Over the past era, polycarboxylate super-plasticizers (PCE) have developed an instance of the prosperous application of new technology in concrete production. Having begun their method in the production of self-compacting concrete, they slowly penetrated into the arena of precast concrete. Gradually, these additives began to be actively used by manufacturers of ready-mixed concrete and, last but not least, by manufacturers of ready-made concrete products. Due to the specifics of RFE.
Plasticizers allow concrete manufacturers to obtain products with improved characteristics and optimize the production process, both from an economic and environmental point of view. Depending on the chemical construction of the polymers and the attitude of their action, RFE super-plasticizers might be designed specially for specific purposes. Make it possible to obtain a product with high indicators of an early set of strength.
The polymer chain might be enhanced by adapting the electrical charge density to attain maximum (long-lasting) workability of ready-mixed concrete mixes and to fully reveal their properties. In concrete, the RFE super-plasticizer must be compatible with other components of the concrete mix.
The type of filler sand can also affect the effect of the super-plasticizer. Due to the chemical structure, polymer particles are easily embedded in clay layers. If clay is presented as impurities in the sand, it can significantly lose efficiency.
Self-compacting concretes (SCC) and ultra-high-performance concretes (SVEB) can only be obtained using RFE plasticizers. In the production of standard high-strength concretes, additives replace the traditional products used, due to their wide variety and high efficiency.
Polycarboxylate esters – from development to the present
The development of polycarboxylate esters (PCEs) is very closely related to self-compacting concrete (SCC). In the mid-80s, the first projects were launched in Japan using polycarboxylate esters and self-compacting concrete.
The most famous of these are the Tokyo Bay Bridge and the Tokyo Central Towers.
It took about 10 more years before these products appeared in Europe in the mid-90s. Since that time, the process has gone very quickly: the development of new products has provided the market with access to polycarboxylate esters and their use as concrete admixtures.
Due to the special properties of this class of substances, their exceptional efficacy and their diversity, over the next 10 years, Polycarboxylate malaysia esters conquered more than half of the market in the field of plasticizers and super-plasticizers in Western Europe.
At first, the main area of application of RFE super-plasticizers was the production of prefabricated elements. In this case, the decisive role was played by a strong thinning effect, a significant increase in the early strength of concrete when using these products and the use of self-compacting concrete.
The use of appropriate RFE super-plasticizers for the first time has created the possibility of producing concretes with long-term workability of 90 minutes or more with early cure rates, allowing form work to be removed the next day after concrete is placed.
The concrete retains its consistency very well at 20 °C for more than 90 minutes as required; 1 day later, the compressive strength of the concrete was 8.7 N / mm2, i.e. was already sufficient to remove the form work. Compared with the use of conventional joint ventures, it becomes possible to produce concrete at a plant.…