The results of this investigation may serve as the basis for
some conclusions with regard to the curing of Portland cement concrete.
Some of the more important conclusions are as follows
l. A concrete, if it may be classed as such, consisting of
fine aggregate, cement, and water, is not subject to the
extreme effects of freezing as is a true concrete containing
a coarse aggregate.
2. Maximum loss of strength, which is evidently long-enduring
is suffered by concrete frozen in an extremely green
stage when frost enters mortar paste.
5. Freezing may be harmful at any time within the first week.
However, in most cases a recovery is indicated.
4. Steam curing, if not carefully controlled at optimum
conditions, will result in loss of strength in a concrete.
5. The expansion and drying which occur at the temperatures
in the steam chamber apparently are the cause of harmful
results in steam.curing.
It must be borne in mind that the limitations of data gathered
make these conclusions more indicative than conclusive. There is still
much room.for further research at this institution along the line of both
problems presented herein.
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