A false set, different to flash set, can be caused by
excessive formation or gypsum crystals shortly after placement, which leads to
However the concrete may be re-tempered and re-mixed to
restore its original plasticity.
The re-tempering or
re-mixing of a false set concrete may be done without any long term damage to
the concrete as long as the maximum allowable water / cement ratio and slump
are not exceeded.
Special care needs to be taken whilst re-tempering.