Silica fume (microsilica) in concrete improves which property most significantly?
Choose the correct answer
Workability (slump)
Reduces permeability and significantly increases strength (High Performance Concrete applications)
Reduces cement content only
Setting time
Correct Answer
B. Reduces permeability and significantly increases strength (High Performance Concrete applications)
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Silica fume (IS 15388): ultra-fine amorphous SiO2 (particle size ~0.1 μm = 100× finer than cement). It fills micro-voids between cement grains AND reacts pozzolanically. Primary improvement: very low permeability and very high strength (High Performance Concrete, HPC). Also improves bond between aggregate and paste.
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