Main types of air-entraining water-reducing admixtures

Air-entraining water-reducing agents can be divided into two types: ordinary and high-efficiency types
Ordinary air-entraining water-reducing agents:

1. Calcium lignosulfonate and magnesium lignosulfonate

Among the lignosulfonate water-reducing agents, lignosodium basically does not entrain air, while lignocalcium and lignomagnesium are both air-entraining water-reducing agents

2. Humate water-reducing agent Agent

Sodium humate, also known as sodium humate, is an air-entraining water-reducing agent with great air-entraining properties. The air-entraining amount is 3.0-5.6% in the suitable dosage range of 0.2-0.35%. , but the strength of concrete will be significantly reduced if it exceeds the appropriate dosage.

High-efficiency air-entraining water-reducing agent:

3. Methylnaphthalene iodate formaldehyde condensate

Polymer with methylnaphthalene as reaction starter Alkyl aryl sulfonate formaldehyde condensate such as MF water reducing agent is an air-entraining high-efficiency water reducing agent.

4. Sodium anthracene sulfonate formaldehyde condensate

Using crude anthracene or decrystallized anthracene oil as raw material and synthesizing anthracene sulfonate yellow condensate, the product is slightly smaller than sodium methylnaphthalene sulfonate Another high-efficiency air-entraining water-reducing agent developed

New high-efficiency air-entraining agent:

5. Modified lignin sulfonate

Lignin Modification has so far only been carried out on raw wood lignin and products have been put on the market. The first way to modify is to use chemical methods to remove low molecular weight lignin and reducing sugars through oxidative polymerization. The second modification approach is to use ultrafiltration and fine filtration methods, using membrane sharing technology.

6. Polycarboxylate-based high-efficiency air-entraining water-reducing agent

Since the polycarboxylate-based high-efficiency air-entraining water-reducing agent first appeared in the Japanese market in 1986, it has been developed to the fourth generation. The polycarboxylates produced in Japan have great air-entraining properties, and the air content suitable for construction needs can be controlled by adding an appropriate amount of defoaming agent. Excessive air entrainment will inevitably affect the strength of concrete, and polycarboxylate-based superplasticizer is no exception.

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