(1) on the strength of the impact of the addition of excess will cause concrete 24 hours or even 72 hours still do not solidify, thus affecting the early strength of the concrete needs and delay the construction progress.
It has no obvious influence on the age-appropriate concrete. (2) The effect on shrinkage has no obvious effect on the contraction.
Excessive use will cause the top of the concrete due to excessive water evaporation caused by dry shrinkage and shrinkage cracks.
(3) to resist the effect of frost durability, the durability of concrete with retarder is similar to that of the additive.