Rofluid T is an aqueous solution of polycarboxylate ether (PCE) of brown-yellow colour, low viscosity and 50% dry substance. PCEs are new generation concrete admixtures, compounds with a specific structure (the so-called comb structure), consisting of a long main chain and side chains with lengths depending on the number of repeating units of ethylene oxide and / or propylene.
The product is used as a high performance batched water reducer for the production of concrete with high strength and high liquefaction. It is also fully compatible with other products of the Rofluid line.
The chemical structure of Rofluid T determines its mechanism of action. Rofluid P particles adsorb the surface of cement grains and create a steric hindrance for neighbouring grains. The resulting particles, having a specific hydrodynamic volume (different depending on the structure of the polymer), when too close to each other will repel each other. Agglomeration of cement grains is then difficult, which in turn extends the time it takes to produce its hydration products and delays the setting of the concrete mix. In addition, water trapped in cement agglomerates is released, which leads to less consumption of batched water. The addition of Rofluid T also allows for very good workability of the mix, while preventing segregation of ingredients and creating uniform concrete. Reduces the phenomenon of "bleeding" (water discharge).
The addition of Rofluid T reduces the consumption of batched water by up to 35%. This has a direct impact on the durability of concrete, increasing its early strength (which allows faster demoulding of concrete elements) and late strength. Concrete tightness is also improved, i.e. its resistance to aggressive substances and frost, as well as resistance to abrasion. It should be remembered that the amount of PCE added to the concrete mix depends, among others on the type of cement, the method of preparing the mix, the method of mixing or ambient temperature.
To obtain concrete with standard strength it is recommended to use 0.4-1.0% Rofluid T in relation to the weight of the binder, while for obtaining high-strength concrete with high fluidity, the admixture addition should be slightly higher, 0.5-1.5% product to the cement binder mass. Rofluid T works both at low and high ambient temperatures. Rofluid P does not inhibit cement hydration at low temperatures, so it can be used at an air temperature of -5 ° C without compromising the consistency of the concrete mix. Its dispersion and retention properties are also maintained at high temperatures and high humidity.
The use of Rofluid T is recommended primarily in the production of self-compacting concrete (SCC), large-size concrete elements with the required high strength and high workability, in particular for the production of bridge elements with the required strengths over 50N / mm2.