Water reducing agents are widely used in the modern construction industry. When using it, we must have a full understanding of the performance of the selected water-reducing agent, such as: water sensitivity, dosage sensitivity range, optimal mixing time for laboratory mixing and bulk mixers, strength development rules, etc. The amount of water-reducing agent is low, and concrete is very sensitive to the amount of water-reducing agent. The mixer must be accurately measured, and the error must be less than ±1%. If the accuracy of the metering equipment is not reached and the dosage is inaccurate, it will make it more difficult to control the concrete out of the machine. , the slump is unstable. As the water-reducing effect of the water-reducing agent is released, the mixed particles of water and water-reducing agent are gradually released. The comb-shaped molecular chain of the water-reducing agent eventually turns the concrete into water particles that wrap around the cement particles, making the concrete flow well. sex. There are differences in the adaptability of water-reducing admixtures to different varieties, different batches of the same variety, and different storage times of the same batch. It is necessary to strengthen remixing and adjust the optimal dosage to maintain the stability of the concrete state. If the slump of the concrete delivered to the site is inappropriate, you can use a small amount of water-reducing agent to dilute it with water and adjust it so that the diluted water-reducing agent can quickly enter the concrete and mix evenly.
How to use water reducing agent and precautions
1. The commonly used dosage is 0.15~0.20% of the cementitious material (broken solid). When preparing ultra-high-strength concrete, add The amount can be increased to 0.30%.
2. Do not mix with naphthalene series water-reducing agent, aliphatic water-reducing agent, sulfamate water-reducing agent and melamine water-reducing agent.
3. During use, please be careful not to put the product in contact with your eyes, mouth and skin. It is recommended to use protective gloves and eyes. If it accidentally gets on it, please rinse it with plenty of water.
Packaging and Storage
1. Packaging and transportation shall be in 200Kg barrels, 1000Kg cans or car transport vehicles with tanks.
2. When storing, attention should be paid to the sealed container.
When calculating the amount of concrete water-reducing agent, most concrete companies calculate based on the percentage of the total amount of water-reducing agent per cubic meter of concrete cementitious materials, where cementitious materials refer to cement and mineral powder. , fly ash. In practice, the amount of water-reducing agent for C30 concrete is usually determined through experiments as the benchmark value. Then, based on the baseline value, the amount of water-reducing agent for each strength level of concrete is reduced by 0.1%, and the strength level of concrete increases by one level, reducing The amount of aqueous agent is increased by 0.1%~0.2%. This method only relies on experience and can easily lead to undesirable phenomena such as concrete slump being difficult to control, segregation, and bleeding.
The use of water-reducing agents has improved the quality of modern buildings. Mastering the dosage can better bring out its effect. </p
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