Year1
- 桶装：
- 50kg
Contact information of alkali-free liquid accelerating setting agent: Contact person: Liu Xiaohong
It is a breakthrough in the traditional domestic liquid accelerating setting agent. It is highly corrosive and seriously irritates the skin and respiratory mucosa, affecting the health of workers engaged in shotcrete and damaging the concrete. It is a new type of practical alkali-free liquid accelerating setting agent that has shortcomings such as its later strength and inability to be matched with large-scale imported wet spray machines. It is also promoted and used in key parts of major hydropower, transportation, civil air defense and other projects. It is a new type of wet shotcrete admixture.
1. Scope of application
Alkali-free liquid accelerating admixture is mainly used for deep foundation pit treatment and support of urban high-rise buildings, transportation, hydropower tunnels, subway underground space bunkers, coal mine shafts and roadway ground slopes and emergency reinforcement projects. Shotcrete construction for military and industrial defense.
Two main features
The most significant feature of alkali-free liquid accelerator is that it does not contain alkali. We know that alkali is a cancer of concrete and seriously affects the later strength of concrete. This product does not affect the strength of concrete. Alkali-free liquid accelerating setting agent, in addition to the advantages of wide setting range of agglomeration block, strong adaptability to cement, fast hardening, early strength and no loss of strength in the later period, it can also be used in humid and water-bearing rock formations.
This product is non-toxic, odorless, non-irritating, and non-corrosive to the human body.
Good cohesion performance, small rebound rate, low dust concentration, no volatile gases that irritate eyes and skin.
The later strength retention rate of concrete is high quality and stable.
Concrete suitable for larger slumps has good anti-permeability properties and has no rusting effect on steel bars.
On imported large-scale wet spray machines, it has excellent performance and good compatibility, and can replace imported liquid accelerators.
3 Usage methods and precautions
Before use, a suitability test of alkali-free liquid accelerating admixture and cement should be conducted to determine the optimal dosage. The dosage of this product is % of the weight of cement. (The test method is: take grams of cement, grams of liquid quick-setting type, add water to the cement according to the water-cement ratio and stir for seconds, add liquid quick-setting agent, stir quickly for about seconds to install the mold, and use a Vicat meter to measure the setting time.
The freshness of cement has a great influence on the setting time. It is best to use new cement from the factory for shotcrete. Cement that is damp or has been stored for a long time has poor effect.
The shrinkage value of concrete mixed with accelerating setting agent is lower than that without accelerating setting agent. should be large, so start curing hours after spraying. The minimum curing time is two weeks and no less than a week.
Four inspection indicators: Implementation standard "Accelerating setting agent for shotcrete"
Serial number inspection item measurement unit standard Requirements for test results and conclusions
Setting time Initial setting: first-class product
Final setting: first-class product
Compressive strength first-class product
Compressive strength first-class product
Total alkali content % / Belonging to alkali-free
Remarks: % of cement (Jidong) gelling amount added
Conclusion: The test results fully meet the requirements for first-class products
Comparison between five similar industries Test results:
We only select foreign brands with large supply and relatively high quality for comparative testing:
Imported alkali-free accelerator as cement (Jidong) % of gelling amount added
/> Serial number Test item Measurement unit standard requirements Inspection result conclusion
Setting time Initial setting:: Unqualified
Final setting: Unqualified
Compressive strength qualified
Compressive strength qualified< br /> Total alkali content % / Belonging to alkali-free
Imported alkali-free accelerator as cement (Jidong) % of gelling amount added
Serial number test item measurement unit standard requirements test result conclusion< br /> Setting time Initial setting: Passed
Final setting: Passed
Compressive strength qualified
Compressive strength qualified
Total alkali content %/ is alkali-free
We only select brands with large domestic supply and relatively high quality for comparative testing:
Domestic alkali-free accelerators are unqualified products when added with % of cement (Jidong) gelling amount,
/> When the added amount is % of the gelling amount, it is a qualified product.
A brief introduction to the six accelerators for shotcrete that are currently the most widely used in my country:
At present, my country’s accelerators for shotcrete are There are three types of coagulants: liquid high-alkali accelerator, liquid low-alkali accelerator, aluminum-oxygen clinker, high-alkali accelerator powder.
Category price (yuan/ton) Alkali content remarks
Liquid high-alkali accelerator Setting agent reduces the strength of concrete
Liquid low-alkali accelerating setting agent reduces the strength of concrete
Aluminum-oxygen clinker high-alkali accelerating setting agent powder reduces concrete strength
Conclusion:
High-alkali accelerating setting agent It not only reduces the strength of the concrete, but also severely reduces the durability of the concrete due to the severe alkali aggregate reaction, causing serious damage to my country's large-scale tunnel projects, drinking water projects, high-speed rail supports, etc., and greatly reducing the quality of the projects.
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