Epoxy resin injection

30 years of success with Gairesa

The purpose of epoxy resin injection is to restore both the mechanical continuity of a cracked concrete and its watertightness. This is achieved despite the fact that the compressive modulus of elasticity of an epoxy resin is much lower than that of concrete, since the transmission of mechanical stresses changes very little, given the small thickness of the crack in relation to the concrete mass. In addition, the epoxy adhesive will be laterally confined within the crack, which modifies upwards its modulus of elasticity values obtained in standardized tests. BEPOX® 626 is a medium-low viscosity epoxy system manufactured by GAIRESA, free of solvents and non-reactive diluents and free of VOCs. The formulation has been carefully studied for the optimization of parameters such as resistance to aqueous degradation, adhesion under water and resistance to thermal aging.
Epoxy resin injections

Bepox 626

BEPOX® 626 is a product that has been operating in the global resin injection market for more than 30 years, which indicates the quality and efficiency it offers. Its excellent wet/dry characteristics give it a unique value in the industry. BEPOX® 626 was initially introduced into the market for the repair of large concrete structures, primarily for the injection of epoxy resin into cracks in hydroelectric dams. Nowadays, and as a consequence of its excellent balance of properties and curing capacity in such adverse conditions as under water, it is a standard that can be used in the injection of all types of concrete structures, in the manufacture of mortars, composites, fillers, etc. It should be noted that it complies with the CE marking EN 1504-5 as a product for concrete injection, audited by independent bodies.

Performance analysis of BEPOX 626 epoxy system

Mechanical properties

The mechanical properties of BEPOX® 626 evolve rapidly, giving high tensile strengths (40-50% of final values) for a multitude of applications after 24 hours of curing at room temperature. Tensile and deformation test values at different curing times are shown below:

TENSILE STRENGTH

Mortar injection

ELASTIC MODULUS (TENSILE TEST)

Mortar injection

The compressive strength of BEPOX® 626 achieves high values after only 1 day of curing at room temperature, reaching near maximum strengths (80-90%) after 48 hours:

COMPRESSIVE STRENGTH

Mortar injection

ELASTIC MODULUS (COMPRESSIVE TEST)

Mortar injection

Properties after ageing

Accelerated water ageing tests simulate the behaviour that the cured system might have over time. To test the ageing resistance, the cured resin is immersed in water until it reaches equilibrium water absorption, and then its mechanical properties are analysed in a tensile-strain test. After 1 year of immersion, the elastic modulus of BEPOX® 626 remains unchanged. The experience of more than 30 years of successful injection of BEPOX® 626 validates the findings of this accelerated test.

Dams repaired with
BEPOX 626

SAYANO (SIBERIA)

ROSAMARINA (SICILY)

KARAKAYA (TURKEY)

SEFID-RUN (IRAN)

SANTEETLAH (NORTH CAROLINA)

SAN ESTEBAN DEL SIL (OURENSE – SPAIN)

ARLANZÓN (BURGOS – SPAIN)

ATAZAR (MADRID – SPAIN)

RUMEDO (PIRINEOS – SPAIN)

Resin for repairing cracks in concrete

SAYANO (SIBERIA)