Mortars and hydraulic concretes are composed of a binder powder, usually portland cement, and aggregates, which when mixed with water hardens by hydration. To the mixture, various additives and fibers are added, which makes the final product more resistant and durable.
There are different types of repair mortars with different uses for concrete structures. They are used to rebuild lost volumes of concrete, from repair mastics for thin thicknesses to micro concrete for large thicknesses of repair.
The mortar can be applied both to restore the geometry and aesthetics of a concrete element, while avoiding future damages, as well as to restore its structural function.

The mortar can be applied both to restore the geometry and aesthetics of a concrete element, while avoiding future damages, as well as to restore its structural function.
The properties of mortars depend very much on their components and their implementation. If the choice of the mortar is not adequate, this can give many problems, mainly because of the lack of adhesion that can occur between old concrete and new mortar when setting and retractions out of control.

PATHOLOGIES
With the passage of time it has been seen that reinforced concrete is more vulnerable than expected, on the one hand, increasing pollution of the urban and industrial environment produces emissions of gases to the atmosphere, which transform the acidity characteristics of concrete And mortars destroying the passive layer of steel in their armor.

On the other hand, the porous structure of the concrete or mortar itself makes it permeable to the penetration of gases and water, which is the means of penetration of chlorides present in the marine atmosphere or in the runoff of water contaminated with de-icing salts In road structures in cold climates. Also in this case, it is the corrosion of steel reinforcements that will occur. In other cases, the contact of the concrete or mortar with groundwater or soil with high sulfate content can lead to an aggression that produces the development of expansive compounds that destroy the internal structure of the concrete or mortar matrix.

All these aggressions will manifest themselves in symptoms that can be summarized in phenomena of cracking and disintegration. Those that have their origin in the oxidation of the steel of the armors, with its consequent expansion, will manifest with fissures and eventual detachment of the layer of concrete which overlies these reinforcements, given the low resistance of this to resist tensions. The cracking opens direct access routes of the aggressive agents towards the armors, which drastically accelerates the processes of corrosion. The subsequent reduction of the resistant section of the steel can greatly impair the resilient capacity of the structural element. The symptoms that have their origin in the formation of expansive substances in the matrix of concrete are manifested in disaggregation of the material, which start in the outermost exposed and progress inward progressively.

REPAIR MORTARS AND MOUNTING