Testing & QC
RCPT (Rapid Chloride Permeability Test)
// Definition
A test measuring the resistance of concrete to chloride ion penetration, indicating durability in marine or de-icing environments. Result reported in coulombs.
RCPT classifications (ASTM C1202): <100 negligible, 100-1000 very low, 1000-2000 low, 2000-4000 moderate, >4000 high. Lower is better.
// Related Indian Standards
ASTM C1202
// Cross-references
GGBS (Ground Granulated Blast Furnace Slag)
A by-product of iron manufacturing, ground to cement fineness. Used as a supplementary cementitious material at 25-65% replacement of cement.
Fly Ash
A by-product of coal-fired power plants, used as a pozzolanic addition to concrete. Reacts with calcium hydroxide to form additional C-S-H.
Permeability
The ability of concrete to allow fluids or gases to pass through it. Lower permeability = better durability against chloride, sulfate, and freeze-thaw attack.
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