Even though, concrete is expected to progressively continue to
develop in compressive strength especially during the first one
month, in this case, only the NC increases by a very small amount.
MCs on the other hand, not only failed to increase in strength but
suffer minute reductions. Obviously, lack of appreciable progress in
strength particularly in the first one month could be the result of
counter destructive effect caused by H2SO4. At 28 days old for instance,
the NC should have reached the designed concrete strength,
but the impact of attack coming from the H2SO4 clearly hindered
this normalcy. Thus, the main consequence of introducing fresh
concrete into aggressive environment is the initiation of attack
prior to the development of normal strength. In this type of situation,
concrete may never achieve its designed strength.