Tartaric acid and seignette salt

Tartaric acid and seignette salt both have a solid retarding effect on cement and have been widely used in ordinary concrete. The dosage of tartaric acid is generally 0.01%~0.1%. Tartaric acid has a strong retarding effect at high temperatures, so it is suitable for use in oil well cement, especially in ultra-deep well cementing. The dosage is 0.15%~0.50% of cement. When less than 0.10%, it may have a setting-accelerating effect. Tartaric acid is a stable high-temperature retarder when above 150°C and under very high pressures. It can not only improve the flow performance of cement slurry but also has no noticeable impact on the strength of cement stone.

The combination of tartaric acid and boric acid as a retarder not only has a good retarding effect but also improves the structure of the cement stone to give a fine-grained and uniform format and improving the mechanical strength. Since the addition of tartaric acid can increase the amount of water precipitation and water loss in the cement slurry, it is often used together with a water loss-reducing agent.