1. How much is the appropriate amount of concrete water-reducing agent?
Concrete water-reducing agent is a water-reducing agent used for concrete. Its chemical name is methylene dimethyl dinaphthalene. Sodium sulfonate polymer mainly plays the role of reducing mixing water consumption. It is suitable for normal concrete projects with strength levels from C15 to C60 and above. So how much concrete water-reducing agent is appropriate?
The amount of admixtures required for one side of concrete is determined according to the requirements of the mixing station. Different concrete grades have different admixture parameters. The general low-label parameter is 1.8%-2.2%, and the dosage is 5-7kg.
The dosage of reducing agent is generally 1.5~2.0% of concrete, and the dosage for large-scale projects is generally 1.0~1.2%. In addition, different types of water-reducing agents have different dosages. There are ordinary water-reducing agents and high-efficiency water-reducing agents, and the dosage is about 1% to 2%.
2. What will happen if you add too much concrete water-reducing agent
Adding water reducing agent into concrete can remove part of the water in the concrete and appropriately change the properties of the concrete. However, if the amount is too much, it will also cause changes in the properties of the concrete. Adding too much will have the following effects:
1. For water-reducing agents that only have water-reducing properties, excessive dosage will cause excessive concrete slump, segregation, bleeding, and concrete hardening.
2. If the amount of water-reducing agent with retarding air-entraining effect is too much, the concrete will be excessively retarded and the air content will be too high, which will cause the concrete to set too slowly and reduce the strength of the concrete.
Generally, adding too much concrete water-reducing agent will cause the concrete to become brittle. Therefore, before using the water-reducing agent, the best solution must be determined through trial preparation based on the construction requirements and material characteristics of the actual project. Only use the optimal dosage before putting it into use, so as to ensure that the water-reducing agent can exert its maximum performance and avoid excessive dosage or insufficient dosage.
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