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[SEAOC] steaming concrete

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We have a project of making thousand of precast bridge deck segments of
size ~3.5mx7mx2m high. Because of turn over cycle and then early strength
requirement these segments after cast will be steam heated for about 2hrs
maximum during the initial 12 hrs curing process. This is particularly
necessary in the forthcoming Winter.  
The precast operation utilizes the freshly cast unit and put it into a
match cast position forming formwork for the next new unit to be cast.
There is concern over the match cast unit being cooked again together with
the next new unit. Do you have info on the short or long term durability
effect or any other effects on re-heating concrete units of this kind?
don't mind to pay for reply or articles are available.
Leon Chan