Quantity of concrete water reducing agent

Concrete water reducer is a water reducer used for concrete. Its chemical name is methylene dimethyl naphthalene sulfonate sodium polymer. The main function is to reduce the amount of water used for mixing. Suitable for strength grades of C15 to C60 and above. What is the appropriate amount of concrete water reducer for normal concrete engineering? What happens when too much concrete water reducing agent is added?

1、 What is the appropriate amount of concrete water reducer?

The amount of admixture required for a concrete mix depends on the requirements of the mixing plant, and the admixture parameters vary for different grades of concrete. The general low-end parameters are 1.8% -2.2%, and the dosage is 5-7kg.

The dosage of reducing agent is generally 1.5-2.0% of concrete, and 1.0-1.2% for large-scale projects. In addition, the dosage of different types of water reducing agents varies. There are ordinary water reducing agents and high-efficiency water reducing agents, with a dosage of about 1% -2%.

2、 What will happen if too much concrete water reducing agent is added

Adding water reducing agents to concrete can remove some of the moisture in the concrete and alter its properties appropriately. However, if the dosage is too large, it can also cause changes in the performance of the concrete. Adding too much will have the following effects:

1. Only water reducing agents with water reducing properties can cause excessive collapse, segregation, bleeding, and compaction of concrete when used in excessive amounts.

2. Excessive use of water reducing agents with retarding and air entraining effects can lead to excessive retarding of concrete, high air content, slow solidification of concrete, and reduced concrete strength.

In general, adding too much water reducing agent to concrete can cause it to become brittle. Therefore, before using water reducing agents, the appropriate dosage after trial production should be determined based on the actual construction requirements and material characteristics of the project before they can be put into use. Only in this way can the water reducing agent exert its performance and avoid excessive or insufficient dosage.

Summary: Adding water reducing agents to concrete can reduce water usage. The dosage of general water reducing agents is determined based on the actual construction requirements and material characteristics of the project. The normal dosage of reducing agent is 1.5-2.0% of concrete, and the dosage for large-scale projects is generally 1.0-1.2%. It is not advisable to add too much concrete water reducing agent, as excessive addition can lead to excessive collapse, segregation, bleeding, and hardening of the concrete. Adding too many water reducing agents with retarding and air entraining effects can also lead to excessive retarding of concrete.