What is the role of sodium gluconate in water reducer？Sodium gluconate can be used as concrete water reducing agent, which has a high water reducing effect, effectively reduces the hydration reaction speed and time of concrete materials, and improves the plasticization and early strength of concrete.The role of sodium gluconate in water reducing agent as follows:
1． Adding 0.5-2.5% sodium gluconate (connected with solid powder meter) in the water reducing agent can greatly improve the adaptability of water reducing agent and cement fly ash and other cement materials, and improve the concrete strength.
2． Sodium gluconate with cement weight of 2.5-5.0 ‰ (connected with solid powder meter) can greatly reduce the slump loss of concrete, even reach to 1 hour without slump loss.
3． The use of sodium gluconate in water reducing agent can increase the water reduction rate of water reducing agent and promote the plasticization of water reducing agent. The water reducing and plasticizing effect of one part of sodium gluconate is higher than that of one equal amount water reducing agent.
4． Sodium gluconate has the retarding effect on cement concrete. After adding sodium gluconate, no other retarder can be added, but the effect of retarding pumping can be achieved. In the construction of high temperature and hot season or mass concrete operation, it is a difficult task to delay the initial setting time of concrete without affecting the strength of concrete. The plasticizing time of concrete can be extended from the initial hours to more than ten hours by adding sodium gluconate, which will not only affect its strength, but also improve the later strength of concrete.
In general, the following two aspects are important for the performance of concrete: shrinkage and heat generation. Sodium gluconate is used as water reducing agent by reducing thermal reaction, reducing shrinkage of cement, and improving plasticization of concrete.