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Slide
This question is frequently asked regarding durability. Hooton's work clearly shows that the addition of silica fume provided improvements in concrete performance beyond what can be achieved by reducing water-cementitious materials ratio.

Data are presented on the next slide.

Hooton, R. D., Pun, P., Kojundic, T., Fidjesol, P., "Influence of Silica Fume on Chloride Resistance of Concrete," Proceedings, PCI/FHWA International Symposium on High-Performance Concrete, New Orleans, October 1997, pp. 245-256.