Concrete air-entrainer
An air-entraining agent and concrete technology, which is applied in the field of concrete air-entraining agent, can solve the problems of poor adaptability, low air-entraining efficiency, and failure to meet the air-entraining requirements of concrete and special concrete, etc., achieve high air bubble stability, improve fresh mix Performance and hardening durability, strong water solubility effect
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[0031] An example of preparation is as follows:
[0032] Control substance 1:
[0033] Add 250g of water to a 1000ml reaction kettle, heat up to 90°C, add 30g of sodium carbonate, dissolve, add 100g of small pieces of rosin in the state of boiling water,
[0034] Add in portions to dissolve completely. After cooling to 50°C, about 40g of 30% potassium hydroxide solution was added dropwise to adjust the concentration of the obtained air-entraining agent solution to 30±1%, and the pH value was 9-10.
[0035] Control substance 2:
[0036] Add 250g of water into a 1000ml reaction kettle, raise the temperature to 90°C, add 25g of sodium carbonate, dissolve, add 100g of small pieces of rosin in boiling water, add in portions to make it completely dissolve. After cooling down to 60°C, add about 40g of 30% potassium hydroxide solution dropwise, add 5g of triethanolamine, stir for 30min, add about 40g of cooling water dropwise at a uniform speed, adjust the concentration of the obta...
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