Calcium formate high-efficiency early strength agent for industrial construction has a significant fast curing effect

 The function of the early strength agent is to accelerate the hydration process of the cement under the condition of the existence of the liquid phase in the concrete, and improve the early strength. In winter, considering the effect of low temperature on the material, and the surface covering repair operation is relatively long, material freezing is likely to occur during the operation. Therefore, calcium formate has the advantages of simple operation, good maintenance, and good frost resistance and abrasion resistance, and can complete the repair construction of cement pavement sand.

1. Fast-pass cement concrete pavement or bridge deck pavement, especially the level crossing of the first, second and third level highways. When paving the cement concrete pavement in one direction, not only the pavement under construction cannot be opened to traffic, but also vehicles in other directions that cross the plane cannot. The use of calcium formate early-strength cement concrete for construction at night can provide convenient vehicle traffic in the shortest time.

2. Construction of cement concrete structures in a low temperature environment with the lowest temperature not lower than -5°C. Generally, it is necessary to use calcium formate early-strength agent to accelerate the setting and hardening of cement concrete to prevent freezing damage of cement concrete at lower temperatures, accelerate the turnover of formwork, and increase the construction rate. Especially in winter, calcium formate can be added to increase the early strength. Data shows that calcium formate is used in the amount and precautions. The use amount of one ton of dry mortar and concrete is about 0.5~1.0%, and the maximum addition amount is 2.5%. In summer, the intake of calcium formate is generally 0.3% to 0.7% of cement, and the addition of calcium formate increases as the temperature decreases.

3. Prestressed reinforced concrete structure. For example, the tensioning of prestressed reinforced concrete bridges at low temperatures or early tensioning at normal temperatures requires the use of early strength agents to accelerate the prestressing time and speed up the production of components. The formic acid in calcium formate is a weak acid, and there is a process of hydrolysis in the aqueous solution. Therefore, the aqueous solution of calcium formate should be weakly alkaline, and industrial calcium formate can also be used in reinforced concrete to have the effect of early strength and initial setting.

4. Quick repair of cement concrete pavement and bridges. When repairing, it is necessary to narrow the traffic lanes, causing traffic jams, breaking off or forcing traffic to bypass other roads. Especially on expressways or other toll roads with good or better benefits, they can be opened to traffic 1 hour earlier, which brings considerable toll benefits.

Reference dosage of calcium formate: The dosage per ton of cement mortar and concrete is about 0.5-1.0%, and the maximum addition amount is 2.5% of the cement amount. The amount of calcium formate is gradually increased as the temperature drops. Even if the amount of 0.3 to 0.5% is applied in summer, it will have an obvious early-strength effect.