There are various types of
concrete admixtures like accelerators admixtures, retarders admixtures,
water-proofing admixtures and air entraining admixtures. Some of these
admixtures are likely to contain water soluble chlorides which are likely to
cause corrosion of reinforcement in the reinforced concrete. In fact, the use
of such chlorides containing admixtures has been prohibited by IS: 456-1964, IS
2645, etc to 2% of the total mass.
Test can be conducted in 3 methods as IS 6925 and are as follows:
A. The volumetric method may be used when the chloride concentration
is nearly 1 percent or above.
B. The gravimetric method may be used when the chloride concentration
is more than 2.5 percent.
C. The turbidimetric method may be used when the concentration of chloride
is as low as 2 ppm and above. This is adopted when chloride ions are very low.
Let see how to test this in LAB:
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