Concrete consisting of a mixture of cement, aggregates, water and possibly other additives, is a synthetic stone. It is produced after the cement paste hardens and cures. Although it has a relatively high compressive strength, it has only a low tensile strength. Because of this, steel reinforcing bars are cast in concrete to take up tensile forces. This is then referred to as reinforced concrete. For anchoring in concrete the best choice is CF920, suitable for cracked and non-cracked concrete, while CF850 is only an option for non- cracked concrete.
PRODUCT PREPARATION: Remove the cap and attach the supplied static-mixing nozzle to the cartridge and load the cartridge into the correct dispensing tool. In case of a foil tube cartridge, cut off the clip before use. For every working interruption longer than the recommended working time as well as for new cartridges, a new static-mixer shall be used.
1. Drill with hammer drill a hole into the base material to the size and embedment depth required by the selected anchor. In case of aborted drill hole: the drill hole shall be filled with mortar.
2a. Attention! Standing water in the bore hole must be removed before cleaning. Starting from the bottom or back of the bore hole, blow the hole clean with compressed air (min. 6 bar) or a hand pump a minimum of four times. If the bore hole ground is not reached an extension shall be used.
The hand-pump can be used for anchor sizes up to bore hole diameter 20mm. For bore holes larger then 20mm or deeper 240mm, compressed air (min. 6 bar) must be used.
2b. Check brush diameter as required and attach the brush to a drilling machine or a battery screwdriver. Brush the hole with an appropriate sized wire brush > db,min a minimum of four times. If the bore hole ground is not reached with the brush, a brush extension shall be used.
2c. Finally blow the hole clean again with compressed air (min. 6 bar) or a hand pump a minimum of four times. If the bore hole ground is not reached an extension shall be used. The hand-pump can be used for anchor sizes up to bore hole diameter 20mm. For bore holes larger than 20mm or deeper 240mm, compressed air (min. 6 bar) must be used.
After cleaning, the bore hole has to be protected against re-contamination in an appropriate way, until dispensing the mortar in the bore hole. If necessary, the cleaning repeated has to be directly before dispensing the mortar. In-flowing water must not contaminate the bore hole again.
3. Prior to inserting the anchor rod into the filled bore hole, the position of the embedment depth shall be marked on the anchor rods.
4. Cut off the foil tube clip before use. Prior to dispensing into the anchor hole, squeeze out separately a minimum of six full strokes, and discard non-unirformly mixed adhesive components until the mortar shows a consistent grey colour.
5. Starting from the bottom or back of the cleaned anchor hole fill the hole up to approximately two-thirds with adhesive. Slowly withdraw the static mixing nozzle as the hole fills to avoid creating air pockets. For embedment larger than 190mm an extension nozzle shall be used. Observe the gel-/working times.
6. Push the threaded rod into the anchor hole while turning slightly to ensure positive distribution of the adhesive until the embedment depth is reached.
The anchor should be free of dirt, grease, oil or other foreign material.
7. Be sure that the anchor is fully seated at the bottom of the hole and that excess mortar is visible at the top of the hole. If these requirements are not maintained, the application has to be renewed. For overhead application the anchor rod should be fixed (e.g. wedges).
8. Allow the adhesive to cure to the specified time prior to applying any load or torque. Do not move or load the anchor until it is fully cured. After full curing, the add-on part can be installed with the max. torque by using a calibrated torque wrench.