1. Ordinary water reducing agent: an admixture that can reduce the amount of water used for mixing when the concrete slump is basically the same;
2. Early strength agent: an admixture that accelerates the early strength development of concrete;
For example, adding 0.15% sodium gluconate can extend the initial setting time of concrete by more than 10 times, that is, extend the plasticity time of concrete from a few hours to a few days without affecting its fastness.