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water reducing agent

It is always interesting to know about the changes that are taking place in the additives industry, as they have such a significant impact on the properties of concrete, as well as its placement and finishing.

Additives also have a big impact on how contractors do their jobs and how they get their bottom line.

User-oriented PCE water reducing agent

The main positive property of PCE water reducing agent and the new element they bring to the way additives are developed is that scientists can first decide what properties they would like to see in the PCE water reducing agent, and then design the molecules to get exactly that result. 

Up to this point, scientists have experimented with materials to track their performance.

But over time, it became known that many factors influence how PCE water reducing agent affect the behavior of concrete.

And additive companies have worked for a long time to solve all the problems. As a result, many changes were announced.

Basically, the changes revolve around the recognition that the conditions for using concrete and cement differ from region to region.

Therefore polycarboxylate-based additives must be designed to provide the same performance for each region. New achievements include:

• Longer shelf life — concrete that remains liquid or does not settle longer;

• Development of greater strength in the early stages of hardening;

• A product that does not provide additional entrainment of air into the concrete;

• An additive that functions the same in all regions of the country.

PCE water reducing agent, today, are the most effective industrial plasticizers of all water-reducing substances known to construction science.

The main advantage of PCE water reducing agent is their inherent dual effect on cement systems. This is achieved due to the combined steric and electrostatic effects.

The main advantages of PCE water reducing agent are: high strength characteristics;

good external appearance of the product;

high water reduction, economy of cement; small dosage (0.2-1% by weight of cement).

They are environmentally friendly products, harmless to the environment and humans.

PCE water reducing agent are classified as comb polymers (macromolecules composed of a flexible backbone with side chains stitched to it).

The main chain of a PCE water reducing agent molecule usually performs two functions: The PCE water reducing agent molecule is adsorbed by side chains on solid particles and is capable of further intermolecular interactions.

We have synthesized water-soluble surfactant oligomers based on methacrylic acid and polyoxypolyhydroxymethylmethacrylate containing from 10 to 35 polyoxyethylene units in the side chain.

The molar content of methacrylic acid varied from 60 to 80%.

The conditions for the synthesis of such oligomers have been worked out, their composition has been determined, and its compliance with the loading recipe has been shown.

The water solubility and surface activity of the synthesized oligomers were studied.

The dependence of the surface activity on the composition of the oligomer, as well as on the chain length of the polyxyethylene radical, has been established.

The tests of the synthesized polycarboxylate oligomers were carried out using them as superplasticizers in concrete production.

It has been established that the use of such surface-active oligomers makes it possible to obtain self-compacting concrete mixtures that are not inferior in their properties to concrete mixtures made with the use of special plasticizers from leading construction companies.

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