Principle of Cement Accelerator Acceleration and Notices in Its Use

Strictly speaking, it can only be concrete accelerator, not cement accelerator. When accelerator is added to concrete, sodium aluminate and sodium carbonate, the main components of accelerator, react rapidly with gypsum in cement in alkaline solution to form sodium sulfate, which deprives gypsum of its original retarding effect, resulting in rapid hydration of calcium aluminate minerals and precipitation of hydrated product crystals in the solution. So that cement concrete can quickly set.

Matters needing attention:

1. Please do not add this product when mixing materials. Because stones and sand contain a lot of water, the accelerator absorbs water in a short period of time and decomposes its accelerating components when not sprayed. This will affect the setting time and reduce the strength of concrete, which will lead to the bad effect of shotcrete.

2. Before use, we should carry out trial mixing test for the cement varieties used in the project, and select the appropriate dosage, so that we can use it in large quantities. Storage of expired cement can not be used, cement that does not meet national standards can not be used. The accelerator should be properly stored to prevent damp caking failure. Strengthen early sprinkler maintenance to ensure late strength. Strict control of water cement ratio. The amount of leaking water should be increased in the project.