Why Is My Concrete Failing Permeability and Durability Tests?
A mix can hit its strength target and still fail RCPT or water penetration. The cause is capillary porosity — and microsilica is the standard fix.
“Our concrete passes compressive strength tests but fails permeability or durability requirements. What could be the reason?”
The answer
Compressive strength alone does not determine concrete quality. A concrete mix may achieve the required strength while still containing microscopic capillary pores that allow water and aggressive chemicals to penetrate.
These pores increase the risk of reinforcement corrosion, chemical attack, and premature deterioration.
SIO92 Micro Silica helps refine the concrete microstructure by filling these voids and promoting additional C-S-H formation. The result is a denser, less permeable concrete with improved durability.
Performance benefits
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Sio92 Microsilica complies with ASTM C1240 and IS 15388:2003, and is supplied in bags, jumbo bags and bulk tankers with batch test certificates.
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Why Use Micro Silica Instead of Increasing Cement Content?
Higher cement dosage raises heat of hydration, shrinkage and cost. Micro silica densifies the matrix instead — delivering strength and durability more efficiently.
We Already Use GGBS. Why Should We Also Use Micro Silica?
GGBS builds long-term strength and sulfate resistance; micro silica adds early strength, density and water tightness. Most high-performance mixes use both.
Is All Micro Silica the Same? How Do I Choose the Right Product?
Performance depends on SiO₂ content, fineness, moisture, LOI and manufacturing consistency. Here is the checklist engineers should use before approving a supplier.