Sodium gluconate is a kind of sodium polyhydroxy carboxylic acid, which is also known as sodium hydroxy caproate, which is white or light yellow crystalline granule or powder, easily soluble in water, slightly soluble in alcohol, and insoluble in ether. The product has good effect of retardation and excellent flavor, and is widely used in construction, washing, food and medicine industry.
Ⅰ.After adding a certain amount of sodium gluconate to cement, the plasticity and strength of concrete can be increased, and there is a blocking effect.
Ⅱ.By adding water reducing agent, water can reduce the cement ratio (W/C).The following effect is obtained by adding sodium gluconate: first, the increase of the working ability in water to cement ratio (W/C), the addition of sodium gluconate can enhance the work.At this time, sodium gluconate is the role of plasticizer.When the amount of sodium gluconate is less than 0.1%, the degree of improvement of the working degree is directly proportional to the amount of the addition.Second, increase the strength when the cement content remains constant while the water content in concrete can be reduced (i.e. W/C decrease).When the amount of sodium gluconate is 0.1%, the amount of water can be reduced by 10%.Third, reduce cement content and cement content to reduce, W/C ratio remains unchanged.At this point, sodium gluconate is used as a cement reducing agent.In general, the following two aspects are important for the performance of concrete: shrinkage and heat generation.
Ⅲ.Sodium gluconate can significantly delay the initial and final solidification time of concrete.The dosage of 0.15%, starting time of solidification of logarithm and with addition quantity proportional relationship, namely with addition amount plus one times, and initial solidification time delay to ten times, which makes working time extend from a few hours to a few days and the intensity of undamaged.This is an important advantage especially when the heat and the time to be placed are longer.
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