The quick-setting accelerator uses aluminum-oxygen clinker as its main component, so its appearance is powdery, and it will be in a solid state, easy to carry and carry. This kind of quick-setting agent is a construction product, so we often see the "factory" of the quick-setting agent in the industrial field as well as in the chemical field. Its standard can be used as long as it passes the national review standard. With the rapid use of accelerators , accelerator manufacturers have also increased a lot. Here I recommend several good coagulant manufacturers related information for consumers to refer to!
What is an accelerator?
Accelerating agents are admixtures that are incorporated into concrete to cause the concrete to condense and harden rapidly. Powdered solids, the amount of which only accounts for 2% to 3% of the amount of cement in the concrete, but can make the initial coagulation within 5min, final coagulation within 10min. In order to achieve the purpose of repair or rapid concrete condensation in the lane. It is an indispensable additive in the shotcrete construction method. Their role is to speed up the hydration of the cement and form a sufficient strength in a short period of time to guarantee the special construction requirements.
Accelerating agent formula
Cement accelerator formula:
Red Star 1 quick-setting agent is a kind of powder prepared from the ratio of aluminum oxide clinker (mainly composed of sodium aluminate), sodium carbonate and quicklime according to the ratio of 1:1:0.5. The suitable dosage is 2.5% to 4.0% of the cement quality.
7ll-type quick-setting agent is made of aluminum oxide clinker and anhydrous gypsum in a mass ratio of 3:1 with grinding. Suitable dosage is 3% to 5% of cement quality.
Type 782 quick-setting agent is prepared from the ratio of slush, alumina clinker and quicklime mass ratio r, 4.5%:14.5%:11%. The suitable amount is 5% to 7%.
Several other accelerators also use aluminum oxide clinker as the main component.
Accelerating agent is an admixture that can quickly coagulate and harden concrete. The main types of accelerators are inorganic salts and organic substances. The commonly used accelerators in China are inorganic salts.
Inorganic salt accelerators can be roughly divided into three categories according to their main components:
Sodium aluminate as the main ingredient of the accelerator;
Calcium aluminate, calcium fluoroaluminate, etc. as the main component of the accelerator;
A silicate accelerator (NaSiO2) as the main ingredient.
Accelerator standard
1. The density should be within ±0.02g/cm3 of the control value of the factory -
2. Chloride ion content should be less than the maximum control value of the production plant should be less than the maximum control value of the manufacturer
3. The total alkali content should be less than the maximum control value of the production plant should be less than the maximum control value of the manufacturer
4. The pH should be within ±1 of the manufacturer's control value -
5. Fineness - 80μ sieve should be less than 15%
6. Moisture content - ≤ 2.0%
7. Solid content should be greater than the manufacturer's minimum control value -
Its main components are aluminum oxide clinker (namely, bauxite, soda ash and quick lime clinker produced by proportioning) made by grinding.
Accelerating agent price
Accelerating agent according to the cement's adaptability ex-factory price between 600-750 yuan. Accelerating agent is an ingredient and the price is not expensive. Under normal circumstances, there are differences in the prices of accelerators from different manufacturers. In addition, factors such as the brand, model, specification, and purchase volume of accelerators can also affect the specific prices of accelerators. In terms of purchase volume, the greater the purchase volume, the more discounts and the cheaper prices.
Note: This price is for reference only! Due to geographical differences, of course, the price will be different. For more details on the prices, please refer to the local distributors!
Accelerating agent manufacturers
(1) China Easy FSA/First-Order Accelerator, Shaanxi Zhongyi Chemical Co., Ltd.
(2) Runchang J-85 coagulant, Jinan Runchang Chemical Co., Ltd.
(3) Ocean Shipping 25JW High Efficiency Hard Coagulant, Zhengzhou Maritime Special Cement Co., Ltd.
(4) RJD RJD Coagulant, Beijing Rejida Building Material Co., Ltd.
(5) Cobb UB card accelerator, Zhongshan Zhongzhen Kebao Special Building Materials Factory
(6) Hengfu HF coagulant, Shanghai Hengfu Technology Development Co., Ltd.
Usage of cement accelerator
Cement quick-setting agent is mainly used for spraying concrete and trapping engineering. Shotcrete can be used in tunnels, underground roadways and other projects to achieve rapid and high quality. How to incorporate the accelerator should be determined by the process conditions.
When dry shotcrete construction is used, powdered accelerators are added at the same time as the cement, coarse aggregates, and fine aggregates are added, and these materials can be mixed evenly after the compressed air is transported. Powdered accelerator liquids can be used in wet jets but need to be added at the nozzle in the form of a gas flow and not directly into the wet jet or pump. The liquid quick-setting agent is first dissolved in water upon spraying, diluted with water in an appropriate amount at the time of spraying, and added at the nozzle by means of a water pump or wind pressure, so that it is easy to incorporate the quick-setting agent uniformly.
Silica cement is added with an appropriate amount of accelerator. At a certain water-cement ratio and a certain temperature, the cement paste has plasticity, and its setting time can be controlled within 10 minutes. The general requirement for the accelerator is that the slurry has a good fluidity, and do not cause sharp, dry, plastic-free sharpening during stirring.
Precautions for using accelerators
1. Please don't add this product when the material is agitated. Because the stone and sand contain a lot of water, the quick-accumulation agent will absorb water in the short-term and decompose the quick-setting component when it is not sprayed, which will affect the setting time and reduce the concrete strength, which will lead to jetting. Bad effects.
2. Before the use, test the cement with the cement used for the construction, select the amount, and then use it in large quantities. Storage of expired cement cannot be used. Cement that does not meet national standards cannot be used. The accelerating agent is required to be properly stored to prevent it from being agglomerated and thus become ineffective. Strengthen early water spray maintenance to ensure late strength.
Editor's summary: We understand the criteria for accelerators, and we should go through the categories we want to use, and then choose to buy or not to purchase. When we use accelerators, we must pay attention to it. When mixing objects, do not suddenly add the accelerator. If the accelerator contains water, it will decompose other materials! After using the accelerator If it is not used, be sure to keep the accelerator in good condition. Do not place it in a damp place. If the accelerator is damp, it will affect the results. The most serious consequence is that it cannot be used anymore.
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