Accelerator: an admixture added to concrete that can quickly set and harden the concrete. The liquid alkali-free accelerator developed by our company is very rare in its application reports. This type of accelerator can solve some common problems of alkaline accelerators, such as the harm to the underground construction environment, the harm of alkali aggregate reaction, the harm of high pH value during use, and the loss of later strength of shotcrete. Its admixture only accounts for 2% to 3% of the cement content in the concrete, but it can make the concrete initially set within 5 minutes and finally set within 10 minutes. In order to achieve the purpose of emergency repair or rapid setting of concrete in wells. It is an indispensable additive in the construction method of shotcrete. Their function is to accelerate the hydration and hardening of cement and form sufficient strength in a very short time to ensure the requirements of special construction.

 

Technical performance 1. Setting time: initial setting 1～5min, final setting 5～10min, suitable dosage is 3-5% of the amount of gelling material; 2. Alkali metal content <1%, non-toxic, odorless and non-irritating;

 

3. Fineness: 80μm mesh sieve, the sieve residue is less than 10%; 4. The early strength of sprayed concrete is high, and its 28-day-old compressive strength preservation rate reaches 80-100%; The steel bar has no rust effect, improves the impermeability label, and the condensation is fast.

 

Method of use First, mix the sprayed materials evenly according to the ratio of shotcrete, and add accelerators randomly when spraying. It is recommended that you select the appropriate dosage and setting time measurement test before use. [3]

 

Precautions Please do not add this product when the material is being stirred. Because stones and sand contain a lot of water, the quick-setting agent absorbs water in a short period of time and decomposes its quick-setting components when it is not sprayed, which affects the setting time and reduces the strength of the concrete, which will lead to spraying. adverse effects of concrete. Before use, a trial mix test should be carried out for the cement varieties used in the project, and the dosage should be selected before it can be used in large quantities. Expired cement cannot be used, and cement that does not meet national standards cannot be used. Proper storage is required for accelerators to prevent moisture agglomeration and failure. Strengthen early water spray maintenance to ensure later strength. Strictly grasp the water-cement ratio. For projects with water seepage and leakage, the dosage must be increased.