Roads, bridges and rail transit

In transportation infrastructure exposed to harsh environments, silica fume concrete acts as "armor" against various forms of deterioration, extending structural service life.

Fortress Effect Against Chloride Ion Ingress:

· By refining the capillary pore network of concrete, silica fume transforms it from a "connected state" to a "closed or blocked state," drastically increasing the tortuosity of the path for chloride ions (Cl⁻), thereby significantly reducing the chloride diffusion coefficient. This is crucial for bridge piers, abutments, and wharves in de-icing salt or marine environments, effectively preventing reinforcement corrosion.

Enhanced Abrasion-Erosion and Cavitation Resistance:

· In hydraulic structures (spillways, plunge pools) or bridge piers subjected to water flow scour, concrete must withstand the abrasion and cavitation of high-speed, sediment-laden water. The extremely high surface strength and density of silica fume concrete make its abrasion-erosion resistance 1.5 to 2 times that of conventional concrete.

Freeze-Thaw Resistance (Frost Durability):

· In cold regions, freeze-thaw damage is a major threat to concrete. The low permeability of silica fume concrete means less freezable water is present, and its high strength better resists the expansive pressure generated by freezing water. Combined with air-entraining agents, it achieves excellent freeze-thaw durability, easily withstanding over 300 rapid freeze-thaw cycles.