Unlike specimens in the H2SO4 environment where slight surface
leaching was noticed, samples cured in Na2SO4 medium showed no sign of leaching throughout the 84 days curing period.
In fact, at the end of the last batch there was no eroded residue of
cement paste, sand particles or latex at the base of the plastic container.
Hence, variation in weights of specimens at the end of the
curing exercise was observed to be insignificant.