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Structural bonding is obtained by means of low viscosity and high viscosity epoxy injection resins. Epoxy resin provides for permanent bonding even of smallest cracks and crack ramifications in concrete and masonry thanks to its high adhesive tensile strength and inherent strength.
WEBAC EP injection resins are compatible with masonry mortar, concrete, steel, foil and cable sheathing. Exception: the resin WEBAC® 4180N is not compatible with foil. WEBAC EP resin is also very resistant to salts, lyes and acids which may damage the building structure.
Structural analysis before the injection:
Please also note when repairing cracks:
This provides information on:
When using epoxy resin in masonry, all loose plaster layers in the area of the injection level must first be removed and all porous joints and defective masonry areas be patched with quick-setting cement. The cracks to be filled must be free of dirt, oil, grease and other separative substances. The crack edges must also be cleaned. When using surface packers for the epoxy injection, EP putty is used for installing the surface packers and for patching the cracks. The surfaces of the structural elements to be patched must be prepared such that sufficient adhesion of the patching (>1.5 N/mm²) is ensured.
The injection pressure during the injection depends on the nature and condition of the building structure. Start the injection by filling the lowest crack areas with epoxy resin first. In case of horizontal cracks, carry out the injection from one side in order to avoid air inclusions. When injecting the last packer check the air vent for emerging resin. A secondary injection should be carried out within the gelling phase of the material (up to approx. 30 min after end of workable life). Please note when applying epoxy resins: the reaction speed is influenced by the temperature of the material and the structural element. Higher temperatures accelerate the reaction speed and lower temperatures slow it down. Only inject pure WEBAC epoxy resin free of residues from cleaning agents or other foreign matter.
The material's workable life may be reduced due to the inherent heat of the injection pump. As soon as the material in the pump's hopper heats up it must either be used up immediately or removed from the pump.