Concrete, also called concrete, is one of the most common construction materials because of its high resistance to compressive stress (stress to withstand the action of two opposing forces tending to reduce the volume of the object). Usually in the development of concrete are commonly used various additives to improve its technical performance such as sealants, dyes and setting retardants.

Although concrete is very resistant to compressive stress material and performance against the bending stress or tension is not so good and is therefore often used in conjunction with materials such as steel, it is what is called reinforced concrete.

These steel bars running through the concrete are responsible of withstanding the tension forces to the concrete and provide the ability to deform under any load. However if the tensile force exceeds the tensile strength of the concrete will be generated cracks in the concrete.

Once detected cracks in concrete structures, the most convenient is to overcome the causes of concrete cracking as quickly as possible so that the emergence of more serious diseases should be avoided. Three factors to consider in the rehabilitation of cracked concrete structures:

Determining the type of fissure: For rehabilitation of concrete structures to be truly effective you must first determine the type of cracks that affect the concrete structure. For active cracks, also called living fissures (cracks continue to open) it would be appropriate to fill the cracks with elastic synthetic resins that enable greater deformity. In the case of crack inactive (dead or stabilized), the injection of rigid synthetic resins allow completely restore the cracks.

Fissure thickness: Although the rehabilitation of concrete structures with cracks whose thickness ranging between 0.15 mm and 6 mm is possible. by injecting some type of synthetic resin, it should be noted that depending on the thickness, the degree of viscosity of the product to be used is higher or lower. So for cracks with reduced thickness, the product viscosity is lower than in larger cracks. For thicknesses above 6mm it is necessary to use cementitious materials.

Moisture conditions in the cracks: Before rehabilitation of cracks in concrete structures is important to determine not only the presence or absence of moisture in the crack and, in the case of moisture if there is temporary or permanent, but Also if water is present in the cracking pressure or not. For Construcción cracks in moisture is detected which is convenient to use some type of resin that reacts with water (polyurethane resins, acrylic resins flexible and non-expandable with water), so that when the resin contacts water expands sealing the crack and the entry of water into the concrete structure.

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