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TheOperatingManualofPC—2YConcreteAir-entrainingAgent


PC--2Y concrete air-entraining agent, based on the rosin thermopolymer PC—2 air-entraining agent, is a new product of our company which has been researched and tested for many times. It is obtained by conducting a series of physical and chemical reaction by adding many other organic compounds and inorganic compounds. PC--2Y concrete air-entraining agent is more convenient to use. The agent can produce tiny and independent bubbles in the process of concrete mixing so it can effectively improve the workability of the concrete mixture and this is beneficial to construction and can enhance the pouring quality of the concrete. Furthermore, because of the tiny and independent bubbles, the water pathways are blocked and the micro-structure of the concrete is thus better off, which contributes to improving the concrete’s durability. The functions of PC--2Y concrete air-entraining agent are as followings: water-reducing, air-entraining, improving the workability of concrete (including its pump ability), as well as the durability (including its frost-resistance, anti-permeability and corrosion resistance etc.).


Applicable scope
1. This product is widely applied in the port engineering, water conservancy project, industry and civil constructional engineering, highway and bridge engineering, as well as other concrete works with durability requirements. It’s also suitable for various kinds of concrete and reinforced concrete, especially for the frost-resistance concrete and the waterproof concrete construction.
2. Applied to those concrete requiring high-qualified workability of concrete mixture


Dosage
1. The mixing amount of PC-2Y air-entraining agent is determined by controlling the air content in the concrete mixture. The air content depends on the relative standards, regulations, or the clients’ requirements. As for the mixing amount, the common amount is always 0.01% to 0.04% of the amount of cement; when the amount is used to improve the concrete workability, the percentage should be 0.01% to 0.02%; if it refers to enhance the durability and freeze-thaw resistance of the concrete, the amount should be 0.02% to 0.04%. And when using HF vibrators, the mixing amount should be properly increased. Generally speaking, the specific mixing amount is subject to the site air content.


2. Solution preparation
PC--2Y air-entraining agent needs to be compounded into solution and the mixture ratio (weight ratio) is: 
air-entraining agent : drinking water = 1: 30


3. Solution preparing method:
Put one share of PC--2Y air-entraining agent into 30 share of water and stir completely till the air-entraining agent fully dissolves. Then the air-entraining agent solution at 3.2% concentration is made.


4. Calculation of solution dosage
the dosage of the air-entraining agent solution at 3.2% concentration = the amount of cement × the mixing amount of the air-entraining agent× 31


5. It is better to add the air-entraining agent solution into the blending water first and to prolong the concrete mixing time by 30 to 60 seconds so that the solution will disperse more easily.


6. PC--2Y air-entraining agent can be used with other concrete water reducing agent, retarder or early strength agent etc.. But when it is used together with Calcium chloride, PC-2Y air-entraining agent solution should be added into the mixture first and after being stirred properly, Calcium chloride solution can be put into.


7. PC-2Y air-entraining agent solution is not suitable for being contained in the metal containers such as iron containers for a long time.


8. When there is any coal ash contained in the gelled material or cement, the mixing amount of air-entraining agent should be increased by 30% to 70%. The specific mixing amount is subject to the tested mixing amount which meets the demand of concrete air content.


Basic properties and technical features:
Basic properties:
External appearance: dark brown colloid              active ingredients: ≥40%
PH value: >9                                    insoluble matter: < 1%
Technical features
Ratio of bubble: ≥22%          Time for defoaming: ≥120mins
Bubble content: ≥300           solid content: ≥58%
Chloride ion content: ≤3%        water reducing ratio: ≥6%
Compressive strength ratio: 3D, 7D, 28D: 90~80%
Relative durability: freeze thawing 200 times ≥80%
No corrosion to the steel bars


Package and storage
1. This product is wrapped in the 40kg or 50kg paper barrel package (containing plastic inner bag).
2. This product with the shelf life of two years, should be stored indoor. If it has been stored for a long time, please stir it first and it can be used to compound solution.

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