Lakshay Mhatre
Independent Researcher
India
Abstract
Self-compacting concrete (SCC) incorporating silica fume has emerged as a viable solution to achieve high-performance, sustainable concrete with enhanced workability and mechanical characteristics. This study evaluates the performance of SCC mixtures containing varying dosages of silica fume, focusing on rheological properties, compressive strength development, durability indicators, and microstructural refinement. Experimental investigations were conducted on mixtures with 0%, 5%, 10%, and 15% silica fume by mass of cementitious material, maintaining constant water-to-binder ratio and superplasticizer dosage. Fresh properties were assessed via slump flow, T<sub>50</sub> slump flow time, and V-funnel tests; hardened performance was evaluated through compressive strength, water absorption, and rapid chloride penetration tests at 7, 28, and 90 days. Results indicate that inclusion of silica fume up to 10% significantly improves flowability retention, reduces segregation risk, and boosts compressive strength by up to 25% at 28 days, compared with control SCC. Durability metrics demonstrated marked reductions in permeability and enhanced resistance to chloride ingress. Microstructural analysis via scanning electron microscopy revealed a denser cement matrix and refined interfacial transition zones. Optimal performance was achieved with 10% silica fume; higher dosages yielded marginal gains but reduced workability. Findings align with engineering practices and technologies available up to 2016, offering guidance for sustainable SCC design in precast and in-situ applications.
Keywords
Self-compacting concrete, silica fume, rheology, compressive strength, durability, interfacial transition zone, high-performance concrete
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