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Concrete Admixture Polycarboxylate Superplasticizer

In the age of the building industry, in addition to the most important cement building products, there is also a product plays an important role, that is the concrete additives, a variety of reasonable use of this product can greatly reduce costs on the cost, that what are the additives, how we can reasonable use, today will give you do a simple introduction.

The nature of the Polycarboxylate superplasticizer

Polycarboxylic acid water reducing agent (PCE) is one of the most important concrete water reducing agents because of its excellent performance. Compared with other products such as polycondensates, they fluidize cement even at lower water cement levels, require relatively lower doses and have longer slump retention.

It is synthesized from unsaturated monomer of carboxylic acid and large monomer of long chain alkane. PCE can be generally divided into polyesters and polyethers according to the connecting form of its main and side chains. The structure of polyester -PCE is characterized by the ester bonds of its main and side chains.

The key of the synthesis technique is the esterification or transesterification of the macromolecule monomer with methoxy polyethylene glycol and acrylate. Polyether reactions are obtained by radical polymerization using the direct polymerization of large and other small monomers of alkenyl polyethylene glycol ethers (carboxylic acids and sulfonic acids) in an aqueous solution.

The types of the concrete admixture

There are many types of water reducing agent, according to incomplete statistics, there are 15 kinds of as much as possible. Today, we will give you the most common types of water reducing agent.

  • The first is water reducing agents, whose name itself defines their use to minimize water requirements in concrete mixtures. Workability is an important performance of concrete, adding water will improve the performance of concrete, but if the amount of water is more than required, it will affect the strength and durability of concrete. In addition to improving workability, it also improves the strength of concrete, good combination between concrete and steel, to prevent cracking, segregation, honeycomb, seepage and so on.
  • Retarders slow down the hydration rate of cement in the initial stage and increase the initial setting time of concrete. These are also called retarders and are particularly suitable for high temperature areas where concrete sets quickly.
  • Accelerating admixtures are used to reduce the initial setting time of concrete. They speed up the initial stage of concrete hardening, so they are also known as accelerants. These accelerants also increased the strength of early concrete by increasing the hydration rate.

 

How to use the concrete admixture

In the process of using additives, the solid content of additives is different, so in the process of using, in order to make it evenly mixed, we will dilute with water first. When the dilution reaches a certain proportion, we will carry out the relevant mixing, which can play the role of concrete on the ground.

The above is the latest relevant knowledge about concrete and relevant use skills, there is any you want to know, you can contact us as soon as possible, will try to answer for you.

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concrete admixture polycarboxylate superplasticizer
concrete admixture polycarboxylate superplasticizer
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