Sodium gluconate is used as water reducing agent and retarder in concrete engineering. Its water-reducing, plasticizing, retarding effect is very significant, can greatly improve the workability of concrete, reduce slump loss, improve the later strength of concrete, as retarding agent can make the initial setting time from a few hours to a few days without damage strength. And a wide range of applications, pumped concrete, large flow concrete, mass concrete, high strength concrete can be used.