The study of adhesion involves several parameters and aims to determine the behavior of the materials involved in the transmission of efforts that develop in the connections. This connection between different materials is of great importance for reinforced concrete, as its functioning depends on the joint work of materials with very different characteristics, such as steel, a material with high ductility and high mechanical strength, and concrete, an extremely fragile material and with low tensile strength. The behavior of a bond depends mainly on the conditions of the interface of the materials involved, as well as the type of interaction that takes place at these interfaces. The most important characteristic of a chemical anchor is the bond portion and the adhesive capacity between the bonding agents. The contact surface between them influences the adhesion capacity, as is the case of roughness, which improves the chemical interaction of the active compounds that act on adhesion.

In this way, poor cleaning of a hole drastically reduces the bonding forces of the system, causing a reduction in the maximum allowable load.

All technical information regarding correct hole cleaning and installation method is in the ETA (European Technical Approval) of the product, and should not be overlooked.

Check if the brush diameter is sufficient, according to the table:

Case Study

The result of a study carried out in the United States identifies that:

- 75% of all installers acquired their knowledge of post-installed anchoring technology from "learning by doing" or from a colleague;

- 25% responded that they were trained by a manufacturer on site or in training;

- 50% knew that the perforation provided by the drill hammer gives greater traction capacity than the smooth drilling wall through diamond crown drilling;

- 19% of installers do not know the influence of cleaning on anchor strength;

- 77% of installers do not clean the holes on site.