Do not add this product during the material mixing process, as pebbles and sand contain a high amount of moisture.Quick-setting agentShort-term water absorption; the accelerator decomposes its setting components when not applied, affecting the setting time and reducing the concrete strength, which can lead to poor performance of shotcrete.

2. When using setting accelerators, it is crucial to pay close attention to their compatibility with cement, the price of liquid setting accelerators, and to properly select the dosage of the accelerator while controlling the application conditions. Due to the large amount of cement used, high sand content, and the influence of the setting accelerator, the drying shrinkage of shotcrete is usually increased. Therefore, attention should be given to wet curing during molding to prevent cracking.

3. Pay attention to the proper dosage of the rapid-setting agent. Generally, the dosage should be increased in low temperatures and reduced in high temperatures. Traditional rapid-setting agents have certain side effects, and when compared to concrete without a rapid-setting agent, they will inevitably decrease the ultimate strength (28-day strength) of the concrete. Therefore, under the premise of meeting construction requirements, the dosage should be taken at the lower limit (less than the amount used for side walls compared to the top arch).

4. Enhance early-stage water spray maintenance to ensure later strength. Strictly control the water-cement ratio. For projects with seepage or leakage, increase the admixture dosage.

What are the characteristics of rapid-set agents?

The early strength is high, with a gradual reduction in later strength, not too significant.

The cement mixed with a rapid-set accelerator begins to solidify within 5 minutes of being sprayed, and sets very well within 10 minutes.

Enhancing the viscosity of concrete to prevent excessive rebound rate in shotcrete.

The rapid-setting cement admixture also prevents shrinkage of cement and enhances its waterproofing capability.

The product has no corrosive effect on reinforcing steel.