Comparative Analysis of Chloride Penetration in Sustainable Quaternary Blended SCC with and Without Polypropylene Fiber Reinforcement

This study focuses on the development of an economical Self-Compacting Concrete (SCC) that maintains its characteristic ability to flow under its own weight, fully occupying formwork without the need for vibrational compaction. The research aims to reduce waste and carbon emissions associated with cement production by optimizing the use of supplementary materials. Specifically, the study explores the effects of varying concentrations of fly ash and ground granulated blast furnace slag (GGBS), the substitution of 10% of cement with silica fume, and the inclusion of 0.2% polypropylene fiber (PPF) on SCC properties. Eight concrete mixes were evaluated: four incorporating PPF and four without. The results provide insights into the performance and environmental benefits of these modified SCC formulations. Also the study investigates the chloride penetration characteristics of Sustainable Quaternary Blended Self- Compacting Concrete (QBSCC) with and without polypropylene fiber reinforcement. Various QBSCC mixes were formulated by replacing Ordinary Portland Cement (OPC) with combinations of supplementary cementitious materials (SCMs) including silica fume (SF), fly ash (FA), and ground granulated blast furnace slag (GGBS). The Rapid Chloride Penetration Test (RCPT) was conducted at 28 and 56 days to assess chloride ion permeability. Results indicate that QBSCC mixes incorporating SCMs exhibit significantly lower chloride permeability compared to the control mix (MIX-1) composed of 100% OPC. MIX-4, containing 50% OPC, 10% SF, 10% FA, and 30% GGBS, shows the most promising performance with the lowest passed charges, suggesting enhanced durability against chloride ion penetration. Addition of 0.2% polypropylene fibers further enhanced chloride resistance, especially in the mix with the highest resistance to chloride penetration. Overall, the study concluded that QBSCC formulations with optimized SCM content and polypropylene fiber reinforcement have superior durability and reduced chloride permeability, making them suitable for construction in aggressive environments where chloride exposure is a concern.