FROM WASTE TO WONDER: HOW SILICA FUME TRANSFORMS CONCRETE

NTERNATIONAL MULTIDISCIPLINARY SCIENTIFIC RESEARCH CONGRESS, Sivas, Türkiye, 4 - 06 Haziran 2025, cilt.1, ss.787-803, (Tam Metin Bildiri)

This paper aims to explore the potential of silica fume, a byproduct of silicon production, as a

transformative material for achieving high-performance concrete (HPC). The methodology used

involves a comprehensive review and synthesis of existing research and literature on silica fume used

in concrete. This covers an investigation into properties and mechanisms through which silica fume acts

to enhance not only the mechanical strength but also the durability of concrete. A primary focus is the

exceptional pozzolanic reactivity of silica fume, which reacts with calcium hydroxide produced during

cement hydration to form additional calcium silicate hydrate (C-S-H) gel. This then reinforces the

matrices of concretes with compressive as well as flexural strength. Moreover, the extremely fine

particles of silica fume effectively fill the microscopic voids in the cement paste, producing a denser

and less permeable concrete structure. This density provides an enhancement to the resistance against

chemical attack and freeze-thaw cycles. The paper also delves into how silica fume enhances concrete

durability by improving resistance to sulfate attack, the Alkali-Silica Reaction (ASR), and carbonation.

Additionally, the study examines the strengthened bond between concrete and reinforcing steel when

silica fume is incorporated, leading to improved structural integrity. While acknowledging the numerous

advantages of silica fume, the paper also addresses its limitations, such as its higher cost compared to

other cementitious materials and the handling challenges posed by its fine particle size. Additionally,

the potential influence of silica fume on the final color of concrete and the increased risk of plastic

shrinkage cracking are addressed. In conclusion, silica fumes are a powerful tool for creating highperformance

concrete. By understanding its properties and potential drawbacks through the review of

existing knowledge, engineers can effectively utilize silica fume to construct robust, durable, and longlasting

concrete structures.