties of control SCC and SCC admixed with an SN-based corrosion inhibitor were investigated. Results showed a significant improvement in the compressive strength, split tensile strength, and flexural behavior of Reinforced Cement Concrete (RCC) beams when control SCC was utilized. Furthermore, the SCC with 2% SN demonstrated superior performance in terms of chloride penetration compared to the control SCC. The flexural strength parameters of the SCC with 2% SN were comparable to those of the control SCC. Based on the study's findings, it can be concluded that the addition of inhibitors at a weight percentage of 2% of the cement supplied increased durability properties without affecting the strength properties of SCC. Therefore, the created durable SCC can be recommended for applications such as bridges, prefabricated constructions, and deck slabs which are densely crowded with steel rebars. The study's findings could contribute to the development of SCC with enhanced properties, which would lead to more durable and sustainable construction materials.