Industry News

Regarding how to improve the strength of concrete, many manufacturers have always been concerned about the issue. In fact, Sodium gluconate can be easily done. The main steps and measures are as follows:

1. Using Sodium gluconate, the W/C ratio can be reduced, which can increase the strength of the concrete. This is the most advanced type of concrete.

2. It is difficult to construct large and heavy pouring projects. Due to the addition of sodium gluconate, the improvement of concrete operability and the delay of setting time can avoid the formation of joints on the structure, and as a result, the structural strength can be improved.

3. It is of great significance to keep the W/C ratio constant and improve the operability in hot areas. A large amount of sodium gluconate was used when building bridges in the Middle East.

4. Adding sodium gluconate to the concrete mixture can delay the setting time, which is very important for long and difficult perfusion.

5. Now in the concrete industry, ready-mixed concrete is prepared in a central location and then transported by mixer truck. In this case, it is important to increase the operability and delay the initial setting time.

6. Lowering the W/C ratio can make concrete with higher strength and durability. Sodium gluconate can be used to achieve this purpose. This is very important for high-strength reinforced concrete.

7. The prefabricated mortar for masonry must be usable for a long time. Adding sodium gluconate can extend the working period.

8. Oil well grouting cement slurry is difficult to operate due to the high temperature. After adding sodium gluconate, the mud concrete can work at 170℃ for several hours.

How to test Sodium gluconate?

Sodium gluconate can be oxidized by potassium permanganate in acidic solution. The excess potassium permanganate reacts with potassium iodide to precipitate iodine, which is titrated with sodium thiosulfate using starch as an indicator. The inspection method is as follows:

Pipette 1mL of plating solution into a 250mL Erlenmeyer flask, add 50mL of water, and add potassium permanganate standard titration solution with shaking until it is reddish (the above is oxidized Fe2+, not counting the reading). Add 6mL of 3mol/L sulfuric acid, add 1g of manganese sulfate, heat to above 70%, accurately add 20mL of 0.02mol/L potassium permanganate standard titration solution, and then heat and boil for 2min. If the red color fades, add a certain amount of permanganese Potassium acid, boil again.

Cool to room temperature, add 2g potassium iodide, shake well, titrate with 0.1mol/L sodium thiosulfate standard titration solution to light yellow, add 2mL starch indicator, the solution turns blue, continue titration until the blue disappears as the end point.