What superplasticizer is better for concrete?

According to the water reduction and enhancement ability of the superplasticizer, it is divided into ordinary superplasticizer (also known as plasticizer, the water reduction rate is not less than 8%), high-efficiency superplasticizer (also known as super plasticizer, the water reduction rate is not less than 14%) and high-performance superplasticizer (the water reduction rate is not less than 25%), and is divided into early strength type, standard type and retarding type. According to the composition of the materials, it is divided into: (1) lignosulfonates; (2) polycyclic aromatic salts; (3) Water-soluble resin sulfonates.

Ordinary superplasticizer should be used for concrete construction with a minimum daily temperature of more than 5. The high-efficiency superplasticizer is suitable for the construction of concrete with a daily minimum temperature of more than 0, and is suitable for the preparation of large-fluidity concrete, high-strength concrete and steam-cured concrete. At present, several water reducers commonly used in the market are:

Sodium lignosulfonate superplasticizer, naphthalene superplasticizer, aliphatic superplasticizer, amino high-efficiency superplasticizer, polycarboxylic acid superplasticizer, etc. Of course, choose what superplasticizer for your specific situation!

Case-by-case analysis. At present, there are sodium lignosulfonate superplasticizer, naphthalene superplasticizer, aliphatic superplasticizer, amino high-efficiency superplasticizer, polycarboxylic acid superplasticizer, etc. The corresponding water reducer needs to be selected.

Supplement: The concrete superplasticizer is to reduce the water consumption in the mixing process, reduce the water-cement ratio, improve the rheological properties of the concrete mixture and improve the strength of the cement concrete under the premise of maintaining the slump of the concrete mixture. According to its main functions, it can be divided into four categories:

1. Admixtures to improve the flow and deformation properties of concrete mixture: including various water reducers, air entraining agents and pumping agents. 2. Admixtures that adjust the setting time and hardening properties of concrete:

Including retarder, early strength agent, quick-setting agent, etc. 3. Admixtures to improve the durability of concrete: including air-entraining agents, waterproofing agents, and rust inhibitors.

4. Other admixtures to improve the properties of concrete: including air entraining agents, expansion agents, antifreeze agents, colorants, waterproofing agents and pumping agents.

The superplasticizer refers to the fact that it can reduce the water consumption of mixing and improve the strength of concrete under the condition that the workability of concrete and the amount of cement remain unchanged; Or under the condition that workability and strength remain the same, the amount of cement can be saved.

According to its water reduction and enhancement ability, it can be divided into ordinary superplasticizer (also known as plasticizer) and high-efficiency superplasticizer (also known as high-efficiency superplasticizer), which can be divided into first-class products and qualified products.

It is divided into: (1) water sulfonate; (2) polycyclic aromatic salts; (3) Water-soluble resin sulfonate.

Ordinary superplasticizers should be used for concrete with a daily minimum temperature of more than 5. The high-efficiency superplasticizer should be suitable for concrete with a daily minimum temperature above 0, and also suitable for the preparation of high-fluidity concrete, high-strength concrete and steam-cured concrete.

After adding the superplasticizer to the concrete mixture, it has a dispersing effect on the cement particles, which can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; Reduce the amount of cement per unit and save cement.

The superplasticizer belongs to the anionic surfactant, including lignosulfonate, naphthalene sulfonate, formaldehyde polymer, etc. The appearance form is divided into water agent and powder agent. According to the water reduction and enhancement ability of the superplasticizer, it is divided into ordinary superplasticizer, high-efficiency superplasticizer and high-performance superplasticizer, and is divided into early strength type, standard type and retardation type respectively.

Summary. Pro-<>

<> "Hello! Glad to serve you! The functions of cement superplasticizer are as follows:

Dispersion: The formation of a solvated water film makes the cement particles have an association effect and increase the fluidity. Lubricating effect:

Adsorption of the same charge forms electrostatic repulsion and reduces the sliding resistance between cement particles. Steric hindrance: adsorption of hydrophilic base polar branches to form a stable solvated water film, this layer of water film has a good lubricating effect, can effectively reduce the sliding resistance between cement particles, so that the fluidity of concrete can be further improved.

The slow-release effect of grafted copolymer branched chains: in the process of preparation of new superplasticizers such as polycarboxylic acid superplasticizers, some branched chains are grafted on the molecules of superplasticizers, which can not only provide steric hindrance effect, but also slowly cut off in the high alkalinity environment of cement hydration, so as to release polycarboxylic acids with dispersion, so as to improve the dispersion effect of cement particles and control the slump loss.

What does cement superplasticizer do.

<> <> "Hello! Glad to serve you! The functions of cement superplasticizer are as follows:

Dispersion: The formation of a solvated water film makes the cement particles have an association effect and increase the fluidity. Lubricating effect:

Adsorption of the same local potato seed charge to form electrostatic repulsion and reduce the sliding resistance between cement particles. Steric hindrance: adsorption of the branch chain of Tongqing with strong hydrophilic polarity to form a stable solvated water film, which has a good lubricating effect and can effectively reduce the sliding resistance between cement particles, so as to further improve the fluidity of concrete.

The slow-release effect of grafted copolymer branched chain: in the process of preparation, some branched chains are grafted on the molecules of the superplasticizer in the preparation process of novice bucket type superplasticizer, which can not only provide steric hindrance effect, but also be slowly cut off in the high alkalinity environment of cement hydration, so as to release polycarboxylic acids with dispersion, so as to improve the dispersion effect of cement particles and control the slump loss.

Superplasticizer is a kind of concrete admixture that can reduce the amount of water used for mixing under the condition of maintaining the slump of concrete basically unchanged. Most of the nucleus belong to anionic surfactants, including lignosulfonate, naphthalene sulfonate, formaldehyde polymer, etc. After adding the concrete mixture, it has a dispersion effect on the cement particles excavated in the base row, which can improve its workability, reduce the unit water consumption, and change the fluidity of the concrete mixture. Or reduce the amount of cement per unit and save cement.