Rofluid H concrete Superplastyfikator

The mechanism of action of Rofluid H results from its chemical structure. PCE are compounds with a specific, so-called comb structure that consists of a long main chain and side chains with lengths resulting from the number of repeating units of ethylene oxide and/or propylene. Polymer chains, adsorbing on the surface of cement grains, create a steric hindrance for neighboring grains. The resulting particles with a certain hydrodynamic volume (different depending on the structure of the polymer) will repel each other when they are too close to each other. This hinders the agglomeration of grains, which in turn extends the time of formation of cement hydration products and delays the setting of the concrete mix. In addition, the water trapped in the cement agglomerates is released, which leads to lower consumption of mixing water. The addition of Rofluid H also gives the mix a very good workability, while preventing the segregation of ingredients and creating a coherent concrete.

A small addition of Rofluid H lowers the water/cement ratio, reducing water consumption by up to 35%. This translates directly into the durability of concrete, increasing its early strength (this enables faster demolding of concrete elements) and late strength. Concrete becomes more airtight, its resistance to aggressive substances, frost and abrasion resistance increases.

It should be remembered that the amount of PCE added to the concrete mix depends, among others, on on the type of cement, the method of preparing the mixture, the method of mixing or the ambient temperature. To obtain concrete with standard strengths, it is recommended to use 0.4-1.0% of Rofluid H in relation to the binder mass, while to obtain concrete with high strength and fluidity, it is recommended to use 0.5-1.5% of the product in relation to the binder mass. Rofluid H does not inhibit cement hydration at low temperatures, so it can be used at air temperatures down to -5°C without compromising the consistency of the concrete mix.

The use of Rofluid H is recommended primarily in the production of self-compacting concrete (SCC), large-size concrete elements with the required high strength and high workability, bridge concrete, but also prefabricated elements. It is especially recommended as an efficient mixing water reducer. A concrete mix with an admixture of Rofluid H will gain a very good consistency, extended setting time, and the resulting concrete will have greater compressive strength and tightness.