一，First, the amount of concrete water-reducing agent is appropriate
Concrete superplasticizer is used for concrete superplasticizer, chemical name is methylene dimethyl dinaphthalene sulfonate sodium polymer, mainly to reduce the role of mixing water, suitable for strength grade C15 to C60 and above normal concrete engineering, then how much is suitable for concrete superplasticizer?
The amount of admixtures required by one side of concrete is according to the requirements of the mixing station, and the parameters of different concrete admixtures are different. The general low label parameter is 1.8%-2.2%, and the dosage is 5-7kg.
The content of reducing agent is generally 1.5~2.0% of concrete, and the content of large projects is generally 1.0~1.2%. In addition, the variety of water reducing agent is different, the dosage is different, there are ordinary water reducing agent and high efficiency water reducing agent, the dosage is about 1% to 2%.
二，Second, what will happen if the concrete water-reducing agent is added
Adding superplasticizer to concrete can remove part of the water in concrete and appropriately change the properties of concrete, but if the amount is too much, it will also cause the performance of concrete to change, adding excessive will have the following effects:
1, only the water-reducing function of water-reducing agent, the amount of excessive will cause the concrete slump is too large, segregation, bleeding and concrete slab.
- If the amount of water-reducing agent with retarding air entraining effect is too much, it will lead to excessive retarding of concrete and too high gas content, which will cause the concrete to set too slowly, resulting in the reduction of concrete strength.
Under normal circumstances, the addition of excessive concrete superplasticizer will cause the concrete to become brittle, so before the use of superplasticizer, it is necessary to determine the best dosage and then put into use according to the construction requirements of the actual project, material characteristics, etc., after testing, so as to ensure that the superplasticizer plays its maximum performance and avoids excessive or insufficient dosage.
