Water Reducer PCE
Over the past few years, many new additives have been introduced to the market. Of greatest importance was the new additive, which was a Water reducer PCE, or polycarboxylate-based superplasticizer.
This is a significant advance over naphthalene and melamine-based plasticizers. Also, a new class of additives called “Rheology Controlling Additives” (RCA) has recently been commercialized.
The introduction of SCC in the US happened about ten years ago. As a type of concrete, on the one hand, it proved to be very promising, and on the other hand, it created many problems in terms of producing a reliable and homogeneous product. But recent developments have overcome these troublesome problems, making SCC more popular with contractors.
Here is a description of some of the ways in which recent developments have improved this product used by contractors.
User Oriented Water Reducer PCE
The main benefit of polycarboxylates, 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 a Water reducer PCE and then design molecules to achieve just that.
Up to this point, scientists have been experimenting with materials to track their performance. But over time it became known that many factors affect how polycarboxylates affect the behavior of concrete, and admixture companies have worked hard to solve all the problems. As a result, many changes were announced.
Basically, the change is about recognizing that concrete and cement use conditions vary from region to region, so polycarboxylate additives must be designed to provide the same performance for each region. New achievements include:
Longer shelf life—concrete that stays liquid or doesn’t sag longer;
Development of greater strength in the early stages of curing
A product that does not give additional entrainment of air into the concrete
An additive that functions the same in all regions of the country
All Water reducer PCE based on polycarboxylate have the same problems. These admixtures can, by their nature, create undesirable volumetric air entrainment in the concrete—air that is not needed to provide freeze and thaw resistance.
The trick is to limit the ability of the admixtures to create additional air volumes and still allow admixtures that cause air entrainment in the concrete to create the desired structure with air voids. Products currently on the market are capable of providing this effect.
Polycarboxylate additive is a plasticizing additive, but improved. With the use of this additive, concrete is more durable. The formation of micropores with air in concrete and mortar is much less than with the usual method of mixing. The strength of the product increases by 14% – 18%.
Physically, this additive is a comb copolymer. Its molecular weight is (15-50) × 10 3.
The additive consists of carboxylate and alkoxyoligoalkylene oxide groups. The structure resembles a “wave crest”. It can also be called a Water reducer PCE, of the highest quality.
The use of this additive allows concrete or mortar not to spread. During storage, the finished product will not shrink. Stratification, when the heavy components of sand and gravel fall into the lower part of the solution, and water and cement rise into its upper part, will not occur.
The economic effect of using a polycarboxylate additive is to reduce the amount of cement required for the production of mixtures. Using the right dosage, you can get a product of high strength at the output.
The combined interaction of the chemical structure and the mechanical action of this additive makes it possible to achieve the best electrostatic repulsion. Due to this, the polycarboxylate additive has risen one step higher from its predecessors. Even with a small consumption of this additive, the properties of the finished product do not deteriorate.
Most importantly, polycarboxylate additives are safe. And their use is not limited by sanitary standards and environmental tolerances, unlike Water reducer PCE based on melamine-formaldehyde or naphthalene-formaldehyde polymers.
What is the Most Common G
Polycarboxylate Water Red