Restauro R2

Restauro R2 is a rapid, ready-for-use, fibre-reinforced, grey-coloured mortar which is based on special cements, selected aggregate, synthetic resins and special additives. Its high thixotropic nature makes it possible to use the mortar for vertical or ceiling applications, both manually and sprayed with a pump, without leaving sag marks. A slight expansion both in the plastic stage and in the post-hardening stage makes it possible to compensate for shrinkage with considerable improvement in the final adhesion and at the same time avoiding the formation of cracks. The high level of water retention reduces the danger of “burns” when applying thin coats (which, however, must be no less than 1 cm) and during critical climatic conditions (high temperatures and strong winds). In this case, suitable precautions must be taken (avoid direct exposure to the sun, mix with cold 1/4 water, apply the product in the cooler hours of the day when it is not too sunny, etc.). Restoration R2 and particularly suitable for rebuilding balcony pediments, steps, parapets, and for reconstructing the concrete cover in concrete structures degraded by carbonation phenomena or other types of deterioration, provided that the structures have not suffered structural failure (in this case use Structural). It can also be advantageously used to regularize defects in reinforced concrete castings, such as gravel nests of a certain consistency and incorrect positioning of reinforcing bars resulting in their surfacing, provided that such regularizations have the thickness of at least 1 cm. According to EN 1504-9, the scope of Restoration R2 is referable to Principles 3 (Concrete Restoration) and 7 (Preservation and Restoration of Passivity). Restauro R2 is a UNI EN 1504-3 R2 class PCC type hydraulic mortar designed for the non-structural repair of concrete.

Instructions for use

Preparation
The background must be clean and highly keyed. Hammer and scrape to remove any loose, disintegrated or damaged parts, until the resistant and clean background is revealed. Clear the protruding reinforcement bars by completely freeing them from the carbonated concrete and sandblast them until they are bare using a hydro-sandblaster or a normal sandblaster. Wet the background thoroughly and let the excess water evaporate or remove it with a sponge. For effective anti-corrosion protection, apply Restauro Ferri to the reinforcement bars and let it harden so that the subsequent applications do not damage the protective layer.

Mixing the product
Then prepare an Restauro R2 based rendering coat mixed with a 1:2 solution of Neoplast Latex and water to form a fluid and apply it to the background prepared as described above. Mix Restauro R2 with approximately 17 – 19% water (approx. 4.25 – 4.75 litres per 25 kg bag), mixing with a mechanical mixer (low RPM drill with mixer blade or mortar mixer) until the mix is even and without lumps. When using small amounts of mix, a trowel can also be used. However, in this case, the amount of water required may be higher. Moreover, this will lead to a decrease in the mechanical and qualitative results (increase in shrinkage and danger of cracking). The mix prepared in this way has a pot-life of approximately 30 minutes under normal conditions (+20 °C). If the temperatures are higher, the pot-life is reduced.

Application
Apply the Restauro R2 mix by hand to the set but not completely hardened rendering coat using a trowel or straight-edge, or by spraying with a plaster gun (due to the rapid setting time, it is necessary to clean the tubes and the nozzle of the gun every time there is a pause in work – this prevents clogging, which is difficult to clear). As a finish, we recommend Restauro Finitura or Monorasante.

Cleaning
The tools used for laying can be cleaned with water before the mortar hardens; afterwards cleaning can be carried out only by mechanical removal.

Storage

Restauro R2 must be stored in a dry, cool and protected area. If closed in the original bags, it can be stored for at least 9 months.

Warnings

• Never mix with other binders such as cement, hydraulic lime, gypsum, etc.
• Do not add water when the mix has already started setting.
• To avoid the formation of cracks in the plastic mortar due to the too rapid evaporation of the mixing water in hot weather, and for the expansive action that cancels the effects of mortar shrinkage to take place, restorations and repairs made with Restauro R2 must be kept moist for at least 48 hours and protected from wind and direct sunlight.
• Do not apply the product at temperatures below +5 °C and above +30 °C.
• Avoid applications less than 1 cm thick, so do not perform “zero” shaving.
• The maximum total thickness is about 10 cm.
• The maximum thickness per coat is about 4-6 cm. For overall thicknesses greater than 3 cm, if the area involved in the intervention is extensive, the carryover must be reinforced with galvanized mesh and this must be protected with at least 1 cm of iron cover. If the total thicknesses are greater than 4 cm, electrowelded mesh can also be used. For localized interventions, e.g. small corners and edges, or restorations on limited surfaces, as well as for thicknesses of less than 3 cm, the use of a reinforcing mesh is not necessary, but in any case the substrate must be strongly roughened to counter expansion. In cases that allow it confine the carryover by means of formwork in order to better counteract the expansive action of the mortar.
• In the case of multiple-coat applications, apply the next coat before the previous one has finished setting, i.e., do not wait more than 90 minutes at +20 °C.
• For laying details (e.g., execution of edges and surface finishes) observe the standards of good technique and the precautions adopted in the application of cement mortars.